ClickHouse/CHANGELOG.md

### Table of Contents
**[ClickHouse release v22.8, 2022-08-18](#228)**<br/>
**[ClickHouse release v22.7, 2022-07-21](#227)**<br/>
**[ClickHouse release v22.6, 2022-06-16](#226)**<br/>
**[ClickHouse release v22.5, 2022-05-19](#225)**<br/>
**[ClickHouse release v22.4, 2022-04-20](#224)**<br/>
**[ClickHouse release v22.3-lts, 2022-03-17](#223)**<br/>
**[ClickHouse release v22.2, 2022-02-17](#222)**<br/>
**[ClickHouse release v22.1, 2022-01-18](#221)**<br/>
**[Changelog for 2021](https://clickhouse.com/docs/en/whats-new/changelog/2021/)**<br/>


### <a id="228"></a> ClickHouse release 22.8, 2022-08-18

#### Backward Incompatible Change
* Extended range of `Date32` and `DateTime64` to support dates from the year 1900 to 2299. In previous versions, the supported interval was only from the year 1925 to 2283. The implementation is using the proleptic Gregorian calendar (which is conformant with [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601):2004 (clause 3.2.1 The Gregorian calendar)) instead of accounting for historical transitions from the Julian to the Gregorian calendar. This change affects implementation-specific behavior for out-of-range arguments. E.g. if in previous versions the value of `1899-01-01` was clamped to `1925-01-01`, in the new version it will be clamped to `1900-01-01`. It changes the behavior of rounding with `toStartOfInterval` if you pass `INTERVAL 3 QUARTER` up to one quarter because the intervals are counted from an implementation-specific point of time. Closes [#28216](https://github.com/ClickHouse/ClickHouse/issues/28216), improves [#38393](https://github.com/ClickHouse/ClickHouse/issues/38393). [#39425](https://github.com/ClickHouse/ClickHouse/pull/39425) ([Roman Vasin](https://github.com/rvasin)).
* Now, all relevant dictionary sources respect `remote_url_allow_hosts` setting. It was already done for HTTP, Cassandra, Redis. Added ClickHouse, MongoDB, MySQL, PostgreSQL. Host is checked only for dictionaries created from DDL. [#39184](https://github.com/ClickHouse/ClickHouse/pull/39184) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Make the remote filesystem cache composable, allow not to evict certain files (regarding idx, mrk, ..), delete old cache version. Now it is possible to configure cache over Azure blob storage disk, over Local disk, over StaticWeb disk, etc. This PR is marked backward incompatible because cache configuration changes and in order for cache to work need to update the config file. Old cache will still be used with new configuration. The server will startup fine with the old cache configuration. Closes https://github.com/ClickHouse/ClickHouse/issues/36140. Closes https://github.com/ClickHouse/ClickHouse/issues/37889. ([Kseniia Sumarokova](https://github.com/kssenii)). [#36171](https://github.com/ClickHouse/ClickHouse/pull/36171))

#### New Feature
* Query parameters can be set in interactive mode as `SET param_abc = 'def'` and transferred via the native protocol as settings. [#39906](https://github.com/ClickHouse/ClickHouse/pull/39906) ([Nikita Taranov](https://github.com/nickitat)).
* Quota key can be set in the native protocol ([Yakov Olkhovsky](https://github.com/ClickHouse/ClickHouse/pull/39874)).
* Added a setting `exact_rows_before_limit` (0/1). When enabled, ClickHouse will provide exact value for `rows_before_limit_at_least` statistic, but with the cost that the data before limit will have to be read completely. This closes [#6613](https://github.com/ClickHouse/ClickHouse/issues/6613). [#25333](https://github.com/ClickHouse/ClickHouse/pull/25333) ([kevin wan](https://github.com/MaxWk)).
* Added support for parallel distributed insert select with `s3Cluster` table function into tables with `Distributed` and `Replicated` engine [#34670](https://github.com/ClickHouse/ClickHouse/issues/34670). [#39107](https://github.com/ClickHouse/ClickHouse/pull/39107) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Add new settings to control schema inference from text formats: - `input_format_try_infer_dates` - try infer dates from strings. - `input_format_try_infer_datetimes` - try infer datetimes from strings. - `input_format_try_infer_integers` - try infer `Int64` instead of `Float64`. - `input_format_json_try_infer_numbers_from_strings` - try infer numbers from json strings in JSON formats. [#39186](https://github.com/ClickHouse/ClickHouse/pull/39186) ([Kruglov Pavel](https://github.com/Avogar)).
* An option to provide JSON formatted log output. The purpose is to allow easier ingestion and query in log analysis tools. [#39277](https://github.com/ClickHouse/ClickHouse/pull/39277) ([Mallik Hassan](https://github.com/SadiHassan)).
* Add function `nowInBlock` which allows getting the current time during long-running and continuous queries. Closes [#39522](https://github.com/ClickHouse/ClickHouse/issues/39522). Notes: there are no functions `now64InBlock` neither `todayInBlock`. [#39533](https://github.com/ClickHouse/ClickHouse/pull/39533) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Add ability to specify settings for an `executable()` table function. [#39681](https://github.com/ClickHouse/ClickHouse/pull/39681) ([Constantine Peresypkin](https://github.com/pkit)).
* Implemented automatic conversion of database engine from `Ordinary` to `Atomic`. Create empty `convert_ordinary_to_atomic` file in `flags` directory and all `Ordinary` databases will be converted automatically on next server start. Resolves [#39546](https://github.com/ClickHouse/ClickHouse/issues/39546). [#39933](https://github.com/ClickHouse/ClickHouse/pull/39933) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Support `SELECT ... INTO OUTFILE '...' AND STDOUT`. [#37490](https://github.com/ClickHouse/ClickHouse/issues/37490). [#39054](https://github.com/ClickHouse/ClickHouse/pull/39054) ([SmitaRKulkarni](https://github.com/SmitaRKulkarni)).
* Add formats `PrettyMonoBlock`, `PrettyNoEscapesMonoBlock`, `PrettyCompactNoEscapes`, `PrettyCompactNoEscapesMonoBlock`, `PrettySpaceNoEscapes`, `PrettySpaceMonoBlock`, `PrettySpaceNoEscapesMonoBlock`. [#39646](https://github.com/ClickHouse/ClickHouse/pull/39646) ([Kruglov Pavel](https://github.com/Avogar)).
* Add new setting schema_inference_hints that allows to specify structure hints in schema inference for specific columns. Closes [#39569](https://github.com/ClickHouse/ClickHouse/issues/39569). [#40068](https://github.com/ClickHouse/ClickHouse/pull/40068) ([Kruglov Pavel](https://github.com/Avogar)).

#### Experimental Feature
* Support SQL standard DELETE FROM syntax on merge tree tables and lightweight delete implementation for merge tree families. [#37893](https://github.com/ClickHouse/ClickHouse/pull/37893) ([Jianmei Zhang](https://github.com/zhangjmruc)) ([Alexander Gololobov](https://github.com/davenger)). Note: this new feature does not make ClickHouse an HTAP DBMS.

#### Performance Improvement
* Improved memory usage during memory efficient merging of aggregation results. [#39429](https://github.com/ClickHouse/ClickHouse/pull/39429) ([Nikita Taranov](https://github.com/nickitat)).
* Added concurrency control logic to limit total number of concurrent threads created by queries. [#37558](https://github.com/ClickHouse/ClickHouse/pull/37558) ([Sergei Trifonov](https://github.com/serxa)). Add `concurrent_threads_soft_limit parameter` to increase performance in case of high QPS by means of limiting total number of threads for all queries. [#37285](https://github.com/ClickHouse/ClickHouse/pull/37285) ([Roman Vasin](https://github.com/rvasin)).
* Add `SLRU` cache policy for uncompressed cache and marks cache. ([Kseniia Sumarokova](https://github.com/kssenii)). [#34651](https://github.com/ClickHouse/ClickHouse/pull/34651) ([alexX512](https://github.com/alexX512)). Decoupling local cache function and cache algorithm [#38048](https://github.com/ClickHouse/ClickHouse/pull/38048) ([Han Shukai](https://github.com/KinderRiven)). 
* Intel® In-Memory Analytics Accelerator (Intel® IAA) is a hardware accelerator available in the upcoming generation of Intel® Xeon® Scalable processors ("Sapphire Rapids"). Its goal is to speed up common operations in analytics like data (de)compression and filtering. ClickHouse gained the new "DeflateQpl" compression codec which utilizes the Intel® IAA offloading technology to provide a high-performance DEFLATE implementation. The codec uses the [Intel® Query Processing Library (QPL)](https://github.com/intel/qpl) which abstracts access to the hardware accelerator, respectively to a software fallback in case the hardware accelerator is not available. DEFLATE provides in general higher compression rates than ClickHouse's LZ4 default codec, and as a result, offers less disk I/O and lower main memory consumption. [#36654](https://github.com/ClickHouse/ClickHouse/pull/36654) ([jasperzhu](https://github.com/jinjunzh)). [#39494](https://github.com/ClickHouse/ClickHouse/pull/39494) ([Robert Schulze](https://github.com/rschu1ze)).
* `DISTINCT` in order with `ORDER BY`: Deduce way to sort based on input stream sort description. Skip sorting if input stream is already sorted. [#38719](https://github.com/ClickHouse/ClickHouse/pull/38719) ([Igor Nikonov](https://github.com/devcrafter)). Improve memory usage (significantly) and query execution time + use `DistinctSortedChunkTransform` for final distinct when `DISTINCT` columns match `ORDER BY` columns, but rename to `DistinctSortedStreamTransform` in `EXPLAIN PIPELINE` → this improves memory usage significantly + remove unnecessary allocations in hot loop in `DistinctSortedChunkTransform`. [#39432](https://github.com/ClickHouse/ClickHouse/pull/39432) ([Igor Nikonov](https://github.com/devcrafter)). Use `DistinctSortedTransform` only when sort description is applicable to DISTINCT columns, otherwise fall back to ordinary DISTINCT implementation + it allows making less checks during `DistinctSortedTransform` execution. [#39528](https://github.com/ClickHouse/ClickHouse/pull/39528) ([Igor Nikonov](https://github.com/devcrafter)). Fix: `DistinctSortedTransform` didn't take advantage of sorting. It never cleared HashSet since clearing_columns were detected incorrectly (always empty). So, it basically worked as ordinary `DISTINCT` (`DistinctTransform`). The fix reduces memory usage significantly. [#39538](https://github.com/ClickHouse/ClickHouse/pull/39538) ([Igor Nikonov](https://github.com/devcrafter)).
* Use local node as first priority to get structure of remote table when executing `cluster` and similar table functions. [#39440](https://github.com/ClickHouse/ClickHouse/pull/39440) ([Mingliang Pan](https://github.com/liangliangpan)).
* Optimize filtering by numeric columns with AVX512VBMI2 compress store. [#39633](https://github.com/ClickHouse/ClickHouse/pull/39633) ([Guo Wangyang](https://github.com/guowangy)). For systems with AVX512 VBMI2, this PR improves performance by ca. 6% for SSB benchmark queries queries 3.1, 3.2 and 3.3 (SF=100). Tested on Intel Icelake Xeon 8380 * 2 socket. [#40033](https://github.com/ClickHouse/ClickHouse/pull/40033) ([Robert Schulze](https://github.com/rschu1ze)).
* Optimize index analysis with functional expressions in multi-thread scenario. [#39812](https://github.com/ClickHouse/ClickHouse/pull/39812) ([Guo Wangyang](https://github.com/guowangy)).
* Optimizations for complex queries: Don't visit the AST for UDFs if none are registered. [#40069](https://github.com/ClickHouse/ClickHouse/pull/40069) ([Raúl Marín](https://github.com/Algunenano)). Optimize CurrentMemoryTracker alloc and free. [#40078](https://github.com/ClickHouse/ClickHouse/pull/40078) ([Raúl Marín](https://github.com/Algunenano)).
* Improved Base58 encoding/decoding. [#39292](https://github.com/ClickHouse/ClickHouse/pull/39292) ([Andrey Zvonov](https://github.com/zvonand)).
* Improve bytes to bits mask transform for SSE/AVX/AVX512. [#39586](https://github.com/ClickHouse/ClickHouse/pull/39586) ([Guo Wangyang](https://github.com/guowangy)).

#### Improvement
* Normalize `AggregateFunction` types and state representations because optimizations like [#35788](https://github.com/ClickHouse/ClickHouse/pull/35788) will treat `count(not null columns)` as `count()`, which might confuses distributed interpreters with the following error : `Conversion from AggregateFunction(count) to AggregateFunction(count, Int64) is not supported`. [#39420](https://github.com/ClickHouse/ClickHouse/pull/39420) ([Amos Bird](https://github.com/amosbird)). The functions with identical states can be used in materialized views interchangeably.
* Rework and simplify the `system.backups` table, remove the `internal` column, allow user to set the ID of operation, add columns `num_files`, `uncompressed_size`, `compressed_size`, `start_time`, `end_time`. [#39503](https://github.com/ClickHouse/ClickHouse/pull/39503) ([Vitaly Baranov](https://github.com/vitlibar)).
* Improved structure of DDL query result table for `Replicated` database (separate columns with shard and replica name, more clear status) - `CREATE TABLE ... ON CLUSTER` queries can be normalized on initiator first if `distributed_ddl_entry_format_version` is set to 3 (default value). It means that `ON CLUSTER` queries may not work if initiator does not belong to the cluster that specified in query. Fixes [#37318](https://github.com/ClickHouse/ClickHouse/issues/37318), [#39500](https://github.com/ClickHouse/ClickHouse/issues/39500) - Ignore `ON CLUSTER` clause if database is `Replicated` and cluster name equals to database name. Related to [#35570](https://github.com/ClickHouse/ClickHouse/issues/35570) - Miscellaneous minor fixes for `Replicated` database engine - Check metadata consistency when starting up `Replicated` database, start replica recovery in case of mismatch of local metadata and metadata in Keeper. Resolves [#24880](https://github.com/ClickHouse/ClickHouse/issues/24880). [#37198](https://github.com/ClickHouse/ClickHouse/pull/37198) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Add result_rows and result_bytes to progress reports (`X-ClickHouse-Summary`). [#39567](https://github.com/ClickHouse/ClickHouse/pull/39567) ([Raúl Marín](https://github.com/Algunenano)).
* Improve primary key analysis for MergeTree. [#25563](https://github.com/ClickHouse/ClickHouse/pull/25563) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* `timeSlots` now works with DateTime64; subsecond duration and slot size available when working with DateTime64. [#37951](https://github.com/ClickHouse/ClickHouse/pull/37951) ([Andrey Zvonov](https://github.com/zvonand)).
* Added support of `LEFT SEMI` and `LEFT ANTI` direct join with `EmbeddedRocksDB` tables. [#38956](https://github.com/ClickHouse/ClickHouse/pull/38956) ([Vladimir C](https://github.com/vdimir)).
* Add profile events for fsync operations. [#39179](https://github.com/ClickHouse/ClickHouse/pull/39179) ([Azat Khuzhin](https://github.com/azat)).
* Add the second argument to the ordinary function `file(path[, default])`, which function returns in the case when a file does not exists. [#39218](https://github.com/ClickHouse/ClickHouse/pull/39218) ([Nikolay Degterinsky](https://github.com/evillique)).
* Some small fixes for reading via http, allow to retry partial content in case if 200 OK. [#39244](https://github.com/ClickHouse/ClickHouse/pull/39244) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Support queries `CREATE TEMPORARY TABLE ... (<list of columns>) AS ...`. [#39462](https://github.com/ClickHouse/ClickHouse/pull/39462) ([Kruglov Pavel](https://github.com/Avogar)).
* Add support of `!`/`*` (exclamation/asterisk) in custom TLDs (`cutToFirstSignificantSubdomainCustom()`/`cutToFirstSignificantSubdomainCustomWithWWW()`/`firstSignificantSubdomainCustom()`). [#39496](https://github.com/ClickHouse/ClickHouse/pull/39496) ([Azat Khuzhin](https://github.com/azat)).
* Add support for TLS connections to NATS. Implements [#39525](https://github.com/ClickHouse/ClickHouse/issues/39525). [#39527](https://github.com/ClickHouse/ClickHouse/pull/39527) ([Constantine Peresypkin](https://github.com/pkit)).
* `clickhouse-obfuscator` (a tool for database obfuscation for testing and load generation) now has the new `--save` and `--load` parameters to work with pre-trained models. This closes [#39534](https://github.com/ClickHouse/ClickHouse/issues/39534). [#39541](https://github.com/ClickHouse/ClickHouse/pull/39541) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix incorrect behavior of log rotation during restart. [#39558](https://github.com/ClickHouse/ClickHouse/pull/39558) ([Nikolay Degterinsky](https://github.com/evillique)).
* Fix building aggregate projections when external aggregation is on. Mark as improvement because the case is rare and there exists easy workaround to fix it via changing settings. This fixes [#39667](https://github.com/ClickHouse/ClickHouse/issues/39667) . [#39671](https://github.com/ClickHouse/ClickHouse/pull/39671) ([Amos Bird](https://github.com/amosbird)).
* Allow to execute hash functions with arguments of type `Map`. [#39685](https://github.com/ClickHouse/ClickHouse/pull/39685) ([Anton Popov](https://github.com/CurtizJ)).
* Add a configuration parameter to hide addresses in stack traces. It may improve security a little but generally, it is harmful and should not be used. [#39690](https://github.com/ClickHouse/ClickHouse/pull/39690) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Change the prefix size of AggregateFunctionDistinct to make sure nested function data memory segment is aligned. [#39696](https://github.com/ClickHouse/ClickHouse/pull/39696) ([Pxl](https://github.com/BiteTheDDDDt)).
* Properly escape credentials passed to the `clickhouse-diagnostic` tool. [#39707](https://github.com/ClickHouse/ClickHouse/pull/39707) ([Dale McDiarmid](https://github.com/gingerwizard)).
* ClickHouse Keeper improvement: create a snapshot on exit. It can be controlled with the config `keeper_server.create_snapshot_on_exit`, `true` by default. [#39755](https://github.com/ClickHouse/ClickHouse/pull/39755) ([Antonio Andelic](https://github.com/antonio2368)).
* Support primary key analysis for `row_policy_filter` and `additional_filter`. It also helps fix issues like [#37454](https://github.com/ClickHouse/ClickHouse/issues/37454) . [#39826](https://github.com/ClickHouse/ClickHouse/pull/39826) ([Amos Bird](https://github.com/amosbird)).
* Fix two usability issues in Play UI: - it was non-pixel-perfect on iPad due to parasitic border radius and margins; - the progress indication did not display after the first query. This closes [#39957](https://github.com/ClickHouse/ClickHouse/issues/39957). This closes [#39960](https://github.com/ClickHouse/ClickHouse/issues/39960). [#39961](https://github.com/ClickHouse/ClickHouse/pull/39961) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Play UI: add row numbers; add cell selection on click; add hysteresis for table cells. [#39962](https://github.com/ClickHouse/ClickHouse/pull/39962) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Play UI: recognize tab key in textarea, but at the same time don't mess up with tab navigation. [#40053](https://github.com/ClickHouse/ClickHouse/pull/40053) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* The client will show server-side elapsed time. This is important for the performance comparison of ClickHouse services in remote datacenters. This closes [#38070](https://github.com/ClickHouse/ClickHouse/issues/38070). See also [this](https://github.com/ClickHouse/ClickBench/blob/main/hardware/benchmark-cloud.sh#L37) for motivation. [#39968](https://github.com/ClickHouse/ClickHouse/pull/39968) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Adds `parseDateTime64BestEffortUS`, `parseDateTime64BestEffortUSOrNull`, `parseDateTime64BestEffortUSOrZero` functions, closing [#37492](https://github.com/ClickHouse/ClickHouse/issues/37492). [#40015](https://github.com/ClickHouse/ClickHouse/pull/40015) ([Tanya Bragin](https://github.com/tbragin)).
* Extend the `system.processors_profile_log` with more information such as input rows. [#40121](https://github.com/ClickHouse/ClickHouse/pull/40121) ([Amos Bird](https://github.com/amosbird)).
* Display server-side time in `clickhouse-benchmark` by default if it is available (since ClickHouse version 22.8). This is needed to correctly compare the performance of clouds. This behavior can be changed with the new `--client-side-time` command line option. Change the `--randomize` command line option from `--randomize 1` to the form without argument. [#40193](https://github.com/ClickHouse/ClickHouse/pull/40193) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Add counters (ProfileEvents) for cases when query complexity limitation has been set and has reached (a separate counter for `overflow_mode` = `break` and `throw`). For example, if you have set up `max_rows_to_read` with `read_overflow_mode = 'break'`, looking at the value of `OverflowBreak` counter will allow distinguishing incomplete results. [#40205](https://github.com/ClickHouse/ClickHouse/pull/40205) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix memory accounting in case of "Memory limit exceeded" errors (previously [peak] memory usage was takes failed allocations into account). [#40249](https://github.com/ClickHouse/ClickHouse/pull/40249) ([Azat Khuzhin](https://github.com/azat)).
* Add metrics for filesystem cache: `FilesystemCacheSize` and `FilesystemCacheElements`. [#40260](https://github.com/ClickHouse/ClickHouse/pull/40260) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Support hadoop secure RPC transfer (hadoop.rpc.protection=privacy and hadoop.rpc.protection=integrity). [#39411](https://github.com/ClickHouse/ClickHouse/pull/39411) ([michael1589](https://github.com/michael1589)).
* Avoid continuously growing memory consumption of pattern cache when using functions multi(Fuzzy)Match(Any|AllIndices|AnyIndex)(). [#40264](https://github.com/ClickHouse/ClickHouse/pull/40264) ([Robert Schulze](https://github.com/rschu1ze)).
* Add cache for schema inference for file/s3/hdfs/url table functions. Now, schema inference will be performed only on the first query to the file, all subsequent queries to the same file will use the schema from cache if data wasn't changed. Add system table system.schema_inference_cache with all current schemas in cache and system queries SYSTEM DROP SCHEMA CACHE [FOR FILE/S3/HDFS/URL] to drop schemas from cache. [#38286](https://github.com/ClickHouse/ClickHouse/pull/38286) ([Kruglov Pavel](https://github.com/Avogar)).
* Add support for LARGE_BINARY/LARGE_STRING with Arrow (Closes [#32401](https://github.com/ClickHouse/ClickHouse/issues/32401)). [#40293](https://github.com/ClickHouse/ClickHouse/pull/40293) ([Josh Taylor](https://github.com/joshuataylor)).

#### Build/Testing/Packaging Improvement
* [ClickFiddle](https://fiddle.clickhouse.com/): A new tool for testing ClickHouse versions in read/write mode (**Igor Baliuk**).
* ClickHouse binary is made self-extracting [#35775](https://github.com/ClickHouse/ClickHouse/pull/35775) ([Yakov Olkhovskiy, Arthur Filatenkov](https://github.com/yakov-olkhovskiy)).
* Update tzdata to 2022b to support the new timezone changes. See https://github.com/google/cctz/pull/226. Chile's 2022 DST start is delayed from September 4 to September 11. Iran plans to stop observing DST permanently, after it falls back on 2022-09-21. There are corrections of the historical time zone of Asia/Tehran in the year 1977: Iran adopted standard time in 1935, not 1946. In 1977 it observed DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 transition was on 05-27, not 03-21 (https://data.iana.org/time-zones/tzdb/NEWS). ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Former packages used to install systemd.service file to `/etc`. The files there are marked as `conf` and are not cleaned out, and not updated automatically. This PR cleans them out. [#39323](https://github.com/ClickHouse/ClickHouse/pull/39323) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Ensure LSan is effective. [#39430](https://github.com/ClickHouse/ClickHouse/pull/39430) ([Azat Khuzhin](https://github.com/azat)).
* TSAN has issues with clang-14 (https://github.com/google/sanitizers/issues/1552, https://github.com/google/sanitizers/issues/1540), so here we build the TSAN binaries with clang-15. [#39450](https://github.com/ClickHouse/ClickHouse/pull/39450) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Remove the option to build ClickHouse tools as separate executable programs. This fixes [#37847](https://github.com/ClickHouse/ClickHouse/issues/37847). [#39520](https://github.com/ClickHouse/ClickHouse/pull/39520) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Small preparations for build on s390x (which is big-endian). [#39627](https://github.com/ClickHouse/ClickHouse/pull/39627) ([Harry Lee](https://github.com/HarryLeeIBM)). [#39656](https://github.com/ClickHouse/ClickHouse/pull/39656) ([Harry Lee](https://github.com/HarryLeeIBM)). Fixed Endian issue in BitHelpers for s390x. [#39656](https://github.com/ClickHouse/ClickHouse/pull/39656) ([Harry Lee](https://github.com/HarryLeeIBM)). Implement a piece of code related to SipHash for s390x architecture (which is not supported by ClickHouse). [#39732](https://github.com/ClickHouse/ClickHouse/pull/39732) ([Harry Lee](https://github.com/HarryLeeIBM)). Fixed an Endian issue in Coordination snapshot code for s390x architecture (which is not supported by ClickHouse). [#39931](https://github.com/ClickHouse/ClickHouse/pull/39931) ([Harry Lee](https://github.com/HarryLeeIBM)). Fixed Endian issues in Codec code for s390x architecture (which is not supported by ClickHouse). [#40008](https://github.com/ClickHouse/ClickHouse/pull/40008) ([Harry Lee](https://github.com/HarryLeeIBM)). Fixed Endian issues in reading/writing BigEndian binary data in ReadHelpers and WriteHelpers code for s390x architecture (which is not supported by ClickHouse). [#40179](https://github.com/ClickHouse/ClickHouse/pull/40179) ([Harry Lee](https://github.com/HarryLeeIBM)).
* Support build with `clang-16` (trunk). This closes [#39949](https://github.com/ClickHouse/ClickHouse/issues/39949). [#40181](https://github.com/ClickHouse/ClickHouse/pull/40181) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Prepare RISC-V 64 build to run in CI. This is for [#40141](https://github.com/ClickHouse/ClickHouse/issues/40141). [#40197](https://github.com/ClickHouse/ClickHouse/pull/40197) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Simplified function registration macro interface (`FUNCTION_REGISTER*`) to eliminate the step to add and call an extern function in the registerFunctions.cpp, it also makes incremental builds of a new function faster. [#38615](https://github.com/ClickHouse/ClickHouse/pull/38615) ([Li Yin](https://github.com/liyinsg)).
* Docker: Now entrypoint.sh in docker image creates and executes chown for all folders it found in config for multidisk setup [#17717](https://github.com/ClickHouse/ClickHouse/issues/17717). [#39121](https://github.com/ClickHouse/ClickHouse/pull/39121) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).

#### Bug Fix
* Fix possible segfault in `CapnProto` input format. This bug was found and send through ClickHouse bug-bounty [program](https://github.com/ClickHouse/ClickHouse/issues/38986) by *kiojj*. [#40241](https://github.com/ClickHouse/ClickHouse/pull/40241) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix a very rare case of incorrect behavior of array subscript operator. This closes [#28720](https://github.com/ClickHouse/ClickHouse/issues/28720). [#40185](https://github.com/ClickHouse/ClickHouse/pull/40185) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix insufficient argument check for encryption functions (found by query fuzzer). This closes [#39987](https://github.com/ClickHouse/ClickHouse/issues/39987). [#40194](https://github.com/ClickHouse/ClickHouse/pull/40194) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix the case when the order of columns can be incorrect if the `IN` operator is used with a table with `ENGINE = Set` containing multiple columns. This fixes [#13014](https://github.com/ClickHouse/ClickHouse/issues/13014). [#40225](https://github.com/ClickHouse/ClickHouse/pull/40225) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix seeking while reading from encrypted disk. This PR fixes [#38381](https://github.com/ClickHouse/ClickHouse/issues/38381). [#39687](https://github.com/ClickHouse/ClickHouse/pull/39687) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix duplicate columns in join plan. Finally, solve [#26809](https://github.com/ClickHouse/ClickHouse/issues/26809). [#40009](https://github.com/ClickHouse/ClickHouse/pull/40009) ([Vladimir C](https://github.com/vdimir)).
* Fixed query hanging for SELECT with ORDER BY WITH FILL with different date/time types. [#37849](https://github.com/ClickHouse/ClickHouse/pull/37849) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Fix ORDER BY that matches projections ORDER BY (before it simply returns unsorted result). [#38725](https://github.com/ClickHouse/ClickHouse/pull/38725) ([Azat Khuzhin](https://github.com/azat)).
* Do not optimise functions in GROUP BY statements if they shadow one of the table columns or expressions. Fixes [#37032](https://github.com/ClickHouse/ClickHouse/issues/37032). [#39103](https://github.com/ClickHouse/ClickHouse/pull/39103) ([Anton Kozlov](https://github.com/tonickkozlov)).
* Fix wrong table name in logs after RENAME TABLE. This fixes [#38018](https://github.com/ClickHouse/ClickHouse/issues/38018). [#39227](https://github.com/ClickHouse/ClickHouse/pull/39227) ([Amos Bird](https://github.com/amosbird)).
* Fix positional arguments in case of columns pruning when optimising the query. Closes [#38433](https://github.com/ClickHouse/ClickHouse/issues/38433). [#39293](https://github.com/ClickHouse/ClickHouse/pull/39293) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix bug in schema inference in case of empty messages in Protobuf/CapnProto formats that allowed to create column with empty `Tuple` type. Closes [#39051](https://github.com/ClickHouse/ClickHouse/issues/39051) Add 2 new settings `input_format_{protobuf/capnproto}_skip_fields_with_unsupported_types_in_schema_inference` that allow to skip fields with unsupported types while schema inference for Protobuf and CapnProto formats. [#39357](https://github.com/ClickHouse/ClickHouse/pull/39357) ([Kruglov Pavel](https://github.com/Avogar)).
* (Window View is an experimental feature) Fix segmentation fault on `CREATE WINDOW VIEW .. ON CLUSTER ... INNER`. Closes [#39363](https://github.com/ClickHouse/ClickHouse/issues/39363). [#39384](https://github.com/ClickHouse/ClickHouse/pull/39384) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix WriteBuffer finalize when cancelling insert into function (in previous versions it may leat to std::terminate). [#39458](https://github.com/ClickHouse/ClickHouse/pull/39458) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix storing of columns of type `Object` in sparse serialization. [#39464](https://github.com/ClickHouse/ClickHouse/pull/39464) ([Anton Popov](https://github.com/CurtizJ)).
* Fix possible "Not found column in block" exception when using projections. This closes [#39469](https://github.com/ClickHouse/ClickHouse/issues/39469). [#39470](https://github.com/ClickHouse/ClickHouse/pull/39470) ([小路](https://github.com/nicelulu)).
* Fix exception on race between DROP and INSERT with materialized views. [#39477](https://github.com/ClickHouse/ClickHouse/pull/39477) ([Azat Khuzhin](https://github.com/azat)).
* A bug in Apache Avro library: fix data race and possible heap-buffer-overflow in Avro format. Closes [#39094](https://github.com/ClickHouse/ClickHouse/issues/39094) Closes [#33652](https://github.com/ClickHouse/ClickHouse/issues/33652). [#39498](https://github.com/ClickHouse/ClickHouse/pull/39498) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix rare bug in asynchronous reading (with setting `local_filesystem_read_method='pread_threadpool'`) with enabled `O_DIRECT` (enabled by setting `min_bytes_to_use_direct_io`). [#39506](https://github.com/ClickHouse/ClickHouse/pull/39506) ([Anton Popov](https://github.com/CurtizJ)).
* (only on FreeBSD) Fixes "Code: 49. DB::Exception: FunctionFactory: the function name '' is not unique. (LOGICAL_ERROR)" observed on FreeBSD when starting clickhouse. [#39551](https://github.com/ClickHouse/ClickHouse/pull/39551) ([Alexander Gololobov](https://github.com/davenger)).
* Fix bug with the recently introduced "maxsplit" argument for `splitByChar`, which was not working correctly. [#39552](https://github.com/ClickHouse/ClickHouse/pull/39552) ([filimonov](https://github.com/filimonov)).
* Fix bug in ASOF JOIN with `enable_optimize_predicate_expression`, close [#37813](https://github.com/ClickHouse/ClickHouse/issues/37813). [#39556](https://github.com/ClickHouse/ClickHouse/pull/39556) ([Vladimir C](https://github.com/vdimir)).
* Fixed `CREATE/DROP INDEX` query with `ON CLUSTER` or `Replicated` database and `ReplicatedMergeTree`. It used to be executed on all replicas (causing error or DDL queue stuck). Fixes [#39511](https://github.com/ClickHouse/ClickHouse/issues/39511). [#39565](https://github.com/ClickHouse/ClickHouse/pull/39565) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Fix "column not found" error for push down with join, close [#39505](https://github.com/ClickHouse/ClickHouse/issues/39505). [#39575](https://github.com/ClickHouse/ClickHouse/pull/39575) ([Vladimir C](https://github.com/vdimir)).
* Fix the wrong `REGEXP_REPLACE` alias. This fixes https://github.com/ClickHouse/ClickBench/issues/9. [#39592](https://github.com/ClickHouse/ClickHouse/pull/39592) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fixed point of origin for exponential decay window functions to the last value in window. Previously, decay was calculated by formula `exp((t - curr_row_t) / decay_length)`, which is incorrect when right boundary of window is not `CURRENT ROW`. It was changed to: `exp((t - last_row_t) / decay_length)`. There is no change in results for windows with `ROWS BETWEEN (smth) AND CURRENT ROW`. [#39593](https://github.com/ClickHouse/ClickHouse/pull/39593) ([Vladimir Chebotaryov](https://github.com/quickhouse)).
* Fix Decimal division overflow, which can be detected based on operands scale. [#39600](https://github.com/ClickHouse/ClickHouse/pull/39600) ([Andrey Zvonov](https://github.com/zvonand)).
* Fix settings `output_format_arrow_string_as_string` and `output_format_arrow_low_cardinality_as_dictionary` work in combination. Closes [#39624](https://github.com/ClickHouse/ClickHouse/issues/39624). [#39647](https://github.com/ClickHouse/ClickHouse/pull/39647) ([Kruglov Pavel](https://github.com/Avogar)).
* Fixed a bug in default database resolution in distributed table reads. [#39674](https://github.com/ClickHouse/ClickHouse/pull/39674) ([Anton Kozlov](https://github.com/tonickkozlov)).
* (Only with the obsolete Ordinary databases) Select might read data of dropped table if cache for mmap IO is used and database engine is Ordinary and new tables was created with the same name as dropped one had. It's fixed. [#39708](https://github.com/ClickHouse/ClickHouse/pull/39708) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Fix possible error `Invalid column type for ColumnUnique::insertRangeFrom. Expected String, got ColumnLowCardinality` Fixes [#38460](https://github.com/ClickHouse/ClickHouse/issues/38460). [#39716](https://github.com/ClickHouse/ClickHouse/pull/39716) ([Arthur Passos](https://github.com/arthurpassos)).
* Field names in the `meta` section of JSON format were erroneously double escaped. This closes [#39693](https://github.com/ClickHouse/ClickHouse/issues/39693). [#39747](https://github.com/ClickHouse/ClickHouse/pull/39747) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix wrong index analysis with tuples and operator `IN`, which could lead to wrong query result. [#39752](https://github.com/ClickHouse/ClickHouse/pull/39752) ([Anton Popov](https://github.com/CurtizJ)).
* Fix `EmbeddedRocksDB` tables filtering by key using params. [#39757](https://github.com/ClickHouse/ClickHouse/pull/39757) ([Antonio Andelic](https://github.com/antonio2368)).
* Fix error `Invalid number of columns in chunk pushed to OutputPort` which was caused by ARRAY JOIN optimization. Fixes [#39164](https://github.com/ClickHouse/ClickHouse/issues/39164). [#39799](https://github.com/ClickHouse/ClickHouse/pull/39799) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* A workaround for a bug in Linux kernel. Fix `CANNOT_READ_ALL_DATA` exception with `local_filesystem_read_method=pread_threadpool`. This bug affected only Linux kernel version 5.9 and 5.10 according to [man](https://manpages.debian.org/testing/manpages-dev/preadv2.2.en.html#BUGS). [#39800](https://github.com/ClickHouse/ClickHouse/pull/39800) ([Anton Popov](https://github.com/CurtizJ)).
* (Only on NFS) Fix broken NFS mkdir for root-squashed volumes. [#39898](https://github.com/ClickHouse/ClickHouse/pull/39898) ([Constantine Peresypkin](https://github.com/pkit)).
* Remove dictionaries from prometheus metrics on DETACH/DROP. [#39926](https://github.com/ClickHouse/ClickHouse/pull/39926) ([Azat Khuzhin](https://github.com/azat)).
* Fix read of StorageFile with virtual columns. Closes [#39907](https://github.com/ClickHouse/ClickHouse/issues/39907). [#39943](https://github.com/ClickHouse/ClickHouse/pull/39943) ([flynn](https://github.com/ucasfl)).
* Fix big memory usage during fetches. Fixes [#39915](https://github.com/ClickHouse/ClickHouse/issues/39915). [#39990](https://github.com/ClickHouse/ClickHouse/pull/39990) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* (experimental feature) Fix `hashId` crash and salt parameter not being used. [#40002](https://github.com/ClickHouse/ClickHouse/pull/40002) ([Raúl Marín](https://github.com/Algunenano)).
* `EXCEPT` and `INTERSECT` operators may lead to crash if a specific combination of constant and non-constant columns were used. [#40020](https://github.com/ClickHouse/ClickHouse/pull/40020) ([Duc Canh Le](https://github.com/canhld94)).
* Fixed "Part directory doesn't exist" and "`tmp_<part_name>` ... No such file or directory" errors during too slow INSERT or too long merge/mutation. Also fixed issue that may cause some replication queue entries to stuck without any errors or warnings in logs if previous attempt to fetch part failed, but `tmp-fetch_<part_name>` directory was not cleaned up. [#40031](https://github.com/ClickHouse/ClickHouse/pull/40031) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Fix rare cases of parsing of arrays of tuples in format `Values`. [#40034](https://github.com/ClickHouse/ClickHouse/pull/40034) ([Anton Popov](https://github.com/CurtizJ)).
* Fixes ArrowColumn format Dictionary(X) & Dictionary(Nullable(X)) conversion to ClickHouse LowCardinality(X) & LowCardinality(Nullable(X)) respectively. [#40037](https://github.com/ClickHouse/ClickHouse/pull/40037) ([Arthur Passos](https://github.com/arthurpassos)).
* Fix potential deadlock in writing to S3 during task scheduling failure. [#40070](https://github.com/ClickHouse/ClickHouse/pull/40070) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix bug in collectFilesToSkip() by adding correct file extension (.idx or idx2) for indexes to be recalculated, avoid wrong hard links. Fixed [#39896](https://github.com/ClickHouse/ClickHouse/issues/39896). [#40095](https://github.com/ClickHouse/ClickHouse/pull/40095) ([Jianmei Zhang](https://github.com/zhangjmruc)).
* A fix for reverse DNS resolution. [#40134](https://github.com/ClickHouse/ClickHouse/pull/40134) ([Arthur Passos](https://github.com/arthurpassos)).
* Fix unexpected result `arrayDifference` of `Array(UInt32). [#40211](https://github.com/ClickHouse/ClickHouse/pull/40211) ([Duc Canh Le](https://github.com/canhld94)).


### <a id="227"></a> ClickHouse release 22.7, 2022-07-21

#### Upgrade Notes
* Enable setting `enable_positional_arguments` by default. It allows queries like `SELECT ... ORDER BY 1, 2` where 1, 2 are the references to the select clause. If you need to return the old behavior, disable this setting. [#38204](https://github.com/ClickHouse/ClickHouse/pull/38204) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Disable `format_csv_allow_single_quotes` by default. See [#37096](https://github.com/ClickHouse/ClickHouse/issues/37096). ([Kruglov Pavel](https://github.com/Avogar)).
* `Ordinary` database engine and old storage definition syntax for `*MergeTree` tables are deprecated. By default it's not possible to create new databases with `Ordinary` engine. If `system` database has `Ordinary` engine it will be automatically converted to `Atomic` on server startup. There are settings to keep old behavior (`allow_deprecated_database_ordinary` and `allow_deprecated_syntax_for_merge_tree`), but these settings may be removed in future releases. [#38335](https://github.com/ClickHouse/ClickHouse/pull/38335) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Force rewriting comma join to inner by default (set default value `cross_to_inner_join_rewrite = 2`). To have old behavior set `cross_to_inner_join_rewrite = 1`. [#39326](https://github.com/ClickHouse/ClickHouse/pull/39326) ([Vladimir C](https://github.com/vdimir)). If you will face any incompatibilities, you can turn this setting back.

#### New Feature
* Support expressions with window functions. Closes [#19857](https://github.com/ClickHouse/ClickHouse/issues/19857). [#37848](https://github.com/ClickHouse/ClickHouse/pull/37848) ([Dmitry Novik](https://github.com/novikd)).
* Add new `direct` join algorithm for `EmbeddedRocksDB` tables, see [#33582](https://github.com/ClickHouse/ClickHouse/issues/33582). [#35363](https://github.com/ClickHouse/ClickHouse/pull/35363) ([Vladimir C](https://github.com/vdimir)).
* Added full sorting merge join algorithm. [#35796](https://github.com/ClickHouse/ClickHouse/pull/35796) ([Vladimir C](https://github.com/vdimir)).
* Implement NATS table engine, which allows to pub/sub to NATS. Closes [#32388](https://github.com/ClickHouse/ClickHouse/issues/32388). [#37171](https://github.com/ClickHouse/ClickHouse/pull/37171) ([tchepavel](https://github.com/tchepavel)). ([Kseniia Sumarokova](https://github.com/kssenii))
* Implement table function `mongodb`. Allow writes into `MongoDB` storage / table function. [#37213](https://github.com/ClickHouse/ClickHouse/pull/37213) ([aaapetrenko](https://github.com/aaapetrenko)). ([Kseniia Sumarokova](https://github.com/kssenii))
* Add `SQLInsert` output format. Closes [#38441](https://github.com/ClickHouse/ClickHouse/issues/38441). [#38477](https://github.com/ClickHouse/ClickHouse/pull/38477) ([Kruglov Pavel](https://github.com/Avogar)).
* Introduced settings `additional_table_filters`. Using this setting, you can specify additional filtering condition for a table which will be applied directly after reading. Example: `select number, x, y from (select number from system.numbers limit 5) f any left join (select x, y from table_1) s on f.number = s.x settings additional_table_filters={'system.numbers : 'number != 3', 'table_1' : 'x != 2'}`. Introduced setting `additional_result_filter` which specifies additional filtering condition for query result. Closes [#37918](https://github.com/ClickHouse/ClickHouse/issues/37918). [#38475](https://github.com/ClickHouse/ClickHouse/pull/38475) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Add `compatibility` setting and `system.settings_changes` system table that contains information about changes in settings through ClickHouse versions. Closes [#35972](https://github.com/ClickHouse/ClickHouse/issues/35972). [#38957](https://github.com/ClickHouse/ClickHouse/pull/38957) ([Kruglov Pavel](https://github.com/Avogar)).
* Add functions `translate(string, from_string, to_string)` and `translateUTF8(string, from_string, to_string)`. It translates some characters to another. [#38935](https://github.com/ClickHouse/ClickHouse/pull/38935) ([Nikolay Degterinsky](https://github.com/evillique)).
* Support `parseTimeDelta` function. It can be used like ` ;-+,:` can be used as separators, eg. `1yr-2mo`, `2m:6s`: `SELECT parseTimeDelta('1yr-2mo-4w + 12 days, 3 hours : 1 minute ; 33 seconds')`. [#39071](https://github.com/ClickHouse/ClickHouse/pull/39071) ([jiahui-97](https://github.com/jiahui-97)).
* Added `CREATE TABLE ... EMPTY AS SELECT` query. It automatically deduces table structure from the SELECT query, but does not fill the table after creation. Resolves [#38049](https://github.com/ClickHouse/ClickHouse/issues/38049). [#38272](https://github.com/ClickHouse/ClickHouse/pull/38272) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Added options to limit IO operations with remote storage: `max_remote_read_network_bandwidth_for_server` and `max_remote_write_network_bandwidth_for_server`. [#39095](https://github.com/ClickHouse/ClickHouse/pull/39095) ([Sergei Trifonov](https://github.com/serxa)).
* Add `group_by_use_nulls` setting to make aggregation key columns nullable in the case of ROLLUP, CUBE and GROUPING SETS. Closes [#37359](https://github.com/ClickHouse/ClickHouse/issues/37359). [#38642](https://github.com/ClickHouse/ClickHouse/pull/38642) ([Dmitry Novik](https://github.com/novikd)).
* Add the ability to specify compression level during data export. [#38907](https://github.com/ClickHouse/ClickHouse/pull/38907) ([Nikolay Degterinsky](https://github.com/evillique)).
* Add an option to require explicit grants to SELECT from the `system` database. Details: [#38970](https://github.com/ClickHouse/ClickHouse/pull/38970) ([Vitaly Baranov](https://github.com/vitlibar)).
* Functions `multiMatchAny`, `multiMatchAnyIndex`, `multiMatchAllIndices` and their fuzzy variants now accept non-const pattern array argument. [#38485](https://github.com/ClickHouse/ClickHouse/pull/38485) ([Robert Schulze](https://github.com/rschu1ze)). SQL function `multiSearchAllPositions` now accepts non-const needle arguments. [#39167](https://github.com/ClickHouse/ClickHouse/pull/39167) ([Robert Schulze](https://github.com/rschu1ze)).
* Add a setting `zstd_window_log_max` to configure max memory usage on zstd decoding when importing external files. Closes [#35693](https://github.com/ClickHouse/ClickHouse/issues/35693). [#37015](https://github.com/ClickHouse/ClickHouse/pull/37015) ([wuxiaobai24](https://github.com/wuxiaobai24)).
* Add `send_logs_source_regexp` setting. Send server text logs with specified regexp to match log source name. Empty means all sources. [#39161](https://github.com/ClickHouse/ClickHouse/pull/39161) ([Amos Bird](https://github.com/amosbird)).
* Support `ALTER` for `Hive` tables. [#38214](https://github.com/ClickHouse/ClickHouse/pull/38214) ([lgbo](https://github.com/lgbo-ustc)).
* Support `isNullable` function. This function checks whether it's argument is nullable and return 1 or 0. Closes [#38611](https://github.com/ClickHouse/ClickHouse/issues/38611). [#38841](https://github.com/ClickHouse/ClickHouse/pull/38841) ([lokax](https://github.com/lokax)).
* Added functions for base58 encoding/decoding. [#38159](https://github.com/ClickHouse/ClickHouse/pull/38159) ([Andrey Zvonov](https://github.com/zvonand)).
* Add chart visualization to Play UI. [#38197](https://github.com/ClickHouse/ClickHouse/pull/38197) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Added L2 Squared distance and norm functions for both arrays and tuples. [#38545](https://github.com/ClickHouse/ClickHouse/pull/38545) ([Julian Gilyadov](https://github.com/israelg99)).
* Add ability to pass HTTP headers to the `url` table function / storage via SQL. Closes [#37897](https://github.com/ClickHouse/ClickHouse/issues/37897). [#38176](https://github.com/ClickHouse/ClickHouse/pull/38176) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Add `clickhouse-diagnostics` binary to the packages. [#38647](https://github.com/ClickHouse/ClickHouse/pull/38647) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).

#### Experimental Feature
* Adds new setting `implicit_transaction` to run standalone queries inside a transaction. It handles both creation and closing (via COMMIT if the query succeeded or ROLLBACK if it didn't) of the transaction automatically. [#38344](https://github.com/ClickHouse/ClickHouse/pull/38344) ([Raúl Marín](https://github.com/Algunenano)).

#### Performance Improvement
* Distinct optimization for sorted columns. Use specialized distinct transformation in case input stream is sorted by column(s) in distinct. Optimization can be applied to pre-distinct, final distinct, or both. Initial implementation by @dimarub2000. [#37803](https://github.com/ClickHouse/ClickHouse/pull/37803) ([Igor Nikonov](https://github.com/devcrafter)).
* Improve performance of `ORDER BY`, `MergeTree` merges, window functions using batch version of `BinaryHeap`. [#38022](https://github.com/ClickHouse/ClickHouse/pull/38022) ([Maksim Kita](https://github.com/kitaisreal)).
* More parallel execution for queries with `FINAL` [#36396](https://github.com/ClickHouse/ClickHouse/pull/36396) ([Nikita Taranov](https://github.com/nickitat)).
* Fix significant join performance regression which was introduced in [#35616](https://github.com/ClickHouse/ClickHouse/pull/35616). It's interesting that common join queries such as ssb queries have been 10 times slower for almost 3 months while no one complains. [#38052](https://github.com/ClickHouse/ClickHouse/pull/38052) ([Amos Bird](https://github.com/amosbird)).
* Migrate from the Intel hyperscan library to vectorscan, this speeds up many string matching on non-x86 platforms. [#38171](https://github.com/ClickHouse/ClickHouse/pull/38171) ([Robert Schulze](https://github.com/rschu1ze)).
* Increased parallelism of query plan steps executed after aggregation. [#38295](https://github.com/ClickHouse/ClickHouse/pull/38295) ([Nikita Taranov](https://github.com/nickitat)).
* Improve performance of insertion to columns of type `JSON`. [#38320](https://github.com/ClickHouse/ClickHouse/pull/38320) ([Anton Popov](https://github.com/CurtizJ)).
* Optimized insertion and lookups in the HashTable. [#38413](https://github.com/ClickHouse/ClickHouse/pull/38413) ([Nikita Taranov](https://github.com/nickitat)).
* Fix performance degradation from [#32493](https://github.com/ClickHouse/ClickHouse/issues/32493). [#38417](https://github.com/ClickHouse/ClickHouse/pull/38417) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Improve performance of joining with numeric columns using SIMD instructions. [#37235](https://github.com/ClickHouse/ClickHouse/pull/37235) ([zzachimed](https://github.com/zzachimed)). [#38565](https://github.com/ClickHouse/ClickHouse/pull/38565) ([Maksim Kita](https://github.com/kitaisreal)). 
* Norm and Distance functions for arrays speed up 1.2-2 times. [#38740](https://github.com/ClickHouse/ClickHouse/pull/38740) ([Alexander Gololobov](https://github.com/davenger)).
* Add AVX-512 VBMI optimized `copyOverlap32Shuffle` for LZ4 decompression. In other words, LZ4 decompression performance is improved. [#37891](https://github.com/ClickHouse/ClickHouse/pull/37891) ([Guo Wangyang](https://github.com/guowangy)).
* `ORDER BY (a, b)` will use all the same benefits as `ORDER BY a, b`. [#38873](https://github.com/ClickHouse/ClickHouse/pull/38873) ([Igor Nikonov](https://github.com/devcrafter)).
* Align branches within a 32B boundary to make benchmark more stable. [#38988](https://github.com/ClickHouse/ClickHouse/pull/38988) ([Guo Wangyang](https://github.com/guowangy)). It improves performance 1..2% on average for Intel.
* Executable UDF, executable dictionaries, and Executable tables will avoid wasting one second during wait for subprocess termination. [#38929](https://github.com/ClickHouse/ClickHouse/pull/38929) ([Constantine Peresypkin](https://github.com/pkit)).
* Optimize accesses to `system.stack_trace` table if not all columns are selected. [#39177](https://github.com/ClickHouse/ClickHouse/pull/39177) ([Azat Khuzhin](https://github.com/azat)).
* Improve isNullable/isConstant/isNull/isNotNull performance for LowCardinality argument. [#39192](https://github.com/ClickHouse/ClickHouse/pull/39192) ([Kruglov Pavel](https://github.com/Avogar)).
* Optimized processing of ORDER BY in window functions. [#34632](https://github.com/ClickHouse/ClickHouse/pull/34632) ([Vladimir Chebotarev](https://github.com/excitoon)).
* The table `system.asynchronous_metric_log` is further optimized for storage space. This closes [#38134](https://github.com/ClickHouse/ClickHouse/issues/38134). See the [YouTube video](https://www.youtube.com/watch?v=0fSp9SF8N8A). [#38428](https://github.com/ClickHouse/ClickHouse/pull/38428) ([Alexey Milovidov](https://github.com/alexey-milovidov)).

#### Improvement
* Support SQL standard CREATE INDEX and DROP INDEX syntax. [#35166](https://github.com/ClickHouse/ClickHouse/pull/35166) ([Jianmei Zhang](https://github.com/zhangjmruc)).
* Send profile events for INSERT queries (previously only SELECT was supported). [#37391](https://github.com/ClickHouse/ClickHouse/pull/37391) ([Azat Khuzhin](https://github.com/azat)).
* Implement in order aggregation (`optimize_aggregation_in_order`) for fully materialized projections. [#37469](https://github.com/ClickHouse/ClickHouse/pull/37469) ([Azat Khuzhin](https://github.com/azat)).
* Remove subprocess run for kerberos initialization. Added new integration test. Closes [#27651](https://github.com/ClickHouse/ClickHouse/issues/27651). [#38105](https://github.com/ClickHouse/ClickHouse/pull/38105) ([Roman Vasin](https://github.com/rvasin)).
* * Add setting `multiple_joins_try_to_keep_original_names` to not rewrite identifier name on multiple JOINs rewrite, close [#34697](https://github.com/ClickHouse/ClickHouse/issues/34697). [#38149](https://github.com/ClickHouse/ClickHouse/pull/38149) ([Vladimir C](https://github.com/vdimir)).
* Improved trace-visualizer UX. [#38169](https://github.com/ClickHouse/ClickHouse/pull/38169) ([Sergei Trifonov](https://github.com/serxa)).
* Enable stack trace collection and query profiler for AArch64. [#38181](https://github.com/ClickHouse/ClickHouse/pull/38181) ([Maksim Kita](https://github.com/kitaisreal)).
* Do not skip symlinks in `user_defined` directory during SQL user defined functions loading. Closes [#38042](https://github.com/ClickHouse/ClickHouse/issues/38042). [#38184](https://github.com/ClickHouse/ClickHouse/pull/38184) ([Maksim Kita](https://github.com/kitaisreal)).
* Added background cleanup of subdirectories in `store/`. In some cases clickhouse-server might left garbage subdirectories in `store/` (for example, on unsuccessful table creation) and those dirs were never been removed. Fixes [#33710](https://github.com/ClickHouse/ClickHouse/issues/33710). [#38265](https://github.com/ClickHouse/ClickHouse/pull/38265) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Add `DESCRIBE CACHE` query to show cache settings from config. Add `SHOW CACHES` query to show available filesystem caches list. [#38279](https://github.com/ClickHouse/ClickHouse/pull/38279) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Add access check for `system drop filesystem cache`. Support ON CLUSTER. [#38319](https://github.com/ClickHouse/ClickHouse/pull/38319) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix PostgreSQL database engine incompatibility on upgrade from 21.3 to 22.3. Closes [#36659](https://github.com/ClickHouse/ClickHouse/issues/36659). [#38369](https://github.com/ClickHouse/ClickHouse/pull/38369) ([Kseniia Sumarokova](https://github.com/kssenii)).
* `filesystemAvailable` and similar functions now work in `clickhouse-local`. This closes [#38423](https://github.com/ClickHouse/ClickHouse/issues/38423). [#38424](https://github.com/ClickHouse/ClickHouse/pull/38424) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Add `revision` function. [#38555](https://github.com/ClickHouse/ClickHouse/pull/38555) ([Azat Khuzhin](https://github.com/azat)).
* Fix GCS via proxy tunnel usage. [#38726](https://github.com/ClickHouse/ClickHouse/pull/38726) ([Azat Khuzhin](https://github.com/azat)).
* Support `\i file` in clickhouse client / local (similar to psql \i). [#38813](https://github.com/ClickHouse/ClickHouse/pull/38813) ([Kseniia Sumarokova](https://github.com/kssenii)).
* New option `optimize = 1` in `EXPLAIN AST`. If enabled, it shows AST after it's rewritten, otherwise AST of original query. Disabled by default. [#38910](https://github.com/ClickHouse/ClickHouse/pull/38910) ([Igor Nikonov](https://github.com/devcrafter)).
* Allow trailing comma in columns list. closes [#38425](https://github.com/ClickHouse/ClickHouse/issues/38425). [#38440](https://github.com/ClickHouse/ClickHouse/pull/38440) ([chen](https://github.com/xiedeyantu)).
* Bugfixes and performance improvements for `parallel_hash` JOIN method. [#37648](https://github.com/ClickHouse/ClickHouse/pull/37648) ([Vladimir C](https://github.com/vdimir)).
* Support hadoop secure RPC transfer (hadoop.rpc.protection=privacy and hadoop.rpc.protection=integrity). [#37852](https://github.com/ClickHouse/ClickHouse/pull/37852) ([Peng Liu](https://github.com/michael1589)).
* Add struct type support in `StorageHive`. [#38118](https://github.com/ClickHouse/ClickHouse/pull/38118) ([lgbo](https://github.com/lgbo-ustc)).
* S3 single objects are now removed with `RemoveObjectRequest`. Implement compatibility with  GCP which did not allow to use `removeFileIfExists` effectively breaking approximately half of `remove` functionality. Automatic detection for `DeleteObjects` S3 API, that is not supported by GCS. This will allow to use GCS without explicit `support_batch_delete=0` in configuration. [#37882](https://github.com/ClickHouse/ClickHouse/pull/37882) ([Vladimir Chebotarev](https://github.com/excitoon)).
* Expose basic ClickHouse Keeper related monitoring data (via ProfileEvents and CurrentMetrics). [#38072](https://github.com/ClickHouse/ClickHouse/pull/38072) ([lingpeng0314](https://github.com/lingpeng0314)).
* Support `auto_close` option for PostgreSQL engine connection. Closes [#31486](https://github.com/ClickHouse/ClickHouse/issues/31486). [#38363](https://github.com/ClickHouse/ClickHouse/pull/38363) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Allow `NULL` modifier in columns declaration for table functions. [#38816](https://github.com/ClickHouse/ClickHouse/pull/38816) ([Kruglov Pavel](https://github.com/Avogar)).
* Deactivate `mutations_finalizing_task` before shutdown to avoid benign `TABLE_IS_READ_ONLY` errors during shutdown. [#38851](https://github.com/ClickHouse/ClickHouse/pull/38851) ([Raúl Marín](https://github.com/Algunenano)).
* Eliminate unnecessary waiting of SELECT queries after ALTER queries in presence of INSERT queries if you use deprecated Ordinary databases. [#38864](https://github.com/ClickHouse/ClickHouse/pull/38864) ([Azat Khuzhin](https://github.com/azat)).
* New option `rewrite` in `EXPLAIN AST`. If enabled, it shows AST after it's rewritten, otherwise AST of original query. Disabled by default. [#38910](https://github.com/ClickHouse/ClickHouse/pull/38910) ([Igor Nikonov](https://github.com/devcrafter)).
* Stop reporting Zookeeper "Node exists" exceptions in system.errors when they are expected. [#38961](https://github.com/ClickHouse/ClickHouse/pull/38961) ([Raúl Marín](https://github.com/Algunenano)).
* `clickhouse-keeper`: add support for real-time digest calculation and verification. It is disabled by default. [#37555](https://github.com/ClickHouse/ClickHouse/pull/37555) ([Antonio Andelic](https://github.com/antonio2368)).
* Allow to specify globs `* or {expr1, expr2, expr3}` inside a key for `clickhouse-extract-from-config` tool. [#38966](https://github.com/ClickHouse/ClickHouse/pull/38966) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* clearOldLogs: Don't report KEEPER_EXCEPTION on concurrent deletes. [#39016](https://github.com/ClickHouse/ClickHouse/pull/39016) ([Raúl Marín](https://github.com/Algunenano)).
* clickhouse-keeper improvement: persist meta-information about keeper servers to disk. [#39069](https://github.com/ClickHouse/ClickHouse/pull/39069) ([Antonio Andelic](https://github.com/antonio2368)). This will make it easier to operate if you shutdown or restart all keeper nodes at the same time.
* Continue without exception when running out of disk space when using filesystem cache. [#39106](https://github.com/ClickHouse/ClickHouse/pull/39106) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Handling SIGTERM signals from k8s. [#39130](https://github.com/ClickHouse/ClickHouse/pull/39130) ([Timur Solodovnikov](https://github.com/tsolodov)).
* Add `merge_algorithm` column (Undecided, Horizontal, Vertical) to system.part_log. [#39181](https://github.com/ClickHouse/ClickHouse/pull/39181) ([Azat Khuzhin](https://github.com/azat)).
* Don't increment a counter in `system.errors` when the disk is not rotational. [#39216](https://github.com/ClickHouse/ClickHouse/pull/39216) ([Raúl Marín](https://github.com/Algunenano)).
* The metric `result_bytes` for `INSERT` queries in `system.query_log` shows number of bytes inserted. Previously value was incorrect and stored the same value as `result_rows`. [#39225](https://github.com/ClickHouse/ClickHouse/pull/39225) ([Ilya Yatsishin](https://github.com/qoega)).
* The CPU usage metric in clickhouse-client will be displayed in a better way. Fixes [#38756](https://github.com/ClickHouse/ClickHouse/issues/38756). [#39280](https://github.com/ClickHouse/ClickHouse/pull/39280) ([Sergei Trifonov](https://github.com/serxa)).
* Rethrow exception on filesystem cache initialization on server startup, better error message. [#39386](https://github.com/ClickHouse/ClickHouse/pull/39386) ([Kseniia Sumarokova](https://github.com/kssenii)).
* OpenTelemetry now collects traces without Processors spans by default (there are too many). To enable Processors spans collection `opentelemetry_trace_processors` setting. [#39170](https://github.com/ClickHouse/ClickHouse/pull/39170) ([Ilya Yatsishin](https://github.com/qoega)).
* Functions `multiMatch[Fuzzy](AllIndices/Any/AnyIndex)` - don't throw a logical error if the needle argument is empty. [#39012](https://github.com/ClickHouse/ClickHouse/pull/39012) ([Robert Schulze](https://github.com/rschu1ze)).
* Allow to declare `RabbitMQ` queue without default arguments `x-max-length` and `x-overflow`. [#39259](https://github.com/ClickHouse/ClickHouse/pull/39259) ([rnbondarenko](https://github.com/rnbondarenko)).

#### Build/Testing/Packaging Improvement
* Apply Clang Thread Safety Analysis (TSA) annotations to ClickHouse. [#38068](https://github.com/ClickHouse/ClickHouse/pull/38068) ([Robert Schulze](https://github.com/rschu1ze)).
* Adapt universal installation script for FreeBSD. [#39302](https://github.com/ClickHouse/ClickHouse/pull/39302) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Preparation for building on `s390x` platform. [#39193](https://github.com/ClickHouse/ClickHouse/pull/39193) ([Harry Lee](https://github.com/HarryLeeIBM)).
* Fix a bug in `jemalloc` library [#38757](https://github.com/ClickHouse/ClickHouse/pull/38757) ([Azat Khuzhin](https://github.com/azat)).
* Hardware benchmark now has support for automatic results uploading. [#38427](https://github.com/ClickHouse/ClickHouse/pull/38427) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* System table "system.licenses" is now correctly populated on Mac (Darwin). [#38294](https://github.com/ClickHouse/ClickHouse/pull/38294) ([Robert Schulze](https://github.com/rschu1ze)).
* Change `all|noarch` packages to architecture-dependent - Fix some documentation for it - Push aarch64|arm64 packages to artifactory and release assets - Fixes [#36443](https://github.com/ClickHouse/ClickHouse/issues/36443). [#38580](https://github.com/ClickHouse/ClickHouse/pull/38580) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).

#### Bug Fix (user-visible misbehavior in official stable or prestable release)
* Fix rounding for `Decimal128/Decimal256` with more than 19-digits long scale. [#38027](https://github.com/ClickHouse/ClickHouse/pull/38027) ([Igor Nikonov](https://github.com/devcrafter)).
* Fixed crash caused by data race in storage `Hive` (integration table engine). [#38887](https://github.com/ClickHouse/ClickHouse/pull/38887) ([lgbo](https://github.com/lgbo-ustc)).
* Fix crash when executing GRANT ALL ON *.* with ON CLUSTER. It was broken in https://github.com/ClickHouse/ClickHouse/pull/35767. This closes [#38618](https://github.com/ClickHouse/ClickHouse/issues/38618). [#38674](https://github.com/ClickHouse/ClickHouse/pull/38674) ([Vitaly Baranov](https://github.com/vitlibar)).
* Correct glob expansion in case of `{0..10}` forms. Fixes [#38498](https://github.com/ClickHouse/ClickHouse/issues/38498) Current Implementation is similar to what shell does mentiond by @rschu1ze [here](https://github.com/ClickHouse/ClickHouse/pull/38502#issuecomment-1169057723). [#38502](https://github.com/ClickHouse/ClickHouse/pull/38502) ([Heena Bansal](https://github.com/HeenaBansal2009)).
* Fix crash for `mapUpdate`, `mapFilter` functions when using with constant map argument. Closes [#38547](https://github.com/ClickHouse/ClickHouse/issues/38547). [#38553](https://github.com/ClickHouse/ClickHouse/pull/38553) ([hexiaoting](https://github.com/hexiaoting)).
* Fix `toHour` monotonicity information for query optimization which can lead to incorrect query result (incorrect index analysis). This fixes [#38333](https://github.com/ClickHouse/ClickHouse/issues/38333). [#38675](https://github.com/ClickHouse/ClickHouse/pull/38675) ([Amos Bird](https://github.com/amosbird)).
* Fix checking whether s3 storage support parallel writes. It resulted in s3 parallel writes not working. [#38792](https://github.com/ClickHouse/ClickHouse/pull/38792) ([chen](https://github.com/xiedeyantu)).
* Fix s3 seekable reads with parallel read buffer. (Affected memory usage during query). Closes [#38258](https://github.com/ClickHouse/ClickHouse/issues/38258). [#38802](https://github.com/ClickHouse/ClickHouse/pull/38802) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Update `simdjson`. This fixes [#38621](https://github.com/ClickHouse/ClickHouse/issues/38621) - a buffer overflow on machines with the latest Intel CPUs with AVX-512 VBMI. [#38838](https://github.com/ClickHouse/ClickHouse/pull/38838) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix possible logical error for Vertical merges. [#38859](https://github.com/ClickHouse/ClickHouse/pull/38859) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix settings profile with seconds unit. [#38896](https://github.com/ClickHouse/ClickHouse/pull/38896) ([Raúl Marín](https://github.com/Algunenano)).
* Fix incorrect partition pruning when there is a nullable partition key. Note: most likely you don't use nullable partition keys - this is an obscure feature you should not use. Nullable keys are a nonsense and this feature is only needed for some crazy use-cases. This fixes [#38941](https://github.com/ClickHouse/ClickHouse/issues/38941). [#38946](https://github.com/ClickHouse/ClickHouse/pull/38946) ([Amos Bird](https://github.com/amosbird)).
* Improve `fsync_part_directory` for fetches. [#38993](https://github.com/ClickHouse/ClickHouse/pull/38993) ([Azat Khuzhin](https://github.com/azat)).
* Fix possible dealock inside `OvercommitTracker`. Fixes [#37794](https://github.com/ClickHouse/ClickHouse/issues/37794). [#39030](https://github.com/ClickHouse/ClickHouse/pull/39030) ([Dmitry Novik](https://github.com/novikd)).
* Fix bug in filesystem cache that could happen in some corner case which coincided with cache capacity hitting the limit. Closes [#39066](https://github.com/ClickHouse/ClickHouse/issues/39066). [#39070](https://github.com/ClickHouse/ClickHouse/pull/39070) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix some corner cases of interpretation of the arguments of window expressions. Fixes [#38538](https://github.com/ClickHouse/ClickHouse/issues/38538) Allow using of higher-order functions in window expressions. [#39112](https://github.com/ClickHouse/ClickHouse/pull/39112) ([Dmitry Novik](https://github.com/novikd)).
* Keep `LowCardinality` type in `tuple` function. Previously `LowCardinality` type was dropped and elements of created tuple had underlying type of `LowCardinality`. [#39113](https://github.com/ClickHouse/ClickHouse/pull/39113) ([Anton Popov](https://github.com/CurtizJ)).
* Fix error `Block structure mismatch` which could happen for INSERT into table with attached MATERIALIZED VIEW and enabled setting `extremes = 1`. Closes [#29759](https://github.com/ClickHouse/ClickHouse/issues/29759) and [#38729](https://github.com/ClickHouse/ClickHouse/issues/38729). [#39125](https://github.com/ClickHouse/ClickHouse/pull/39125) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix unexpected query result when both `optimize_trivial_count_query` and `empty_result_for_aggregation_by_empty_set` are set to true. This fixes [#39140](https://github.com/ClickHouse/ClickHouse/issues/39140). [#39155](https://github.com/ClickHouse/ClickHouse/pull/39155) ([Amos Bird](https://github.com/amosbird)).
* Fixed error `Not found column Type in block` in selects with `PREWHERE` and read-in-order optimizations. [#39157](https://github.com/ClickHouse/ClickHouse/pull/39157) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Fix extremely rare race condition in during hardlinks for remote filesystem. The only way to reproduce it is concurrent run of backups. [#39190](https://github.com/ClickHouse/ClickHouse/pull/39190) ([alesapin](https://github.com/alesapin)).
* (zero-copy replication is an experimental feature that should not be used in production) Fix fetch of in-memory part with `allow_remote_fs_zero_copy_replication`. [#39214](https://github.com/ClickHouse/ClickHouse/pull/39214) ([Azat Khuzhin](https://github.com/azat)).
* (MaterializedPostgreSQL - experimental feature). Fix segmentation fault in MaterializedPostgreSQL database engine, which could happen if some exception occurred at replication initialisation. Closes [#36939](https://github.com/ClickHouse/ClickHouse/issues/36939). [#39272](https://github.com/ClickHouse/ClickHouse/pull/39272) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix incorrect fetch of table metadata from PostgreSQL database engine. Closes [#33502](https://github.com/ClickHouse/ClickHouse/issues/33502). [#39283](https://github.com/ClickHouse/ClickHouse/pull/39283) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix projection exception when aggregation keys are wrapped inside other functions. This fixes [#37151](https://github.com/ClickHouse/ClickHouse/issues/37151). [#37155](https://github.com/ClickHouse/ClickHouse/pull/37155) ([Amos Bird](https://github.com/amosbird)).
* Fix possible logical error `... with argument with type Nothing and default implementation for Nothing is expected to return result with type Nothing, got ...` in some functions. Closes: [#37610](https://github.com/ClickHouse/ClickHouse/issues/37610) Closes: [#37741](https://github.com/ClickHouse/ClickHouse/issues/37741). [#37759](https://github.com/ClickHouse/ClickHouse/pull/37759) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix incorrect columns order in subqueries of UNION (in case of duplicated columns in subselects may produce incorrect result). [#37887](https://github.com/ClickHouse/ClickHouse/pull/37887) ([Azat Khuzhin](https://github.com/azat)).
* Fix incorrect work of MODIFY ALTER Column with column names that contain dots. Closes [#37907](https://github.com/ClickHouse/ClickHouse/issues/37907). [#37971](https://github.com/ClickHouse/ClickHouse/pull/37971) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix reading of sparse columns from `MergeTree` tables that store their data in S3. [#37978](https://github.com/ClickHouse/ClickHouse/pull/37978) ([Anton Popov](https://github.com/CurtizJ)).
* Fix possible crash in `Distributed` async insert in case of removing a replica from config. [#38029](https://github.com/ClickHouse/ClickHouse/pull/38029) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix "Missing columns" for GLOBAL JOIN with CTE without alias. [#38056](https://github.com/ClickHouse/ClickHouse/pull/38056) ([Azat Khuzhin](https://github.com/azat)).
* Rewrite tuple functions as literals in backwards-compatibility mode. [#38096](https://github.com/ClickHouse/ClickHouse/pull/38096) ([Anton Kozlov](https://github.com/tonickkozlov)).
* Fix redundant memory reservation for output block during `ORDER BY`. [#38127](https://github.com/ClickHouse/ClickHouse/pull/38127) ([iyupeng](https://github.com/iyupeng)).
* Fix possible logical error `Bad cast from type DB::IColumn* to DB::ColumnNullable*` in array mapped functions. Closes [#38006](https://github.com/ClickHouse/ClickHouse/issues/38006). [#38132](https://github.com/ClickHouse/ClickHouse/pull/38132) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix temporary name clash in partial merge join, close [#37928](https://github.com/ClickHouse/ClickHouse/issues/37928). [#38135](https://github.com/ClickHouse/ClickHouse/pull/38135) ([Vladimir C](https://github.com/vdimir)).
* Some minr issue with queries like `CREATE TABLE nested_name_tuples (`a` Tuple(x String, y Tuple(i Int32, j String))) ENGINE = Memory;` [#38136](https://github.com/ClickHouse/ClickHouse/pull/38136) ([lgbo](https://github.com/lgbo-ustc)).
* Fix bug with nested short-circuit functions that led to execution of arguments even if condition is false. Closes [#38040](https://github.com/ClickHouse/ClickHouse/issues/38040). [#38173](https://github.com/ClickHouse/ClickHouse/pull/38173) ([Kruglov Pavel](https://github.com/Avogar)).
* (Window View is a experimental feature) Fix LOGICAL_ERROR for WINDOW VIEW with incorrect structure. [#38205](https://github.com/ClickHouse/ClickHouse/pull/38205) ([Azat Khuzhin](https://github.com/azat)).
* Update librdkafka submodule to fix crash when an OAUTHBEARER refresh callback is set. [#38225](https://github.com/ClickHouse/ClickHouse/pull/38225) ([Rafael Acevedo](https://github.com/racevedoo)).
* Fix INSERT into Distributed hung due to ProfileEvents. [#38307](https://github.com/ClickHouse/ClickHouse/pull/38307) ([Azat Khuzhin](https://github.com/azat)).
* Fix retries in PostgreSQL engine. [#38310](https://github.com/ClickHouse/ClickHouse/pull/38310) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix optimization in PartialSortingTransform (SIGSEGV and possible incorrect result). [#38324](https://github.com/ClickHouse/ClickHouse/pull/38324) ([Azat Khuzhin](https://github.com/azat)).
* Fix RabbitMQ with formats based on PeekableReadBuffer. Closes [#38061](https://github.com/ClickHouse/ClickHouse/issues/38061). [#38356](https://github.com/ClickHouse/ClickHouse/pull/38356) ([Kseniia Sumarokova](https://github.com/kssenii)).
* MaterializedPostgreSQL - experimentail feature. Fix possible `Invalid number of rows in Chunk` in MaterializedPostgreSQL. Closes [#37323](https://github.com/ClickHouse/ClickHouse/issues/37323). [#38360](https://github.com/ClickHouse/ClickHouse/pull/38360) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix RabbitMQ configuration with connection string setting. Closes [#36531](https://github.com/ClickHouse/ClickHouse/issues/36531). [#38365](https://github.com/ClickHouse/ClickHouse/pull/38365) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix PostgreSQL engine not using PostgreSQL schema when retrieving array dimension size. Closes [#36755](https://github.com/ClickHouse/ClickHouse/issues/36755). Closes [#36772](https://github.com/ClickHouse/ClickHouse/issues/36772). [#38366](https://github.com/ClickHouse/ClickHouse/pull/38366) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix possibly incorrect result of distributed queries with `DISTINCT` and `LIMIT`. Fixes [#38282](https://github.com/ClickHouse/ClickHouse/issues/38282). [#38371](https://github.com/ClickHouse/ClickHouse/pull/38371) ([Anton Popov](https://github.com/CurtizJ)).
* Fix wrong results of countSubstrings() & position() on patterns with 0-bytes. [#38589](https://github.com/ClickHouse/ClickHouse/pull/38589) ([Robert Schulze](https://github.com/rschu1ze)).
* Now it's possible to start a clickhouse-server and attach/detach tables even for tables with the incorrect values of IPv4/IPv6 representation. Proper fix for issue [#35156](https://github.com/ClickHouse/ClickHouse/issues/35156). [#38590](https://github.com/ClickHouse/ClickHouse/pull/38590) ([alesapin](https://github.com/alesapin)).
* `rankCorr` function will work correctly if some arguments are NaNs. This closes [#38396](https://github.com/ClickHouse/ClickHouse/issues/38396). [#38722](https://github.com/ClickHouse/ClickHouse/pull/38722) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix `parallel_view_processing=1` with `optimize_trivial_insert_select=1`. Fix `max_insert_threads` while pushing to views. [#38731](https://github.com/ClickHouse/ClickHouse/pull/38731) ([Azat Khuzhin](https://github.com/azat)).
* Fix use-after-free for aggregate functions with `Map` combinator that leads to incorrect result. [#38748](https://github.com/ClickHouse/ClickHouse/pull/38748) ([Azat Khuzhin](https://github.com/azat)).

### <a id="226"></a> ClickHouse release 22.6, 2022-06-16

#### Backward Incompatible Change
* Remove support for octal number literals in SQL. In previous versions they were parsed as Float64. [#37765](https://github.com/ClickHouse/ClickHouse/pull/37765) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Changes how settings using `seconds` as type are parsed to support floating point values (for example: `max_execution_time=0.5`). Infinity or NaN values will throw an exception. [#37187](https://github.com/ClickHouse/ClickHouse/pull/37187) ([Raúl Marín](https://github.com/Algunenano)).
* Changed format of binary serialization of columns of experimental type `Object`. New format is more convenient to implement by third-party clients. [#37482](https://github.com/ClickHouse/ClickHouse/pull/37482) ([Anton Popov](https://github.com/CurtizJ)).
* Turn on setting `output_format_json_named_tuples_as_objects` by default. It allows to serialize named tuples as JSON objects in JSON formats. [#37756](https://github.com/ClickHouse/ClickHouse/pull/37756) ([Anton Popov](https://github.com/CurtizJ)).
* LIKE patterns with trailing escape symbol ('\\') are now disallowed (as mandated by the SQL standard). [#37764](https://github.com/ClickHouse/ClickHouse/pull/37764) ([Robert Schulze](https://github.com/rschu1ze)).
* If you run different ClickHouse versions on a cluster with AArch64 CPU or mix AArch64 and amd64 on a cluster, and use distributed queries with GROUP BY multiple keys of fixed-size type that fit in 256 bits but don't fit in 64 bits, and the size of the result is huge, the data will not be fully aggregated in the result of these queries during upgrade. Workaround: upgrade with downtime instead of a rolling upgrade.

#### New Feature
* Add `GROUPING` function. It allows to disambiguate the records in the queries with `ROLLUP`, `CUBE` or `GROUPING SETS`. Closes [#19426](https://github.com/ClickHouse/ClickHouse/issues/19426). [#37163](https://github.com/ClickHouse/ClickHouse/pull/37163) ([Dmitry Novik](https://github.com/novikd)).
* A new codec [FPC](https://userweb.cs.txstate.edu/~burtscher/papers/dcc07a.pdf) algorithm for floating point data compression. [#37553](https://github.com/ClickHouse/ClickHouse/pull/37553) ([Mikhail Guzov](https://github.com/koloshmet)).
* Add new columnar JSON formats: `JSONColumns`, `JSONCompactColumns`, `JSONColumnsWithMetadata`. Closes [#36338](https://github.com/ClickHouse/ClickHouse/issues/36338) Closes [#34509](https://github.com/ClickHouse/ClickHouse/issues/34509). [#36975](https://github.com/ClickHouse/ClickHouse/pull/36975) ([Kruglov Pavel](https://github.com/Avogar)).
* Added open telemetry traces visualizing tool based on d3js. [#37810](https://github.com/ClickHouse/ClickHouse/pull/37810) ([Sergei Trifonov](https://github.com/serxa)).
* Support INSERTs into `system.zookeeper` table. Closes [#22130](https://github.com/ClickHouse/ClickHouse/issues/22130). [#37596](https://github.com/ClickHouse/ClickHouse/pull/37596) ([Han Fei](https://github.com/hanfei1991)).
* Support non-constant pattern argument for `LIKE`, `ILIKE` and `match` functions. [#37251](https://github.com/ClickHouse/ClickHouse/pull/37251) ([Robert Schulze](https://github.com/rschu1ze)).
* Executable user defined functions now support parameters. Example: `SELECT test_function(parameters)(arguments)`. Closes [#37578](https://github.com/ClickHouse/ClickHouse/issues/37578). [#37720](https://github.com/ClickHouse/ClickHouse/pull/37720) ([Maksim Kita](https://github.com/kitaisreal)).
* Add `merge_reason` column to system.part_log table. [#36912](https://github.com/ClickHouse/ClickHouse/pull/36912) ([Sema Checherinda](https://github.com/CheSema)).
* Add support for Maps and Records in Avro format. Add new setting `input_format_avro_null_as_default ` that allow to insert null as default in Avro format. Closes [#18925](https://github.com/ClickHouse/ClickHouse/issues/18925) Closes [#37378](https://github.com/ClickHouse/ClickHouse/issues/37378) Closes [#32899](https://github.com/ClickHouse/ClickHouse/issues/32899). [#37525](https://github.com/ClickHouse/ClickHouse/pull/37525) ([Kruglov Pavel](https://github.com/Avogar)).
* Add `clickhouse-disks` tool to introspect and operate on virtual filesystems configured for ClickHouse. [#36060](https://github.com/ClickHouse/ClickHouse/pull/36060) ([Artyom Yurkov](https://github.com/Varinara)).
* Adds H3 unidirectional edge functions. [#36843](https://github.com/ClickHouse/ClickHouse/pull/36843) ([Bharat Nallan](https://github.com/bharatnc)).
* Add support for calculating [hashids](https://hashids.org/) from unsigned integers. [#37013](https://github.com/ClickHouse/ClickHouse/pull/37013) ([Michael Nutt](https://github.com/mnutt)).
* Explicit `SALT` specification is allowed for `CREATE USER <user> IDENTIFIED WITH sha256_hash`. [#37377](https://github.com/ClickHouse/ClickHouse/pull/37377) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Add two new settings `input_format_csv_skip_first_lines/input_format_tsv_skip_first_lines` to allow skipping specified number of lines in the beginning of the file in CSV/TSV formats. [#37537](https://github.com/ClickHouse/ClickHouse/pull/37537) ([Kruglov Pavel](https://github.com/Avogar)).
* `showCertificate` function shows current server's SSL certificate. [#37540](https://github.com/ClickHouse/ClickHouse/pull/37540) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* HTTP source for Data Dictionaries in Named Collections is supported. [#37581](https://github.com/ClickHouse/ClickHouse/pull/37581) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Implemented changing the comment for `ReplicatedMergeTree` tables. [#37416](https://github.com/ClickHouse/ClickHouse/pull/37416) ([Vasily Nemkov](https://github.com/Enmk)).
* Added `SYSTEM UNFREEZE` query that deletes the whole backup regardless if the corresponding table is deleted or not. [#36424](https://github.com/ClickHouse/ClickHouse/pull/36424) ([Vadim Volodin](https://github.com/PolyProgrammist)).

#### Experimental Feature
* Enables `POPULATE` for `WINDOW VIEW`. [#36945](https://github.com/ClickHouse/ClickHouse/pull/36945) ([vxider](https://github.com/Vxider)).
* `ALTER TABLE ... MODIFY QUERY` support for `WINDOW VIEW`. [#37188](https://github.com/ClickHouse/ClickHouse/pull/37188) ([vxider](https://github.com/Vxider)).
* This PR changes the behavior of the `ENGINE` syntax in `WINDOW VIEW`, to make it like in `MATERIALIZED VIEW`. [#37214](https://github.com/ClickHouse/ClickHouse/pull/37214) ([vxider](https://github.com/Vxider)).

#### Performance Improvement
* Added numerous optimizations for ARM NEON [#38093](https://github.com/ClickHouse/ClickHouse/pull/38093)([Daniel Kutenin](https://github.com/danlark1)), ([Alexandra Pilipyuk](https://github.com/chalice19)) Note: if you run different ClickHouse versions on a cluster with ARM CPU and use distributed queries with GROUP BY multiple keys of fixed-size type that fit in 256 bits but don't fit in 64 bits, the result of the aggregation query will be wrong during upgrade. Workaround: upgrade with downtime instead of a rolling upgrade.
* Improve performance and memory usage for select of subset of columns for formats Native, Protobuf, CapnProto, JSONEachRow, TSKV, all formats with suffixes WithNames/WithNamesAndTypes. Previously while selecting only subset of columns from files in these formats all columns were read and stored in memory. Now only required columns are read. This PR enables setting `input_format_skip_unknown_fields` by default, because otherwise in case of select of subset of columns exception will be thrown. [#37192](https://github.com/ClickHouse/ClickHouse/pull/37192) ([Kruglov Pavel](https://github.com/Avogar)).
* Now more filters can be pushed down for join. [#37472](https://github.com/ClickHouse/ClickHouse/pull/37472) ([Amos Bird](https://github.com/amosbird)).
* Load marks for only necessary columns when reading wide parts. [#36879](https://github.com/ClickHouse/ClickHouse/pull/36879) ([Anton Kozlov](https://github.com/tonickkozlov)).
* Improved performance of aggregation in case, when sparse columns (can be enabled by experimental setting `ratio_of_defaults_for_sparse_serialization` in `MergeTree` tables) are used as arguments in aggregate functions. [#37617](https://github.com/ClickHouse/ClickHouse/pull/37617) ([Anton Popov](https://github.com/CurtizJ)).
* Optimize function `COALESCE` with two arguments. [#37666](https://github.com/ClickHouse/ClickHouse/pull/37666) ([Anton Popov](https://github.com/CurtizJ)).
* Replace `multiIf` to `if` in case when `multiIf` has only one condition, because function `if` is more performant. [#37695](https://github.com/ClickHouse/ClickHouse/pull/37695) ([Anton Popov](https://github.com/CurtizJ)).
* Improve performance of `dictGetDescendants`, `dictGetChildren` functions, create temporary parent to children hierarchical index per query, not per function call during query. Allow to specify `BIDIRECTIONAL` for `HIERARHICAL` attributes, dictionary will maintain parent to children index in memory, that way functions `dictGetDescendants`, `dictGetChildren` will not create temporary index per query. Closes [#32481](https://github.com/ClickHouse/ClickHouse/issues/32481). [#37148](https://github.com/ClickHouse/ClickHouse/pull/37148) ([Maksim Kita](https://github.com/kitaisreal)).
* Aggregates state destruction now may be posted on a thread pool. For queries with LIMIT and big state it provides significant speedup, e.g. `select uniq(number) from numbers_mt(1e7) group by number limit 100` became around 2.5x faster. [#37855](https://github.com/ClickHouse/ClickHouse/pull/37855) ([Nikita Taranov](https://github.com/nickitat)).
* Improve sort performance by single column. [#37195](https://github.com/ClickHouse/ClickHouse/pull/37195) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of single column sorting using sorting queue specializations. [#37990](https://github.com/ClickHouse/ClickHouse/pull/37990) ([Maksim Kita](https://github.com/kitaisreal)).
* Improved performance on array norm and distance functions 2x-4x times. [#37394](https://github.com/ClickHouse/ClickHouse/pull/37394) ([Alexander Gololobov](https://github.com/davenger)).
* Improve performance of number comparison functions using dynamic dispatch. [#37399](https://github.com/ClickHouse/ClickHouse/pull/37399) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of ORDER BY with LIMIT. [#37481](https://github.com/ClickHouse/ClickHouse/pull/37481) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of `hasAll` function using dynamic dispatch infrastructure. [#37484](https://github.com/ClickHouse/ClickHouse/pull/37484) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of `greatCircleAngle`, `greatCircleDistance`, `geoDistance` functions. [#37524](https://github.com/ClickHouse/ClickHouse/pull/37524) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of insert into MergeTree if there are multiple columns in ORDER BY. [#35762](https://github.com/ClickHouse/ClickHouse/pull/35762) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix excessive CPU usage in background when there are a lot of tables. [#38028](https://github.com/ClickHouse/ClickHouse/pull/38028) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of `not` function using dynamic dispatch. [#38058](https://github.com/ClickHouse/ClickHouse/pull/38058) ([Maksim Kita](https://github.com/kitaisreal)).
* Optimized the internal caching of re2 patterns which occur e.g. in LIKE and MATCH functions. [#37544](https://github.com/ClickHouse/ClickHouse/pull/37544) ([Robert Schulze](https://github.com/rschu1ze)).
* Improve filter bitmask generator function all in one with AVX-512 instructions. [#37588](https://github.com/ClickHouse/ClickHouse/pull/37588) ([yaqi-zhao](https://github.com/yaqi-zhao)).
* Apply read method `threadpool` for Hive integration engine. This will significantly speed up reading. [#36328](https://github.com/ClickHouse/ClickHouse/pull/36328) ([李扬](https://github.com/taiyang-li)).
* When all the columns to read are partition keys, construct columns by the file's row number without real reading the Hive file. [#37103](https://github.com/ClickHouse/ClickHouse/pull/37103) ([lgbo](https://github.com/lgbo-ustc)).
* Support multi disks for caching hive files. [#37279](https://github.com/ClickHouse/ClickHouse/pull/37279) ([lgbo](https://github.com/lgbo-ustc)).
* Limiting the maximum cache usage per query can effectively prevent cache pool contamination. [Related Issues](https://github.com/ClickHouse/ClickHouse/issues/28961). [#37859](https://github.com/ClickHouse/ClickHouse/pull/37859) ([Han Shukai](https://github.com/KinderRiven)).
* Currently clickhouse directly downloads all remote files to the local cache (even if they are only read once), which will frequently cause IO of the local hard disk. In some scenarios, these IOs may not be necessary and may easily cause negative optimization. As shown in the figure below, when we run SSB Q1-Q4, the performance of the cache has caused negative optimization. [#37516](https://github.com/ClickHouse/ClickHouse/pull/37516) ([Han Shukai](https://github.com/KinderRiven)).
* Allow to prune the list of files via virtual columns such as `_file` and `_path` when reading from S3. This is for [#37174](https://github.com/ClickHouse/ClickHouse/issues/37174) , [#23494](https://github.com/ClickHouse/ClickHouse/issues/23494). [#37356](https://github.com/ClickHouse/ClickHouse/pull/37356) ([Amos Bird](https://github.com/amosbird)).
* In function: CompressedWriteBuffer::nextImpl(), there is an unnecessary write-copy step that would happen frequently during inserting data. Below shows the differentiation with this patch: - Before: 1. Compress "working_buffer" into "compressed_buffer" 2. write-copy into "out" - After: Directly Compress "working_buffer" into "out". [#37242](https://github.com/ClickHouse/ClickHouse/pull/37242) ([jasperzhu](https://github.com/jinjunzh)).

#### Improvement
* Support types with non-standard defaults in ROLLUP, CUBE, GROUPING SETS. Closes [#37360](https://github.com/ClickHouse/ClickHouse/issues/37360). [#37667](https://github.com/ClickHouse/ClickHouse/pull/37667) ([Dmitry Novik](https://github.com/novikd)).
* Fix stack traces collection on ARM. Closes [#37044](https://github.com/ClickHouse/ClickHouse/issues/37044). Closes [#15638](https://github.com/ClickHouse/ClickHouse/issues/15638). [#37797](https://github.com/ClickHouse/ClickHouse/pull/37797) ([Maksim Kita](https://github.com/kitaisreal)).
* Client will try every IP address returned by DNS resolution until successful connection. [#37273](https://github.com/ClickHouse/ClickHouse/pull/37273) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Allow to use String type instead of Binary in Arrow/Parquet/ORC formats. This PR introduces 3 new settings for it: `output_format_arrow_string_as_string`, `output_format_parquet_string_as_string`, `output_format_orc_string_as_string`. Default value for all settings is `false`. [#37327](https://github.com/ClickHouse/ClickHouse/pull/37327) ([Kruglov Pavel](https://github.com/Avogar)).
* Apply setting `input_format_max_rows_to_read_for_schema_inference` for all read rows in total from all files in globs. Previously setting `input_format_max_rows_to_read_for_schema_inference` was applied for each file in glob separately and in case of huge number of nulls we could read first `input_format_max_rows_to_read_for_schema_inference` rows from each file and get nothing. Also increase default value for this setting to 25000. [#37332](https://github.com/ClickHouse/ClickHouse/pull/37332) ([Kruglov Pavel](https://github.com/Avogar)).
* Add separate `CLUSTER` grant (and `access_control_improvements.on_cluster_queries_require_cluster_grant` configuration directive, for backward compatibility, default to `false`). [#35767](https://github.com/ClickHouse/ClickHouse/pull/35767) ([Azat Khuzhin](https://github.com/azat)).
* Added support for schema inference for `hdfsCluster`. [#35812](https://github.com/ClickHouse/ClickHouse/pull/35812) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Implement `least_used` load balancing algorithm for disks inside volume (multi disk configuration). [#36686](https://github.com/ClickHouse/ClickHouse/pull/36686) ([Azat Khuzhin](https://github.com/azat)).
* Modify the HTTP Endpoint to return the full stats under the `X-ClickHouse-Summary` header when `send_progress_in_http_headers=0` (before it would return all zeros). - Modify the HTTP Endpoint to return `X-ClickHouse-Exception-Code` header when progress has been sent before (`send_progress_in_http_headers=1`) - Modify the HTTP Endpoint to return `HTTP_REQUEST_TIMEOUT` (408) instead of `HTTP_INTERNAL_SERVER_ERROR` (500) on `TIMEOUT_EXCEEDED` errors. [#36884](https://github.com/ClickHouse/ClickHouse/pull/36884) ([Raúl Marín](https://github.com/Algunenano)).
* Allow a user to inspect grants from granted roles. [#36941](https://github.com/ClickHouse/ClickHouse/pull/36941) ([nvartolomei](https://github.com/nvartolomei)).
* Do not calculate an integral numerically but use CDF functions instead. This will speed up execution and will increase the precision. This fixes [#36714](https://github.com/ClickHouse/ClickHouse/issues/36714). [#36953](https://github.com/ClickHouse/ClickHouse/pull/36953) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Add default implementation for Nothing in functions. Now most of the functions will return column with type Nothing in case one of it's arguments is Nothing. It also solves problem with functions like arrayMap/arrayFilter and similar when they have empty array as an argument. Previously queries like `select arrayMap(x -> 2 * x, []);` failed because function inside lambda cannot work with type `Nothing`, now such queries return empty array with type `Array(Nothing)`. Also add support for arrays of nullable types in functions like arrayFilter/arrayFill. Previously, queries like `select arrayFilter(x -> x % 2, [1, NULL])` failed, now they work (if the result of lambda is NULL, then this value won't be included in the result). Closes [#37000](https://github.com/ClickHouse/ClickHouse/issues/37000). [#37048](https://github.com/ClickHouse/ClickHouse/pull/37048) ([Kruglov Pavel](https://github.com/Avogar)).
* Now if a shard has local replica we create a local plan and a plan to read from all remote replicas. They have shared initiator which coordinates reading. [#37204](https://github.com/ClickHouse/ClickHouse/pull/37204) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Do no longer abort server startup if configuration option "mark_cache_size" is not explicitly set. [#37326](https://github.com/ClickHouse/ClickHouse/pull/37326) ([Robert Schulze](https://github.com/rschu1ze)).
* Allows providing `NULL`/`NOT NULL` right after type in column declaration. [#37337](https://github.com/ClickHouse/ClickHouse/pull/37337) ([Igor Nikonov](https://github.com/devcrafter)).
* optimize file segment PARTIALLY_DOWNLOADED get read buffer. [#37338](https://github.com/ClickHouse/ClickHouse/pull/37338) ([xiedeyantu](https://github.com/xiedeyantu)).
* Try to improve short circuit functions processing to fix problems with stress tests. [#37384](https://github.com/ClickHouse/ClickHouse/pull/37384) ([Kruglov Pavel](https://github.com/Avogar)).
* Generate multiple columns with UUID (generateUUIDv4(1), generateUUIDv4(2)) [#37395](https://github.com/ClickHouse/ClickHouse/issues/37395). [#37415](https://github.com/ClickHouse/ClickHouse/pull/37415) ([Memo](https://github.com/Joeywzr)).
* Fix extremely rare deadlock during part fetch in zero-copy replication. Fixes [#37423](https://github.com/ClickHouse/ClickHouse/issues/37423). [#37424](https://github.com/ClickHouse/ClickHouse/pull/37424) ([metahys](https://github.com/metahys)).
* Don't allow to create storage with unknown data format. [#37450](https://github.com/ClickHouse/ClickHouse/pull/37450) ([Kruglov Pavel](https://github.com/Avogar)).
* Set `global_memory_usage_overcommit_max_wait_microseconds` default value to 5 seconds. Add info about `OvercommitTracker` to OOM exception message. Add `MemoryOvercommitWaitTimeMicroseconds` profile event. [#37460](https://github.com/ClickHouse/ClickHouse/pull/37460) ([Dmitry Novik](https://github.com/novikd)).
* Do not display `-0.0` CPU time in clickhouse-client. It can appear due to rounding errors. This closes [#38003](https://github.com/ClickHouse/ClickHouse/issues/38003). This closes [#38038](https://github.com/ClickHouse/ClickHouse/issues/38038). [#38064](https://github.com/ClickHouse/ClickHouse/pull/38064) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Play UI: Keep controls in place when the page is scrolled horizontally. This makes edits comfortable even if the table is wide and it was scrolled far to the right. The feature proposed by Maksym Tereshchenko from CaspianDB. [#37470](https://github.com/ClickHouse/ClickHouse/pull/37470) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Modify query div in play.html to be extendable beyond 20% height. In case of very long queries it is helpful to extend the textarea element, only today, since the div is fixed height, the extended textarea hides the data div underneath. With this fix, extending the textarea element will push the data div down/up such the extended textarea won't hide it. Also, keeps query box width 100% even when the user adjusting the size of the query textarea. [#37488](https://github.com/ClickHouse/ClickHouse/pull/37488) ([guyco87](https://github.com/guyco87)).
* Added `ProfileEvents` for introspection of type of written (inserted or merged) parts (`Inserted{Wide/Compact/InMemory}Parts`, `MergedInto{Wide/Compact/InMemory}Parts`. Added column `part_type` to `system.part_log`. Resolves [#37495](https://github.com/ClickHouse/ClickHouse/issues/37495). [#37536](https://github.com/ClickHouse/ClickHouse/pull/37536) ([Anton Popov](https://github.com/CurtizJ)).
* clickhouse-keeper improvement: move broken logs to a timestamped folder. [#37565](https://github.com/ClickHouse/ClickHouse/pull/37565) ([Antonio Andelic](https://github.com/antonio2368)).
* Do not write expired columns by TTL after subsequent merges (before only first merge/optimize of the part will not write expired by TTL columns, all other will do). [#37570](https://github.com/ClickHouse/ClickHouse/pull/37570) ([Azat Khuzhin](https://github.com/azat)).
* More precise result of the `dumpColumnStructure` miscellaneous function in presence of LowCardinality or Sparse columns. In previous versions, these functions were converting the argument to a full column before returning the result. This is needed to provide an answer in [#6935](https://github.com/ClickHouse/ClickHouse/issues/6935). [#37633](https://github.com/ClickHouse/ClickHouse/pull/37633) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* clickhouse-keeper: store only unique session IDs for watches. [#37641](https://github.com/ClickHouse/ClickHouse/pull/37641) ([Azat Khuzhin](https://github.com/azat)).
* Fix possible "Cannot write to finalized buffer". [#37645](https://github.com/ClickHouse/ClickHouse/pull/37645) ([Azat Khuzhin](https://github.com/azat)).
* Add setting `support_batch_delete` for `DiskS3` to disable multiobject delete calls, which Google Cloud Storage doesn't support. [#37659](https://github.com/ClickHouse/ClickHouse/pull/37659) ([Fred Wulff](https://github.com/frew)).
* Add an option to disable connection pooling in ODBC bridge. [#37705](https://github.com/ClickHouse/ClickHouse/pull/37705) ([Anton Kozlov](https://github.com/tonickkozlov)).
* Functions `dictGetHierarchy`, `dictIsIn`, `dictGetChildren`, `dictGetDescendants` added support nullable `HIERARCHICAL` attribute in dictionaries. Closes [#35521](https://github.com/ClickHouse/ClickHouse/issues/35521). [#37805](https://github.com/ClickHouse/ClickHouse/pull/37805) ([Maksim Kita](https://github.com/kitaisreal)).
* Expose BoringSSL version related info in the `system.build_options` table. [#37850](https://github.com/ClickHouse/ClickHouse/pull/37850) ([Bharat Nallan](https://github.com/bharatnc)).
* Now clickhouse-server removes `delete_tmp` directories on server start. Fixes [#26503](https://github.com/ClickHouse/ClickHouse/issues/26503). [#37906](https://github.com/ClickHouse/ClickHouse/pull/37906) ([alesapin](https://github.com/alesapin)).
* Clean up broken detached parts after timeout. Closes [#25195](https://github.com/ClickHouse/ClickHouse/issues/25195). [#37975](https://github.com/ClickHouse/ClickHouse/pull/37975) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Now in MergeTree table engines family failed-to-move parts will be removed instantly. [#37994](https://github.com/ClickHouse/ClickHouse/pull/37994) ([alesapin](https://github.com/alesapin)).
* Now if setting `always_fetch_merged_part` is enabled for ReplicatedMergeTree merges will try to find parts on other replicas rarely with smaller load for [Zoo]Keeper. [#37995](https://github.com/ClickHouse/ClickHouse/pull/37995) ([alesapin](https://github.com/alesapin)).
* Add implicit grants with grant option too. For example `GRANT CREATE TABLE ON test.* TO A WITH GRANT OPTION` now allows `A` to execute `GRANT CREATE VIEW ON test.* TO B`. [#38017](https://github.com/ClickHouse/ClickHouse/pull/38017) ([Vitaly Baranov](https://github.com/vitlibar)).

#### Build/Testing/Packaging Improvement
* Use `clang-14` and LLVM infrastructure version 14 for builds. This closes [#34681](https://github.com/ClickHouse/ClickHouse/issues/34681). [#34754](https://github.com/ClickHouse/ClickHouse/pull/34754) ([Alexey Milovidov](https://github.com/alexey-milovidov)). Note: `clang-14` has [a bug](https://github.com/google/sanitizers/issues/1540) in ThreadSanitizer that makes our CI work worse.
* Allow to drop privileges at startup. This simplifies Docker images. Closes [#36293](https://github.com/ClickHouse/ClickHouse/issues/36293). [#36341](https://github.com/ClickHouse/ClickHouse/pull/36341) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Add docs spellcheck to CI. [#37790](https://github.com/ClickHouse/ClickHouse/pull/37790) ([Vladimir C](https://github.com/vdimir)).
* Fix overly aggressive stripping which removed the embedded hash required for checking the consistency of the executable. [#37993](https://github.com/ClickHouse/ClickHouse/pull/37993) ([Robert Schulze](https://github.com/rschu1ze)).

#### Bug Fix

* Fix `SELECT ... INTERSECT` and `EXCEPT SELECT` statements with constant string types. [#37738](https://github.com/ClickHouse/ClickHouse/pull/37738) ([Antonio Andelic](https://github.com/antonio2368)).
* Fix `GROUP BY` `AggregateFunction` (i.e. you `GROUP BY` by the column that has `AggregateFunction` type). [#37093](https://github.com/ClickHouse/ClickHouse/pull/37093) ([Azat Khuzhin](https://github.com/azat)).
* (experimental WINDOW VIEW) Fix `addDependency` in WindowView. This bug can be reproduced like [#37237](https://github.com/ClickHouse/ClickHouse/issues/37237). [#37224](https://github.com/ClickHouse/ClickHouse/pull/37224) ([vxider](https://github.com/Vxider)).
* Fix inconsistency in ORDER BY ... WITH FILL feature. Query, containing ORDER BY ... WITH FILL, can generate extra rows when multiple WITH FILL columns are present. [#38074](https://github.com/ClickHouse/ClickHouse/pull/38074) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* This PR moving `addDependency` from constructor to `startup()` to avoid adding dependency to a *dropped* table, fix [#37237](https://github.com/ClickHouse/ClickHouse/issues/37237). [#37243](https://github.com/ClickHouse/ClickHouse/pull/37243) ([vxider](https://github.com/Vxider)).
* Fix inserting defaults for missing values in columnar formats. Previously missing columns were filled with defaults for types, not for columns. [#37253](https://github.com/ClickHouse/ClickHouse/pull/37253) ([Kruglov Pavel](https://github.com/Avogar)).
* (experimental Object type) Fix some cases of insertion nested arrays to columns of type `Object`. [#37305](https://github.com/ClickHouse/ClickHouse/pull/37305) ([Anton Popov](https://github.com/CurtizJ)).
* Fix unexpected errors with a clash of constant strings in aggregate function, prewhere and join. Close [#36891](https://github.com/ClickHouse/ClickHouse/issues/36891). [#37336](https://github.com/ClickHouse/ClickHouse/pull/37336) ([Vladimir C](https://github.com/vdimir)).
* Fix projections with GROUP/ORDER BY in query and optimize_aggregation_in_order (before the result was incorrect since only finish sorting was performed). [#37342](https://github.com/ClickHouse/ClickHouse/pull/37342) ([Azat Khuzhin](https://github.com/azat)).
* Fixed error with symbols in key name in S3. Fixes [#33009](https://github.com/ClickHouse/ClickHouse/issues/33009). [#37344](https://github.com/ClickHouse/ClickHouse/pull/37344) ([Vladimir Chebotarev](https://github.com/excitoon)).
* Throw an exception when GROUPING SETS used with ROLLUP or CUBE. [#37367](https://github.com/ClickHouse/ClickHouse/pull/37367) ([Dmitry Novik](https://github.com/novikd)).
* Fix LOGICAL_ERROR in getMaxSourcePartsSizeForMerge during merges (in case of non standard, greater, values of `background_pool_size`/`background_merges_mutations_concurrency_ratio` has been specified in `config.xml` (new way) not in `users.xml` (deprecated way)). [#37413](https://github.com/ClickHouse/ClickHouse/pull/37413) ([Azat Khuzhin](https://github.com/azat)).
* Stop removing UTF-8 BOM in RowBinary format. [#37428](https://github.com/ClickHouse/ClickHouse/pull/37428) ([Paul Loyd](https://github.com/loyd)). [#37428](https://github.com/ClickHouse/ClickHouse/pull/37428) ([Paul Loyd](https://github.com/loyd)).
* clickhouse-keeper bugfix: fix force recovery for single node cluster. [#37440](https://github.com/ClickHouse/ClickHouse/pull/37440) ([Antonio Andelic](https://github.com/antonio2368)).
* Fix logical error in normalizeUTF8 functions. Closes [#37298](https://github.com/ClickHouse/ClickHouse/issues/37298). [#37443](https://github.com/ClickHouse/ClickHouse/pull/37443) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix cast lowcard of nullable in JoinSwitcher, close [#37385](https://github.com/ClickHouse/ClickHouse/issues/37385). [#37453](https://github.com/ClickHouse/ClickHouse/pull/37453) ([Vladimir C](https://github.com/vdimir)).
* Fix named tuples output in ORC/Arrow/Parquet formats. [#37458](https://github.com/ClickHouse/ClickHouse/pull/37458) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix optimization of monotonous functions in ORDER BY clause in presence of GROUPING SETS. Fixes [#37401](https://github.com/ClickHouse/ClickHouse/issues/37401). [#37493](https://github.com/ClickHouse/ClickHouse/pull/37493) ([Dmitry Novik](https://github.com/novikd)).
* Fix error on joining with dictionary on some conditions. Close [#37386](https://github.com/ClickHouse/ClickHouse/issues/37386). [#37530](https://github.com/ClickHouse/ClickHouse/pull/37530) ([Vladimir C](https://github.com/vdimir)).
* Prohibit `optimize_aggregation_in_order` with `GROUPING SETS` (fixes `LOGICAL_ERROR`). [#37542](https://github.com/ClickHouse/ClickHouse/pull/37542) ([Azat Khuzhin](https://github.com/azat)).
* Fix wrong dump information of ActionsDAG. [#37587](https://github.com/ClickHouse/ClickHouse/pull/37587) ([zhanglistar](https://github.com/zhanglistar)).
* Fix converting types for UNION queries (may produce LOGICAL_ERROR). [#37593](https://github.com/ClickHouse/ClickHouse/pull/37593) ([Azat Khuzhin](https://github.com/azat)).
* Fix `WITH FILL` modifier with negative intervals in `STEP` clause. Fixes [#37514](https://github.com/ClickHouse/ClickHouse/issues/37514). [#37600](https://github.com/ClickHouse/ClickHouse/pull/37600) ([Anton Popov](https://github.com/CurtizJ)).
* Fix illegal joinGet array usage when ` join_use_nulls = 1`. This fixes [#37562](https://github.com/ClickHouse/ClickHouse/issues/37562) . [#37650](https://github.com/ClickHouse/ClickHouse/pull/37650) ([Amos Bird](https://github.com/amosbird)).
* Fix columns number mismatch in cross join, close [#37561](https://github.com/ClickHouse/ClickHouse/issues/37561). [#37653](https://github.com/ClickHouse/ClickHouse/pull/37653) ([Vladimir C](https://github.com/vdimir)).
* Fix segmentation fault in `show create table` from mysql database when it is configured with named collections. Closes [#37683](https://github.com/ClickHouse/ClickHouse/issues/37683). [#37690](https://github.com/ClickHouse/ClickHouse/pull/37690) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix RabbitMQ Storage not being able to startup on server restart if storage was create without SETTINGS clause. Closes [#37463](https://github.com/ClickHouse/ClickHouse/issues/37463). [#37691](https://github.com/ClickHouse/ClickHouse/pull/37691) ([Kseniia Sumarokova](https://github.com/kssenii)).
* SQL user defined functions disable CREATE/DROP in readonly mode. Closes [#37280](https://github.com/ClickHouse/ClickHouse/issues/37280). [#37699](https://github.com/ClickHouse/ClickHouse/pull/37699) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix formatting of Nullable arguments for executable user defined functions. Closes [#35897](https://github.com/ClickHouse/ClickHouse/issues/35897). [#37711](https://github.com/ClickHouse/ClickHouse/pull/37711) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix optimization enabled by setting `optimize_monotonous_functions_in_order_by` in distributed queries. Fixes [#36037](https://github.com/ClickHouse/ClickHouse/issues/36037). [#37724](https://github.com/ClickHouse/ClickHouse/pull/37724) ([Anton Popov](https://github.com/CurtizJ)).
* Fix possible logical error: `Invalid Field get from type UInt64 to type Float64` in `values` table function. Closes [#37602](https://github.com/ClickHouse/ClickHouse/issues/37602). [#37754](https://github.com/ClickHouse/ClickHouse/pull/37754) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix possible segfault in schema inference in case of exception in SchemaReader constructor. Closes [#37680](https://github.com/ClickHouse/ClickHouse/issues/37680). [#37760](https://github.com/ClickHouse/ClickHouse/pull/37760) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix setting cast_ipv4_ipv6_default_on_conversion_error for internal cast function. Closes [#35156](https://github.com/ClickHouse/ClickHouse/issues/35156). [#37761](https://github.com/ClickHouse/ClickHouse/pull/37761) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix toString error on DatatypeDate32. [#37775](https://github.com/ClickHouse/ClickHouse/pull/37775) ([LiuNeng](https://github.com/liuneng1994)).
* The clickhouse-keeper setting `dead_session_check_period_ms` was transformed into microseconds (multiplied by 1000), which lead to dead sessions only being cleaned up after several minutes (instead of 500ms). [#37824](https://github.com/ClickHouse/ClickHouse/pull/37824) ([Michael Lex](https://github.com/mlex)).
* Fix possible "No more packets are available" for distributed queries (in case of `async_socket_for_remote`/`use_hedged_requests` is disabled). [#37826](https://github.com/ClickHouse/ClickHouse/pull/37826) ([Azat Khuzhin](https://github.com/azat)).
* (experimental WINDOW VIEW) Do not drop the inner target table when executing `ALTER TABLE … MODIFY QUERY` in WindowView. [#37879](https://github.com/ClickHouse/ClickHouse/pull/37879) ([vxider](https://github.com/Vxider)).
* Fix directory ownership of coordination dir in clickhouse-keeper Docker image. Fixes [#37914](https://github.com/ClickHouse/ClickHouse/issues/37914). [#37915](https://github.com/ClickHouse/ClickHouse/pull/37915) ([James Maidment](https://github.com/jamesmaidment)).
* Dictionaries fix custom query with update field and `{condition}`. Closes [#33746](https://github.com/ClickHouse/ClickHouse/issues/33746). [#37947](https://github.com/ClickHouse/ClickHouse/pull/37947) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix possible incorrect result of `SELECT ... WITH FILL` in the case when `ORDER BY` should be applied after `WITH FILL` result (e.g. for outer query). Incorrect result was caused by optimization for `ORDER BY` expressions ([#35623](https://github.com/ClickHouse/ClickHouse/issues/35623)). Closes [#37904](https://github.com/ClickHouse/ClickHouse/issues/37904). [#37959](https://github.com/ClickHouse/ClickHouse/pull/37959) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* (experimental WINDOW VIEW) Add missing default columns when pushing to the target table in WindowView, fix [#37815](https://github.com/ClickHouse/ClickHouse/issues/37815). [#37965](https://github.com/ClickHouse/ClickHouse/pull/37965) ([vxider](https://github.com/Vxider)).
* Fixed too large stack frame that would cause compilation to fail. [#37996](https://github.com/ClickHouse/ClickHouse/pull/37996) ([Han Shukai](https://github.com/KinderRiven)).
* When open enable_filesystem_query_cache_limit, throw Reserved cache size exceeds the remaining cache size. [#38004](https://github.com/ClickHouse/ClickHouse/pull/38004) ([xiedeyantu](https://github.com/xiedeyantu)).
* Fix converting types for UNION queries (may produce LOGICAL_ERROR). [#34775](https://github.com/ClickHouse/ClickHouse/pull/34775) ([Azat Khuzhin](https://github.com/azat)).
* TTL merge may not be scheduled again if BackgroundExecutor is busy. --merges_with_ttl_counter is increased in selectPartsToMerge() --merge task will be ignored if BackgroundExecutor is busy --merges_with_ttl_counter will not be decrease. [#36387](https://github.com/ClickHouse/ClickHouse/pull/36387) ([lthaooo](https://github.com/lthaooo)).
* Fix overridden settings value of `normalize_function_names`. [#36937](https://github.com/ClickHouse/ClickHouse/pull/36937) ([李扬](https://github.com/taiyang-li)).
* Fix for exponential time decaying window functions. Now respecting boundaries of the window. [#36944](https://github.com/ClickHouse/ClickHouse/pull/36944) ([Vladimir Chebotarev](https://github.com/excitoon)).
* Fix possible heap-use-after-free error when reading system.projection_parts and system.projection_parts_columns . This fixes [#37184](https://github.com/ClickHouse/ClickHouse/issues/37184). [#37185](https://github.com/ClickHouse/ClickHouse/pull/37185) ([Amos Bird](https://github.com/amosbird)).
* Fixed `DateTime64` fractional seconds behavior prior to Unix epoch. [#37697](https://github.com/ClickHouse/ClickHouse/pull/37697) ([Andrey Zvonov](https://github.com/zvonand)). [#37039](https://github.com/ClickHouse/ClickHouse/pull/37039) ([李扬](https://github.com/taiyang-li)).


### <a id="225"></a> ClickHouse release 22.5, 2022-05-19

#### Upgrade Notes

* Now, background merges, mutations and `OPTIMIZE` will not increment `SelectedRows` and `SelectedBytes` metrics. They (still) will increment `MergedRows` and `MergedUncompressedBytes` as it was before. This only affects the metric values, and makes them better. This change does not introduce any incompatibility, but you may wonder about the changes of metrics, so we put in this category. [#37040](https://github.com/ClickHouse/ClickHouse/pull/37040) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Updated the BoringSSL module to the official FIPS compliant version. This makes ClickHouse FIPS compliant. [#35914](https://github.com/ClickHouse/ClickHouse/pull/35914) ([Meena-Renganathan](https://github.com/Meena-Renganathan)). The ciphers `aes-192-cfb128` and `aes-256-cfb128` were removed, because they are not included in the FIPS certified version of BoringSSL.
* `max_memory_usage` setting is removed from the default user profile in `users.xml`. This enables flexible memory limits for queries instead of the old rigid limit of 10 GB.
* Disable `log_query_threads` setting by default. It controls the logging of statistics about every thread participating in query execution. After supporting asynchronous reads, the total number of distinct thread ids became too large, and logging into the `query_thread_log` has become too heavy. [#37077](https://github.com/ClickHouse/ClickHouse/pull/37077) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Remove function `groupArraySorted` which has a bug. [#36822](https://github.com/ClickHouse/ClickHouse/pull/36822) ([Alexey Milovidov](https://github.com/alexey-milovidov)).

#### New Feature

* Enable memory overcommit by default. [#35921](https://github.com/ClickHouse/ClickHouse/pull/35921) ([Dmitry Novik](https://github.com/novikd)).
* Add support of GROUPING SETS in GROUP BY clause. This implementation supports a parallel processing of grouping sets. [#33631](https://github.com/ClickHouse/ClickHouse/pull/33631) ([Dmitry Novik](https://github.com/novikd)).
* Added `system.certificates` table. [#37142](https://github.com/ClickHouse/ClickHouse/pull/37142) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Adds `h3Line`, `h3Distance` and `h3HexRing` functions. [#37030](https://github.com/ClickHouse/ClickHouse/pull/37030) ([Bharat Nallan](https://github.com/bharatnc)).
* New single binary based diagnostics tool (clickhouse-diagnostics). [#36705](https://github.com/ClickHouse/ClickHouse/pull/36705) ([Dale McDiarmid](https://github.com/gingerwizard)).
* Add output format `Prometheus` [#36051](https://github.com/ClickHouse/ClickHouse/issues/36051). [#36206](https://github.com/ClickHouse/ClickHouse/pull/36206) ([Vladimir C](https://github.com/vdimir)).
* Add `MySQLDump` input format. It reads all data from INSERT queries belonging to one table in dump. If there are more than one table, by default it reads data from the first one. [#36667](https://github.com/ClickHouse/ClickHouse/pull/36667) ([Kruglov Pavel](https://github.com/Avogar)).
* Show the `total_rows` and `total_bytes` fields in `system.tables` for temporary tables. [#36401](https://github.com/ClickHouse/ClickHouse/issues/36401). [#36439](https://github.com/ClickHouse/ClickHouse/pull/36439) ([xiedeyantu](https://github.com/xiedeyantu)).
* Allow to override `parts_to_delay_insert` and `parts_to_throw_insert` with query-level settings. If they are defined, they will override table-level settings. [#36371](https://github.com/ClickHouse/ClickHouse/pull/36371) ([Memo](https://github.com/Joeywzr)).

#### Experimental Feature

* Implemented L1, L2, Linf, Cosine distance functions for arrays and L1, L2, Linf norm functions for arrays.
 [#37033](https://github.com/ClickHouse/ClickHouse/pull/37033) ([qieqieplus](https://github.com/qieqieplus)). Caveat: the functions will be renamed.
* Improve the `WATCH` query in WindowView: 1. Reduce the latency of providing query results by calling the `fire_condition` signal. 2. Makes the cancel query operation(ctrl-c) faster, by checking `isCancelled()` more frequently. [#37226](https://github.com/ClickHouse/ClickHouse/pull/37226) ([vxider](https://github.com/Vxider)).
* Introspection for remove filesystem cache. [#36802](https://github.com/ClickHouse/ClickHouse/pull/36802) ([Han Shukai](https://github.com/KinderRiven)).
* Added new hash function `wyHash64` for SQL. [#36467](https://github.com/ClickHouse/ClickHouse/pull/36467) ([olevino](https://github.com/olevino)).
* Improvement for replicated databases: Added `SYSTEM SYNC DATABASE REPLICA` query which allows to sync tables metadata inside Replicated database, because currently synchronisation is asynchronous. [#35944](https://github.com/ClickHouse/ClickHouse/pull/35944) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Improvement for remote filesystem cache: Better read from cache. [#37054](https://github.com/ClickHouse/ClickHouse/pull/37054) ([Kseniia Sumarokova](https://github.com/kssenii)). Improve `SYSTEM DROP FILESYSTEM CACHE` query: `<path>` option and `FORCE` option. [#36639](https://github.com/ClickHouse/ClickHouse/pull/36639) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Improvement for semistructured data: Allow to cast columns of type `Object(...)` to `Object(Nullable(...))`. [#36564](https://github.com/ClickHouse/ClickHouse/pull/36564) ([awakeljw](https://github.com/awakeljw)).
* Improvement for parallel replicas: We create a local interpreter if we want to execute query on localhost replica. But for when executing query on multiple replicas we rely on the fact that a connection exists so replicas can talk to coordinator. It is now improved and localhost replica can talk to coordinator directly in the same process. [#36281](https://github.com/ClickHouse/ClickHouse/pull/36281) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).

#### Performance Improvement

* Improve performance of `avg`, `sum` aggregate functions if used without GROUP BY expression. [#37257](https://github.com/ClickHouse/ClickHouse/pull/37257) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of unary arithmetic functions (`bitCount`, `bitNot`, `abs`, `intExp2`, `intExp10`, `negate`, `roundAge`, `roundDuration`, `roundToExp2`, `sign`) using dynamic dispatch. [#37289](https://github.com/ClickHouse/ClickHouse/pull/37289) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of ORDER BY, MergeJoin, insertion into MergeTree using JIT compilation of sort columns comparator. [#34469](https://github.com/ClickHouse/ClickHouse/pull/34469) ([Maksim Kita](https://github.com/kitaisreal)).
* Change structure of `system.asynchronous_metric_log`. It will take about 10 times less space. This closes [#36357](https://github.com/ClickHouse/ClickHouse/issues/36357). The field `event_time_microseconds` was removed, because it is useless. [#36360](https://github.com/ClickHouse/ClickHouse/pull/36360) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Load marks for only necessary columns when reading wide parts. [#36879](https://github.com/ClickHouse/ClickHouse/pull/36879) ([Anton Kozlov](https://github.com/tonickkozlov)).
* Improves performance of file descriptor cache by narrowing mutex scopes. [#36682](https://github.com/ClickHouse/ClickHouse/pull/36682) ([Anton Kozlov](https://github.com/tonickkozlov)).
* Improve performance of reading from storage `File` and table functions `file` in case when path has globs and matched directory contains large number of files. [#36647](https://github.com/ClickHouse/ClickHouse/pull/36647) ([Anton Popov](https://github.com/CurtizJ)).
* Apply parallel parsing for input format `HiveText`, which can speed up HiveText parsing by 2x when reading local file. [#36650](https://github.com/ClickHouse/ClickHouse/pull/36650) ([李扬](https://github.com/taiyang-li)).
* The default `HashJoin` is not thread safe for inserting right table's rows and run it in a single thread. When the right table is large, the join process is too slow with low cpu utilization. [#36415](https://github.com/ClickHouse/ClickHouse/pull/36415) ([lgbo](https://github.com/lgbo-ustc)).
* Allow to rewrite `select countDistinct(a) from t` to `select count(1) from (select a from t groupBy a)`. [#35993](https://github.com/ClickHouse/ClickHouse/pull/35993) ([zhanglistar](https://github.com/zhanglistar)).
* Transform OR LIKE chain to multiMatchAny. Will enable once we have more confidence it works. [#34932](https://github.com/ClickHouse/ClickHouse/pull/34932) ([Daniel Kutenin](https://github.com/danlark1)).
* Improve performance of some functions with inlining. [#34544](https://github.com/ClickHouse/ClickHouse/pull/34544) ([Daniel Kutenin](https://github.com/danlark1)).
* Add a branch to avoid unnecessary memcpy in readBig. It improves performance somewhat. [#36095](https://github.com/ClickHouse/ClickHouse/pull/36095) ([jasperzhu](https://github.com/jinjunzh)).
* Implement partial GROUP BY key for optimize_aggregation_in_order. [#35111](https://github.com/ClickHouse/ClickHouse/pull/35111) ([Azat Khuzhin](https://github.com/azat)).

#### Improvement
 
* Show names of erroneous files in case of parsing errors while executing table functions `file`, `s3` and `url`. [#36314](https://github.com/ClickHouse/ClickHouse/pull/36314) ([Anton Popov](https://github.com/CurtizJ)).
* Allowed to increase the number of threads for executing background operations (merges, mutations, moves and fetches) at runtime if they are specified at top level config. [#36425](https://github.com/ClickHouse/ClickHouse/pull/36425) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Now date time conversion functions that generates time before 1970-01-01 00:00:00 with partial hours/minutes timezones will be saturated to zero instead of overflow. This is the continuation of https://github.com/ClickHouse/ClickHouse/pull/29953 which addresses https://github.com/ClickHouse/ClickHouse/pull/29953#discussion_r800550280 . Mark as improvement because it's implementation defined behavior (and very rare case) and we are allowed to break it. [#36656](https://github.com/ClickHouse/ClickHouse/pull/36656) ([Amos Bird](https://github.com/amosbird)).
* Add a warning if someone running clickhouse-server with log level "test". The log level "test" was added recently and cannot be used in production due to inevitable, unavoidable, fatal and life-threatening performance degradation. [#36824](https://github.com/ClickHouse/ClickHouse/pull/36824) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Parse collations in CREATE TABLE, throw exception or ignore. closes [#35892](https://github.com/ClickHouse/ClickHouse/issues/35892). [#36271](https://github.com/ClickHouse/ClickHouse/pull/36271) ([yuuch](https://github.com/yuuch)).
* Option `compatibility_ignore_auto_increment_in_create_table` allows ignoring `AUTO_INCREMENT` keyword in a column declaration to simplify migration from MySQL. [#37178](https://github.com/ClickHouse/ClickHouse/pull/37178) ([Igor Nikonov](https://github.com/devcrafter)).
* Add aliases `JSONLines` and `NDJSON` for `JSONEachRow`. Closes [#36303](https://github.com/ClickHouse/ClickHouse/issues/36303). [#36327](https://github.com/ClickHouse/ClickHouse/pull/36327) ([flynn](https://github.com/ucasfl)).
* Limit the max partitions could be queried for each hive table. Avoid resource overruns. [#37281](https://github.com/ClickHouse/ClickHouse/pull/37281) ([lgbo](https://github.com/lgbo-ustc)).
* Added implicit cast for `h3kRing` function second argument to improve usability. Closes [#35432](https://github.com/ClickHouse/ClickHouse/issues/35432). [#37189](https://github.com/ClickHouse/ClickHouse/pull/37189) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix progress indication for `INSERT SELECT` in `clickhouse-local` for any query and for file progress in client, more correct file progress. [#37075](https://github.com/ClickHouse/ClickHouse/pull/37075) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix bug which can lead to forgotten outdated parts in MergeTree table engines family in case of filesystem failures during parts removal. Before fix they will be removed only after first server restart. [#37014](https://github.com/ClickHouse/ClickHouse/pull/37014) ([alesapin](https://github.com/alesapin)).
* Implemented a new mode of handling row policies which can be enabled in the main configuration which enables users without permissive row policies to read rows. [#36997](https://github.com/ClickHouse/ClickHouse/pull/36997) ([Vitaly Baranov](https://github.com/vitlibar)).
* Play UI: Nullable numbers will be aligned to the right in table cells. This closes [#36982](https://github.com/ClickHouse/ClickHouse/issues/36982). [#36988](https://github.com/ClickHouse/ClickHouse/pull/36988) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Play UI: If there is one row in result and more than a few columns, display the result vertically. Continuation of [#36811](https://github.com/ClickHouse/ClickHouse/issues/36811). [#36842](https://github.com/ClickHouse/ClickHouse/pull/36842) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Cleanup CSS in Play UI. The pixels are more evenly placed. Better usability for long content in table cells. [#36569](https://github.com/ClickHouse/ClickHouse/pull/36569) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Finalize write buffers in case of exception to avoid doing it in destructors. Hope it fixes: [#36907](https://github.com/ClickHouse/ClickHouse/issues/36907). [#36979](https://github.com/ClickHouse/ClickHouse/pull/36979) ([Kruglov Pavel](https://github.com/Avogar)).
* After [#36425](https://github.com/ClickHouse/ClickHouse/issues/36425) settings like `background_fetches_pool_size` became obsolete and can appear in top level config, but clickhouse throws and exception like `Error updating configuration from '/etc/clickhouse-server/config.xml' config.: Code: 137. DB::Exception: A setting 'background_fetches_pool_size' appeared at top level in config /etc/clickhouse-server/config.xml.` This is fixed. [#36917](https://github.com/ClickHouse/ClickHouse/pull/36917) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Add extra diagnostic info (if applicable) when sending exception to other server. [#36872](https://github.com/ClickHouse/ClickHouse/pull/36872) ([tavplubix](https://github.com/tavplubix)).
* Allow to execute hash functions with arguments of type `Array(Tuple(..))`. [#36812](https://github.com/ClickHouse/ClickHouse/pull/36812) ([Anton Popov](https://github.com/CurtizJ)).
* Added `user_defined_path` config setting. [#36753](https://github.com/ClickHouse/ClickHouse/pull/36753) ([Maksim Kita](https://github.com/kitaisreal)).
* Allow cluster macro in `s3Cluster` table function. [#36726](https://github.com/ClickHouse/ClickHouse/pull/36726) ([Vadim Volodin](https://github.com/PolyProgrammist)).
* Properly cancel INSERT queries in `clickhouse-client`/`clickhouse-local`. [#36710](https://github.com/ClickHouse/ClickHouse/pull/36710) ([Azat Khuzhin](https://github.com/azat)).
* Allow to cancel a query while still keeping a decent query id in `MySQLHandler`. [#36699](https://github.com/ClickHouse/ClickHouse/pull/36699) ([Amos Bird](https://github.com/amosbird)).
* Add `is_all_data_sent` column into `system.processes`, and improve internal testing hardening check based on it. [#36649](https://github.com/ClickHouse/ClickHouse/pull/36649) ([Azat Khuzhin](https://github.com/azat)).
* The metrics about time spent reading from s3 now calculated correctly. Close [#35483](https://github.com/ClickHouse/ClickHouse/issues/35483). [#36572](https://github.com/ClickHouse/ClickHouse/pull/36572) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Allow file descriptors in table function file if it is run in clickhouse-local. [#36562](https://github.com/ClickHouse/ClickHouse/pull/36562) ([wuxiaobai24](https://github.com/wuxiaobai24)).
* Allow names of tuple elements that start from digits. [#36544](https://github.com/ClickHouse/ClickHouse/pull/36544) ([Anton Popov](https://github.com/CurtizJ)).
* Now clickhouse-benchmark can read authentication info from environment variables. [#36497](https://github.com/ClickHouse/ClickHouse/pull/36497) ([Anton Kozlov](https://github.com/tonickkozlov)).
* `clickhouse-keeper` improvement: add support for force recovery which allows you to reconfigure cluster without quorum. [#36258](https://github.com/ClickHouse/ClickHouse/pull/36258) ([Antonio Andelic](https://github.com/antonio2368)).
* Improve schema inference for JSON objects. [#36207](https://github.com/ClickHouse/ClickHouse/pull/36207) ([Kruglov Pavel](https://github.com/Avogar)).
* Refactor code around schema inference with globs. Try next file from glob only if it makes sense (previously we tried next file in case of any error). Also it fixes [#36317](https://github.com/ClickHouse/ClickHouse/issues/36317). [#36205](https://github.com/ClickHouse/ClickHouse/pull/36205) ([Kruglov Pavel](https://github.com/Avogar)).
* Add a separate `CLUSTER` grant (and `access_control_improvements.on_cluster_queries_require_cluster_grant` configuration directive, for backward compatibility, default to `false`). [#35767](https://github.com/ClickHouse/ClickHouse/pull/35767) ([Azat Khuzhin](https://github.com/azat)).
* If the required amount of memory is available before the selected query stopped, all waiting queries continue execution. Now we don't stop any query if memory is freed before the moment when the selected query knows about the cancellation. [#35637](https://github.com/ClickHouse/ClickHouse/pull/35637) ([Dmitry Novik](https://github.com/novikd)).
* Nullables detection in protobuf. In proto3, default values are not sent on the wire. This makes it non-trivial to distinguish between null and default values for Nullable columns. A standard way to deal with this problem is to use Google wrappers to nest the target value within an inner message (see https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/wrappers.proto). In this case, a missing field is interpreted as null value, a field with missing value if interpreted as default value, and a field with regular value is interpreted as regular value. However, ClickHouse interprets Google wrappers as nested columns. We propose to introduce special behaviour to detect Google wrappers and interpret them like in the description above. For example, to serialize values for a Nullable column `test`, we would use `google.protobuf.StringValue test` in our .proto schema. Note that these types are so called "well-known types" in Protobuf, implemented in the library itself. [#35149](https://github.com/ClickHouse/ClickHouse/pull/35149) ([Jakub Kuklis](https://github.com/jkuklis)).
* Added support for specifying `content_type` in predefined and static HTTP handler config. [#34916](https://github.com/ClickHouse/ClickHouse/pull/34916) ([Roman Nikonov](https://github.com/nic11)).
* Warn properly if use clickhouse-client --file without preceeding --external. Close [#34747](https://github.com/ClickHouse/ClickHouse/issues/34747). [#34765](https://github.com/ClickHouse/ClickHouse/pull/34765) ([李扬](https://github.com/taiyang-li)).
* Improve MySQL database engine to compatible with binary(0) dataType. [#37232](https://github.com/ClickHouse/ClickHouse/pull/37232) ([zzsmdfj](https://github.com/zzsmdfj)).
* Improve JSON report of clickhouse-benchmark. [#36473](https://github.com/ClickHouse/ClickHouse/pull/36473) ([Tian Xinhui](https://github.com/xinhuitian)).
* Server might refuse to start if it cannot resolve hostname of external ClickHouse dictionary. It's fixed. Fixes [#36451](https://github.com/ClickHouse/ClickHouse/issues/36451). [#36463](https://github.com/ClickHouse/ClickHouse/pull/36463) ([tavplubix](https://github.com/tavplubix)).

#### Build/Testing/Packaging Improvement

* Now `clickhouse-keeper` for the `x86_64` architecture is statically linked with [musl](https://musl.libc.org/) and doesn't depend on any system libraries. [#31833](https://github.com/ClickHouse/ClickHouse/pull/31833) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* ClickHouse builds for `PowerPC64LE` architecture are now available in universal installation script `curl https://clickhouse.com/ | sh` and by direct link `https://builds.clickhouse.com/master/powerpc64le/clickhouse`. [#37095](https://github.com/ClickHouse/ClickHouse/pull/37095) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Limit PowerPC code generation to Power8 for better compatibility. This closes [#36025](https://github.com/ClickHouse/ClickHouse/issues/36025). [#36529](https://github.com/ClickHouse/ClickHouse/pull/36529) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Simplify performance test. This will give a chance for us to use it. [#36769](https://github.com/ClickHouse/ClickHouse/pull/36769) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fail performance comparison on errors in the report. [#34797](https://github.com/ClickHouse/ClickHouse/pull/34797) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Add ZSTD support for Arrow. This fixes [#35283](https://github.com/ClickHouse/ClickHouse/issues/35283). [#35486](https://github.com/ClickHouse/ClickHouse/pull/35486) ([Sean Lafferty](https://github.com/seanlaff)).

#### Bug Fix

* Extracts Version ID if present from the URI and adds a request to the AWS HTTP URI. Closes [#31221](https://github.com/ClickHouse/ClickHouse/issues/31221). - [x] Extract `Version ID` from URI if present and reassemble without it. - [x] Configure `AWS HTTP URI` object with request. - [x] Unit Tests: [`gtest_s3_uri`](https://github.com/ClickHouse/ClickHouse/blob/2340a6c6849ebc05a8efbf97ba8de3ff9dc0eff4/src/IO/tests/gtest_s3_uri.cpp) - [x] Drop instrumentation commit. [#34571](https://github.com/ClickHouse/ClickHouse/pull/34571) ([Saad Ur Rahman](https://github.com/surahman)).
* Fix system.opentelemetry_span_log attribute.values alias to values instead of keys. [#37275](https://github.com/ClickHouse/ClickHouse/pull/37275) ([Aleksandr Razumov](https://github.com/ernado)).
* Fix Nullable(String) to Nullable(Bool/IPv4/IPv6) conversion Closes [#37221](https://github.com/ClickHouse/ClickHouse/issues/37221). [#37270](https://github.com/ClickHouse/ClickHouse/pull/37270) ([Kruglov Pavel](https://github.com/Avogar)).
* Experimental feature: Fix execution of mutations in tables, in which there exist columns of type `Object`. Using subcolumns of type `Object` in `WHERE` expression of `UPDATE` or `DELETE` queries is now allowed yet, as well as manipulating (`DROP`, `MODIFY`) of separate subcolumns. Fixes [#37205](https://github.com/ClickHouse/ClickHouse/issues/37205). [#37266](https://github.com/ClickHouse/ClickHouse/pull/37266) ([Anton Popov](https://github.com/CurtizJ)).
* Kafka does not need `group.id` on producer stage. In console log you can find Warning that describe this issue: ``` 2022.05.15 17:59:13.270227 [ 137 ] {} <Warning> StorageKafka (topic-name): [rdk:CONFWARN] [thrd:app]: Configuration property group.id is a consumer property and will be ignored by this producer instance ```. [#37228](https://github.com/ClickHouse/ClickHouse/pull/37228) ([Mark Andreev](https://github.com/mrk-andreev)).
* Experimental feature (WindowView): Update `max_fired_watermark ` after blocks actually fired, in case delete data that hasn't been fired yet. [#37225](https://github.com/ClickHouse/ClickHouse/pull/37225) ([vxider](https://github.com/Vxider)).
* Fix "Cannot create column of type Set" for distributed queries with LIMIT BY. [#37193](https://github.com/ClickHouse/ClickHouse/pull/37193) ([Azat Khuzhin](https://github.com/azat)).
* Experimental feature: Now WindowView `WATCH EVENTS` query will not be terminated due to the nonempty Chunk created in `WindowViewSource.h:58`. [#37182](https://github.com/ClickHouse/ClickHouse/pull/37182) ([vxider](https://github.com/Vxider)).
* Enable `enable_global_with_statement` for subqueries, close [#37141](https://github.com/ClickHouse/ClickHouse/issues/37141). [#37166](https://github.com/ClickHouse/ClickHouse/pull/37166) ([Vladimir C](https://github.com/vdimir)).
* Fix implicit cast for optimize_skip_unused_shards_rewrite_in. [#37153](https://github.com/ClickHouse/ClickHouse/pull/37153) ([Azat Khuzhin](https://github.com/azat)).
* The ILIKE function on FixedString columns could have returned wrong results (i.e. match less than it should). [#37117](https://github.com/ClickHouse/ClickHouse/pull/37117) ([Robert Schulze](https://github.com/rschu1ze)).
* Fix `GROUP BY` `AggregateFunction` (i.e. you `GROUP BY` by the column that has `AggregateFunction` type). [#37093](https://github.com/ClickHouse/ClickHouse/pull/37093) ([Azat Khuzhin](https://github.com/azat)).
* Experimental feature: Fix optimize_aggregation_in_order with prefix GROUP BY and *Array aggregate functions. [#37050](https://github.com/ClickHouse/ClickHouse/pull/37050) ([Azat Khuzhin](https://github.com/azat)).
* Fixed performance degradation of some INSERT SELECT queries with implicit aggregation. Fixes [#36792](https://github.com/ClickHouse/ClickHouse/issues/36792). [#37047](https://github.com/ClickHouse/ClickHouse/pull/37047) ([tavplubix](https://github.com/tavplubix)).
* Experimental feature: Fix in-order `GROUP BY` (`optimize_aggregation_in_order=1`) with `*Array` (`groupArrayArray`/...) aggregate functions. [#37046](https://github.com/ClickHouse/ClickHouse/pull/37046) ([Azat Khuzhin](https://github.com/azat)).
* Fix LowCardinality->ArrowDictionary invalid output when type of indexes is not UInt8. Closes [#36832](https://github.com/ClickHouse/ClickHouse/issues/36832). [#37043](https://github.com/ClickHouse/ClickHouse/pull/37043) ([Kruglov Pavel](https://github.com/Avogar)).
* Fixed problem with infs in `quantileTDigest`. Fixes [#32107](https://github.com/ClickHouse/ClickHouse/issues/32107). [#37021](https://github.com/ClickHouse/ClickHouse/pull/37021) ([Vladimir Chebotarev](https://github.com/excitoon)).
* Fix sending external tables data in HedgedConnections with max_parallel_replicas != 1. [#36981](https://github.com/ClickHouse/ClickHouse/pull/36981) ([Kruglov Pavel](https://github.com/Avogar)).
* Fixed logical error on `TRUNCATE` query in `Replicated` database. Fixes [#33747](https://github.com/ClickHouse/ClickHouse/issues/33747). [#36976](https://github.com/ClickHouse/ClickHouse/pull/36976) ([tavplubix](https://github.com/tavplubix)).
* Experimental feature: Fix stuck when dropping source table in WindowView. Closes [#35678](https://github.com/ClickHouse/ClickHouse/issues/35678). [#36967](https://github.com/ClickHouse/ClickHouse/pull/36967) ([vxider](https://github.com/Vxider)).
* Experimental feature (rocksdb cache): Fix issue: [#36671](https://github.com/ClickHouse/ClickHouse/issues/36671). [#36929](https://github.com/ClickHouse/ClickHouse/pull/36929) ([李扬](https://github.com/taiyang-li)).
* Experimental feature: Fix bugs when using multiple columns in WindowView by adding converting actions to make it possible to call`writeIntoWindowView` with a slightly different schema. [#36928](https://github.com/ClickHouse/ClickHouse/pull/36928) ([vxider](https://github.com/Vxider)).
* Fix bug in clickhouse-keeper which can lead to corrupted compressed log files in case of small load and restarts. [#36910](https://github.com/ClickHouse/ClickHouse/pull/36910) ([alesapin](https://github.com/alesapin)).
* Fix incorrect query result when doing constant aggregation. This fixes [#36728](https://github.com/ClickHouse/ClickHouse/issues/36728) . [#36888](https://github.com/ClickHouse/ClickHouse/pull/36888) ([Amos Bird](https://github.com/amosbird)).
* Experimental feature: Fix `current_size` count in cache. [#36887](https://github.com/ClickHouse/ClickHouse/pull/36887) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Experimental feature: Fix fire in window view with hop window [#34044](https://github.com/ClickHouse/ClickHouse/issues/34044). [#36861](https://github.com/ClickHouse/ClickHouse/pull/36861) ([vxider](https://github.com/Vxider)).
* Experimental feature: Fix incorrect cast in cached buffer from remote fs. [#36809](https://github.com/ClickHouse/ClickHouse/pull/36809) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix creation of tables with `flatten_nested = 0`. Previously unflattened `Nested` columns could be flattened after server restart. [#36803](https://github.com/ClickHouse/ClickHouse/pull/36803) ([Anton Popov](https://github.com/CurtizJ)).
* Fix some issues with async reads from remote filesystem which happened when reading low cardinality. [#36763](https://github.com/ClickHouse/ClickHouse/pull/36763) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Experimental feature: Fix insertion to columns of type `Object` from multiple files, e.g. via table function `file` with globs. [#36762](https://github.com/ClickHouse/ClickHouse/pull/36762) ([Anton Popov](https://github.com/CurtizJ)).
* Fix timeouts in Hedged requests. Connection hang right after sending remote query could lead to eternal waiting. [#36749](https://github.com/ClickHouse/ClickHouse/pull/36749) ([Kruglov Pavel](https://github.com/Avogar)).
* Experimental feature: Fix a bug of `groupBitmapAndState`/`groupBitmapOrState`/`groupBitmapXorState` on distributed table. [#36739](https://github.com/ClickHouse/ClickHouse/pull/36739) ([Zhang Yifan](https://github.com/zhangyifan27)).
* Experimental feature: During the [test](https://s3.amazonaws.com/clickhouse-test-reports/36376/1cb1c7275cb53769ab826772db9b71361bb3e413/stress_test__thread__actions_/clickhouse-server.clean.log) in [PR](https://github.com/ClickHouse/ClickHouse/pull/36376), I found that the one cache class was initialized twice, it throws a exception. Although the cause of this problem is not clear, there should be code logic of repeatedly loading disk in ClickHouse, so we need to make special judgment for this situation. [#36737](https://github.com/ClickHouse/ClickHouse/pull/36737) ([Han Shukai](https://github.com/KinderRiven)).
* Fix vertical merges in wide parts. Previously an exception `There is no column` can be thrown during merge. [#36707](https://github.com/ClickHouse/ClickHouse/pull/36707) ([Anton Popov](https://github.com/CurtizJ)).
* Fix server reload on port change (do not wait for current connections from query context). [#36700](https://github.com/ClickHouse/ClickHouse/pull/36700) ([Azat Khuzhin](https://github.com/azat)).
* Experimental feature: In the previous [PR](https://github.com/ClickHouse/ClickHouse/pull/36376), I found that testing (stateless tests, flaky check (address, actions)) is timeout. Moreover, testing locally can also trigger unstable system deadlocks. This problem still exists when using the latest source code of master. [#36697](https://github.com/ClickHouse/ClickHouse/pull/36697) ([Han Shukai](https://github.com/KinderRiven)).
* Experimental feature: Fix server restart if cache configuration changed. [#36685](https://github.com/ClickHouse/ClickHouse/pull/36685) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix possible heap-use-after-free in schema inference. Closes [#36661](https://github.com/ClickHouse/ClickHouse/issues/36661). [#36679](https://github.com/ClickHouse/ClickHouse/pull/36679) ([Kruglov Pavel](https://github.com/Avogar)).
* Fixed parsing of query settings in `CREATE` query when engine is not specified. Fixes https://github.com/ClickHouse/ClickHouse/pull/34187#issuecomment-1103812419. [#36642](https://github.com/ClickHouse/ClickHouse/pull/36642) ([tavplubix](https://github.com/tavplubix)).
* Experimental feature: Fix merges of wide parts with type `Object`. [#36637](https://github.com/ClickHouse/ClickHouse/pull/36637) ([Anton Popov](https://github.com/CurtizJ)).
* Fix format crash when default expression follow EPHEMERAL not literal. Closes [#36618](https://github.com/ClickHouse/ClickHouse/issues/36618). [#36633](https://github.com/ClickHouse/ClickHouse/pull/36633) ([flynn](https://github.com/ucasfl)).
* Fix `Missing column` exception which could happen while using `INTERPOLATE` with `ENGINE = MergeTree` table. [#36549](https://github.com/ClickHouse/ClickHouse/pull/36549) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Fix potential error with literals in `WHERE` for join queries. Close [#36279](https://github.com/ClickHouse/ClickHouse/issues/36279). [#36542](https://github.com/ClickHouse/ClickHouse/pull/36542) ([Vladimir C](https://github.com/vdimir)).
* Fix offset update ReadBufferFromEncryptedFile, which could cause undefined behaviour. [#36493](https://github.com/ClickHouse/ClickHouse/pull/36493) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix hostname sanity checks for Keeper cluster configuration. Add `keeper_server.host_checks_enabled` config to enable/disable those checks. [#36492](https://github.com/ClickHouse/ClickHouse/pull/36492) ([Antonio Andelic](https://github.com/antonio2368)).
* Fix usage of executable user defined functions in GROUP BY. Before executable user defined functions cannot be used as expressions in GROUP BY. Closes [#36448](https://github.com/ClickHouse/ClickHouse/issues/36448). [#36486](https://github.com/ClickHouse/ClickHouse/pull/36486) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix possible exception with unknown packet from server in client. [#36481](https://github.com/ClickHouse/ClickHouse/pull/36481) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Experimental feature (please never use `system.session_log`, it is going to be removed): Add missing enum values in system.session_log table. Closes [#36474](https://github.com/ClickHouse/ClickHouse/issues/36474). [#36480](https://github.com/ClickHouse/ClickHouse/pull/36480) ([Memo](https://github.com/Joeywzr)).
* Fix bug in s3Cluster schema inference that let to the fact that not all data was read in the select from s3Cluster. The bug appeared in https://github.com/ClickHouse/ClickHouse/pull/35544. [#36434](https://github.com/ClickHouse/ClickHouse/pull/36434) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix nullptr dereference in JOIN and COLUMNS matcher. This fixes [#36416](https://github.com/ClickHouse/ClickHouse/issues/36416). This is for https://github.com/ClickHouse/ClickHouse/pull/36417. [#36430](https://github.com/ClickHouse/ClickHouse/pull/36430) ([Amos Bird](https://github.com/amosbird)).
* Fix dictionary reload for `ClickHouseDictionarySource` if it contains scalar subqueries. [#36390](https://github.com/ClickHouse/ClickHouse/pull/36390) ([lthaooo](https://github.com/lthaooo)).
* Fix assertion in JOIN, close [#36199](https://github.com/ClickHouse/ClickHouse/issues/36199). [#36201](https://github.com/ClickHouse/ClickHouse/pull/36201) ([Vladimir C](https://github.com/vdimir)).
* Queries with aliases inside special operators returned parsing error (was broken in 22.1). Example: `SELECT substring('test' AS t, 1, 1)`. [#36167](https://github.com/ClickHouse/ClickHouse/pull/36167) ([Maksim Kita](https://github.com/kitaisreal)).
* Experimental feature: Fix insertion of complex JSONs with nested arrays to columns of type `Object`. [#36077](https://github.com/ClickHouse/ClickHouse/pull/36077) ([Anton Popov](https://github.com/CurtizJ)).
* Fix ALTER DROP COLUMN of nested column with compact parts (i.e. `ALTER TABLE x DROP COLUMN n`, when there is column `n.d`). [#35797](https://github.com/ClickHouse/ClickHouse/pull/35797) ([Azat Khuzhin](https://github.com/azat)).
* Fix substring function range error length when `offset` and `length` is negative constant and `s` is not constant. [#33861](https://github.com/ClickHouse/ClickHouse/pull/33861) ([RogerYK](https://github.com/RogerYK)).


### <a id="224"></a> ClickHouse release 22.4, 2022-04-19

#### Backward Incompatible Change

* Do not allow SETTINGS after FORMAT for INSERT queries (there is compatibility setting `allow_settings_after_format_in_insert` to accept such queries, but it is turned OFF by default). [#35883](https://github.com/ClickHouse/ClickHouse/pull/35883) ([Azat Khuzhin](https://github.com/azat)).
* Function `yandexConsistentHash` (consistent hashing algorithm by Konstantin "kostik" Oblakov) is renamed to `kostikConsistentHash`. The old name is left as an alias for compatibility. Although this change is backward compatible, we may remove the alias in subsequent releases, that's why it's recommended to update the usages of this function in your apps. [#35553](https://github.com/ClickHouse/ClickHouse/pull/35553) ([Alexey Milovidov](https://github.com/alexey-milovidov)).

#### New Feature

* Added INTERPOLATE extension to the ORDER BY ... WITH FILL. Closes [#34903](https://github.com/ClickHouse/ClickHouse/issues/34903). [#35349](https://github.com/ClickHouse/ClickHouse/pull/35349) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Profiling on Processors level (under `log_processors_profiles` setting, ClickHouse will write time that processor spent during execution/waiting for data to `system.processors_profile_log` table). [#34355](https://github.com/ClickHouse/ClickHouse/pull/34355) ([Azat Khuzhin](https://github.com/azat)).
* Added functions makeDate(year, month, day), makeDate32(year, month, day). [#35628](https://github.com/ClickHouse/ClickHouse/pull/35628) ([Alexander Gololobov](https://github.com/davenger)). Implementation of makeDateTime() and makeDateTIme64(). [#35934](https://github.com/ClickHouse/ClickHouse/pull/35934) ([Alexander Gololobov](https://github.com/davenger)).
* Support new type of quota `WRITTEN BYTES` to limit amount of written bytes during insert queries. [#35736](https://github.com/ClickHouse/ClickHouse/pull/35736) ([Anton Popov](https://github.com/CurtizJ)).
* Added function `flattenTuple`. It receives nested named `Tuple` as an argument and returns a flatten `Tuple` which elements are the paths from the original `Tuple`. E.g.: `Tuple(a Int, Tuple(b Int, c Int)) -> Tuple(a Int, b Int, c Int)`. `flattenTuple` can be used to select all paths from type `Object` as separate columns. [#35690](https://github.com/ClickHouse/ClickHouse/pull/35690) ([Anton Popov](https://github.com/CurtizJ)).
* Added functions `arrayFirstOrNull`, `arrayLastOrNull`. Closes [#35238](https://github.com/ClickHouse/ClickHouse/issues/35238). [#35414](https://github.com/ClickHouse/ClickHouse/pull/35414) ([Maksim Kita](https://github.com/kitaisreal)).
* Added functions `minSampleSizeContinous` and `minSampleSizeConversion`. Author [achimbab](https://github.com/achimbab). [#35360](https://github.com/ClickHouse/ClickHouse/pull/35360) ([Maksim Kita](https://github.com/kitaisreal)).
* New functions minSampleSizeContinous and minSampleSizeConversion. [#34354](https://github.com/ClickHouse/ClickHouse/pull/34354) ([achimbab](https://github.com/achimbab)).
* Introduce format `ProtobufList` (all records as repeated messages in out Protobuf). Closes [#16436](https://github.com/ClickHouse/ClickHouse/issues/16436). [#35152](https://github.com/ClickHouse/ClickHouse/pull/35152) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Add `h3PointDistM`, `h3PointDistKm`, `h3PointDistRads`, `h3GetRes0Indexes`, `h3GetPentagonIndexes` functions. [#34568](https://github.com/ClickHouse/ClickHouse/pull/34568) ([Bharat Nallan](https://github.com/bharatnc)).
* Add `toLastDayOfMonth` function which rounds up a date or date with time to the last day of the month. [#33501](https://github.com/ClickHouse/ClickHouse/issues/33501). [#34394](https://github.com/ClickHouse/ClickHouse/pull/34394) ([Habibullah Oladepo](https://github.com/holadepo)).
* Added load balancing setting for \[Zoo\]Keeper client. Closes [#29617](https://github.com/ClickHouse/ClickHouse/issues/29617). [#30325](https://github.com/ClickHouse/ClickHouse/pull/30325) ([小路](https://github.com/nicelulu)).
* Add a new kind of row policies named `simple`. Before this PR we had two kinds or row policies: `permissive` and `restrictive`. A `simple` row policy adds a new filter on a table without any side-effects like it was for permissive and restrictive policies. [#35345](https://github.com/ClickHouse/ClickHouse/pull/35345) ([Vitaly Baranov](https://github.com/vitlibar)).
* Added an ability to specify cluster secret in replicated database. [#35333](https://github.com/ClickHouse/ClickHouse/pull/35333) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Added sanity checks on server startup (available memory and disk space, max thread count, etc). [#34566](https://github.com/ClickHouse/ClickHouse/pull/34566) ([Sergei Trifonov](https://github.com/serxa)).
* INTERVAL improvement - can be used with `[MILLI|MICRO|NANO]SECOND`. Added `toStartOf[Milli|Micro|Nano]second()` functions. Added `[add|subtract][Milli|Micro|Nano]seconds()`. [#34353](https://github.com/ClickHouse/ClickHouse/pull/34353) ([Andrey Zvonov](https://github.com/zvonand)).

#### Experimental Feature

* Added support for transactions for simple `MergeTree` tables. This feature is highly experimental and not recommended for production. Part of [#22086](https://github.com/ClickHouse/ClickHouse/issues/22086). [#24258](https://github.com/ClickHouse/ClickHouse/pull/24258) ([tavplubix](https://github.com/tavplubix)).
* Support schema inference for type `Object` in format `JSONEachRow`. Allow to convert columns of type `Map` to columns of type `Object`. [#35629](https://github.com/ClickHouse/ClickHouse/pull/35629) ([Anton Popov](https://github.com/CurtizJ)).
* Allow to write remote FS cache on all write operations. Add `system.remote_filesystem_cache` table. Add `drop remote filesystem cache` query. Add introspection for s3 metadata with `system.remote_data_paths` table. Closes [#34021](https://github.com/ClickHouse/ClickHouse/issues/34021). Add cache option for merges by adding mode `read_from_filesystem_cache_if_exists_otherwise_bypass_cache` (turned on by default for merges and can also be turned on by query setting with the same name). Rename cache related settings (`remote_fs_enable_cache -> enable_filesystem_cache`, etc). [#35475](https://github.com/ClickHouse/ClickHouse/pull/35475) ([Kseniia Sumarokova](https://github.com/kssenii)).
* An option to store parts metadata in RocksDB. Speed up parts loading process of MergeTree to accelerate starting up of clickhouse-server. With this improvement, clickhouse-server was able to decrease starting up time from 75 minutes to 20 seconds, with 700k mergetree parts. [#32928](https://github.com/ClickHouse/ClickHouse/pull/32928) ([李扬](https://github.com/taiyang-li)).

#### Performance Improvement

* A new query plan optimization. Evaluate functions after `ORDER BY` when possible. As an example, for a query `SELECT sipHash64(number) FROM numbers(1e8) ORDER BY number LIMIT 5`, function `sipHash64` would be evaluated after `ORDER BY` and `LIMIT`, which gives ~20x speed up. [#35623](https://github.com/ClickHouse/ClickHouse/pull/35623) ([Nikita Taranov](https://github.com/nickitat)).
* Sizes of hash tables used during aggregation now collected and used in later queries to avoid hash tables resizes. [#33439](https://github.com/ClickHouse/ClickHouse/pull/33439) ([Nikita Taranov](https://github.com/nickitat)).
* Improvement for hasAll function using SIMD instructions (SSE and AVX2). [#27653](https://github.com/ClickHouse/ClickHouse/pull/27653) ([youennL-cs](https://github.com/youennL-cs)). [#35723](https://github.com/ClickHouse/ClickHouse/pull/35723) ([Maksim Kita](https://github.com/kitaisreal)).
* Multiple changes to improve ASOF JOIN performance (1.2 - 1.6x as fast). It also adds support to use big integers. [#34733](https://github.com/ClickHouse/ClickHouse/pull/34733) ([Raúl Marín](https://github.com/Algunenano)).
* Improve performance of ASOF JOIN if key is native integer. [#35525](https://github.com/ClickHouse/ClickHouse/pull/35525) ([Maksim Kita](https://github.com/kitaisreal)).
* Parallelization of multipart upload into S3 storage. [#35343](https://github.com/ClickHouse/ClickHouse/pull/35343) ([Sergei Trifonov](https://github.com/serxa)).
* URL storage engine now downloads multiple chunks in parallel if the endpoint supports HTTP Range. Two additional settings were added, `max_download_threads` and `max_download_buffer_size`, which control maximum number of threads a single query can use to download the file and the maximum number of bytes each thread can process. [#35150](https://github.com/ClickHouse/ClickHouse/pull/35150) ([Antonio Andelic](https://github.com/antonio2368)).
* Use multiple threads to download objects from S3. Downloading is controllable using `max_download_threads` and `max_download_buffer_size` settings. [#35571](https://github.com/ClickHouse/ClickHouse/pull/35571) ([Antonio Andelic](https://github.com/antonio2368)).
* Narrow mutex scope when interacting with HDFS. Related to [#35292](https://github.com/ClickHouse/ClickHouse/issues/35292). [#35646](https://github.com/ClickHouse/ClickHouse/pull/35646) ([shuchaome](https://github.com/shuchaome)).
* Require mutations for per-table TTL only when it had been changed. [#35953](https://github.com/ClickHouse/ClickHouse/pull/35953) ([Azat Khuzhin](https://github.com/azat)).

#### Improvement

* Multiple improvements for schema inference. Use some tweaks and heuristics to determine numbers, strings, arrays, tuples and maps in CSV, TSV and TSVRaw data formats. Add setting `input_format_csv_use_best_effort_in_schema_inference` for CSV format that enables/disables using these heuristics, if it's disabled, we treat everything as string. Add similar setting `input_format_tsv_use_best_effort_in_schema_inference` for TSV/TSVRaw format. These settings are enabled by default. - Add Maps support for schema inference in Values format. - Fix possible segfault in schema inference in Values format. - Allow to skip columns with unsupported types in Arrow/ORC/Parquet formats. Add corresponding settings for it: `input_format_{parquet|orc|arrow}_skip_columns_with_unsupported_types_in_schema_inference`. These settings are disabled by default. - Allow to convert a column with type Null to a Nullable column with all NULL values in Arrow/Parquet formats. - Allow to specify column names in schema inference via setting `column_names_for_schema_inference` for formats that don't contain column names (like CSV, TSV, JSONCompactEachRow, etc) - Fix schema inference in ORC/Arrow/Parquet formats in terms of working with Nullable columns. Previously all inferred types were not Nullable and it blocked reading Nullable columns from data, now it's fixed and all inferred types are always Nullable (because we cannot understand that column is Nullable or not by reading the schema). - Fix schema inference in Template format with CSV escaping rules. [#35582](https://github.com/ClickHouse/ClickHouse/pull/35582) ([Kruglov Pavel](https://github.com/Avogar)).
* Add parallel parsing and schema inference for format `JSONAsObject`. [#35592](https://github.com/ClickHouse/ClickHouse/pull/35592) ([Anton Popov](https://github.com/CurtizJ)).
* Added a support for automatic schema inference to `s3Cluster` table function. Synced the signatures of `s3 ` and `s3Cluster`. [#35544](https://github.com/ClickHouse/ClickHouse/pull/35544) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Added support for schema inference for `hdfsCluster`. [#35602](https://github.com/ClickHouse/ClickHouse/pull/35602) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Add new setting `input_format_json_read_bools_as_numbers` that allows to infer and parse bools as numbers in JSON input formats. It's enabled by default. Suggested by @alexey-milovidov. [#35735](https://github.com/ClickHouse/ClickHouse/pull/35735) ([Kruglov Pavel](https://github.com/Avogar)).
* Improve columns ordering in schema inference for formats TSKV and JSONEachRow, closes [#35640](https://github.com/ClickHouse/ClickHouse/issues/35640). Don't stop schema inference when reading empty row in schema inference for formats TSKV and JSONEachRow. [#35724](https://github.com/ClickHouse/ClickHouse/pull/35724) ([Kruglov Pavel](https://github.com/Avogar)).
* Add settings `input_format_orc_case_insensitive_column_matching`, `input_format_arrow_case_insensitive_column_matching`, and `input_format_parquet_case_insensitive_column_matching` which allows ClickHouse to use case insensitive matching of columns while reading data from ORC, Arrow or Parquet files. [#35459](https://github.com/ClickHouse/ClickHouse/pull/35459) ([Antonio Andelic](https://github.com/antonio2368)).
* Added `is_secure` column to `system.query_log` which denotes if the client is using a secure connection over TCP or HTTP. [#35705](https://github.com/ClickHouse/ClickHouse/pull/35705) ([Antonio Andelic](https://github.com/antonio2368)).
* Now `kafka_num_consumers` can be bigger than amount of physical cores in case of low resource machine (less than 16 cores). [#35926](https://github.com/ClickHouse/ClickHouse/pull/35926) ([alesapin](https://github.com/alesapin)).
* Add some basic metrics to monitor engine=Kafka tables. [#35916](https://github.com/ClickHouse/ClickHouse/pull/35916) ([filimonov](https://github.com/filimonov)).
* Now it's not allowed to `ALTER TABLE ... RESET SETTING` for non-existing settings for MergeTree engines family. Fixes [#35816](https://github.com/ClickHouse/ClickHouse/issues/35816). [#35884](https://github.com/ClickHouse/ClickHouse/pull/35884) ([alesapin](https://github.com/alesapin)).
* Now some `ALTER MODIFY COLUMN` queries for `Arrays` and `Nullable` types can be done at metadata level without mutations. For example, alter from `Array(Enum8('Option1'=1))` to `Array(Enum8('Option1'=1, 'Option2'=2))`. [#35882](https://github.com/ClickHouse/ClickHouse/pull/35882) ([alesapin](https://github.com/alesapin)).
* Added an animation to the hourglass icon to indicate to the user that a query is running. [#35860](https://github.com/ClickHouse/ClickHouse/pull/35860) ([peledni](https://github.com/peledni)).
* support ALTER TABLE t DETACH PARTITION (ALL). [#35794](https://github.com/ClickHouse/ClickHouse/pull/35794) ([awakeljw](https://github.com/awakeljw)).
* Improve projection analysis to optimize trivial queries such as `count()`. [#35788](https://github.com/ClickHouse/ClickHouse/pull/35788) ([Amos Bird](https://github.com/amosbird)).
* Support schema inference for insert select with using `input` table function. Get schema from insertion table instead of inferring it from the data in case of insert select from table functions that support schema inference. Closes [#35639](https://github.com/ClickHouse/ClickHouse/issues/35639). [#35760](https://github.com/ClickHouse/ClickHouse/pull/35760) ([Kruglov Pavel](https://github.com/Avogar)).
* Respect `remote_url_allow_hosts` for Hive tables. [#35743](https://github.com/ClickHouse/ClickHouse/pull/35743) ([李扬](https://github.com/taiyang-li)).
* Implement `send_logs_level` for clickhouse-local. Closes [#35653](https://github.com/ClickHouse/ClickHouse/issues/35653). [#35716](https://github.com/ClickHouse/ClickHouse/pull/35716) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Closes [#35641](https://github.com/ClickHouse/ClickHouse/issues/35641) Allow `EPHEMERAL` columns without explicit default expression. [#35706](https://github.com/ClickHouse/ClickHouse/pull/35706) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Add profile event counter `AsyncInsertBytes` about size of async INSERTs. [#35644](https://github.com/ClickHouse/ClickHouse/pull/35644) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Improve the pipeline description for JOIN. [#35612](https://github.com/ClickHouse/ClickHouse/pull/35612) ([何李夫](https://github.com/helifu)).
* Deduce absolute hdfs config path. [#35572](https://github.com/ClickHouse/ClickHouse/pull/35572) ([李扬](https://github.com/taiyang-li)).
* Improve pasting performance and compatibility of clickhouse-client. This helps [#35501](https://github.com/ClickHouse/ClickHouse/issues/35501). [#35541](https://github.com/ClickHouse/ClickHouse/pull/35541) ([Amos Bird](https://github.com/amosbird)).
* It was possible to get stack overflow in distributed queries if one of the settings `async_socket_for_remote` and `use_hedged_requests` is enabled while parsing very deeply nested data type (at least in debug build). Closes [#35509](https://github.com/ClickHouse/ClickHouse/issues/35509). [#35524](https://github.com/ClickHouse/ClickHouse/pull/35524) ([Kruglov Pavel](https://github.com/Avogar)).
* Add sizes of subcolumns to `system.parts_columns` table. [#35488](https://github.com/ClickHouse/ClickHouse/pull/35488) ([Anton Popov](https://github.com/CurtizJ)).
* Add explicit table info to the scan node of query plan and pipeline. [#35460](https://github.com/ClickHouse/ClickHouse/pull/35460) ([何李夫](https://github.com/helifu)).
* Allow server to bind to low-numbered ports (e.g. 443). ClickHouse installation script will set `cap_net_bind_service` to the binary file. [#35451](https://github.com/ClickHouse/ClickHouse/pull/35451) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix INSERT INTO table FROM INFILE: it did not display the progress bar. [#35429](https://github.com/ClickHouse/ClickHouse/pull/35429) ([xiedeyantu](https://github.com/xiedeyantu)).
* Add arguments `--user`, `--password`, `--host`, `--port` for `clickhouse-diagnostics` tool. [#35422](https://github.com/ClickHouse/ClickHouse/pull/35422) ([李扬](https://github.com/taiyang-li)).
* Support uuid for Postgres engines. Closes [#35384](https://github.com/ClickHouse/ClickHouse/issues/35384). [#35403](https://github.com/ClickHouse/ClickHouse/pull/35403) ([Kseniia Sumarokova](https://github.com/kssenii)).
* For table function `s3cluster` or `HDFSCluster` or `hive`, we can't get right `AccessType` by `StorageFactory::instance().getSourceAccessType(getStorageTypeName())`. This pr fix it. [#35365](https://github.com/ClickHouse/ClickHouse/pull/35365) ([李扬](https://github.com/taiyang-li)).
* Remove `--testmode` option for clickhouse-client, enable it unconditionally. [#35354](https://github.com/ClickHouse/ClickHouse/pull/35354) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Don't allow `wchc` operation (four letter command) for clickhouse-keeper. [#35320](https://github.com/ClickHouse/ClickHouse/pull/35320) ([zhangyuli1](https://github.com/zhangyuli1)).
* Add function `getTypeSerializationStreams`. For a specified type (which is detected from column), it returns an array with all the serialization substream paths. This function is useful mainly for developers. [#35290](https://github.com/ClickHouse/ClickHouse/pull/35290) ([李扬](https://github.com/taiyang-li)).
* If `port` is not specified in cluster configuration, default server port will be used. This closes [#34769](https://github.com/ClickHouse/ClickHouse/issues/34769). [#34772](https://github.com/ClickHouse/ClickHouse/pull/34772) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Use `minmax` index for orc/parquet file in Hive Engine. Related PR: https://github.com/ClickHouse/arrow/pull/10. [#34631](https://github.com/ClickHouse/ClickHouse/pull/34631) ([李扬](https://github.com/taiyang-li)).
* System log tables now allow to specify COMMENT in ENGINE declaration. Closes [#33768](https://github.com/ClickHouse/ClickHouse/issues/33768). [#34536](https://github.com/ClickHouse/ClickHouse/pull/34536) ([Maksim Kita](https://github.com/kitaisreal)).
* Proper support of setting `max_rows_to_read` in case of reading in order of sorting key and specified limit. Previously the exception `Limit for rows or bytes to read exceeded` could be thrown even if query actually requires to read less amount of rows. [#33230](https://github.com/ClickHouse/ClickHouse/pull/33230) ([Anton Popov](https://github.com/CurtizJ)).
* Respect only quota & period from cgroups, ignore shares (which are not really limit the number of the cores which can be used). [#35815](https://github.com/ClickHouse/ClickHouse/pull/35815) ([filimonov](https://github.com/filimonov)).

#### Build/Testing/Packaging Improvement

* Add next batch of randomization settings in functional tests. [#35047](https://github.com/ClickHouse/ClickHouse/pull/35047) ([Kruglov Pavel](https://github.com/Avogar)).
* Add backward compatibility check in stress test. Closes [#25088](https://github.com/ClickHouse/ClickHouse/issues/25088). [#27928](https://github.com/ClickHouse/ClickHouse/pull/27928) ([Kruglov Pavel](https://github.com/Avogar)).
* Migrate package building to `nfpm` - Deprecate `release` script in favor of `packages/build` - Build everything in clickhouse/binary-builder image (cleanup: clickhouse/deb-builder) - Add symbol stripping to cmake (todo: use $prefix/lib/$bin_dir/clickhouse/$binary.debug) - Fix issue with DWARF symbols - Add Alpine APK packages - Rename `alien` to `additional_pkgs`. [#33664](https://github.com/ClickHouse/ClickHouse/pull/33664) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Add a night scan and upload for Coverity. [#34895](https://github.com/ClickHouse/ClickHouse/pull/34895) ([Boris Kuschel](https://github.com/bkuschel)).
* A dedicated small package for `clickhouse-keeper`. [#35308](https://github.com/ClickHouse/ClickHouse/pull/35308) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Running with podman was failing: it complains about specifying the same volume twice. [#35978](https://github.com/ClickHouse/ClickHouse/pull/35978) ([Roman Nikonov](https://github.com/nic11)).
* Minor improvement in contrib/krb5 build configuration. [#35832](https://github.com/ClickHouse/ClickHouse/pull/35832) ([Anton Kozlov](https://github.com/tonickkozlov)).
* Add a label to recognize a building task for every image. [#35583](https://github.com/ClickHouse/ClickHouse/pull/35583) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Apply `black` formatter to python code and add a per-commit check. [#35466](https://github.com/ClickHouse/ClickHouse/pull/35466) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Redo alpine image to use clean Dockerfile. Create a script in tests/ci to build both ubuntu and alpine images. Add clickhouse-keeper image (cc @nikitamikhaylov). Add build check to PullRequestCI. Add a job to a ReleaseCI. Add a job to MasterCI to build and push `clickhouse/clickhouse-server:head` and `clickhouse/clickhouse-keeper:head` images for each merged PR. [#35211](https://github.com/ClickHouse/ClickHouse/pull/35211) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Fix stress-test report in CI, now we upload the runlog with information about started stress tests only once. [#35093](https://github.com/ClickHouse/ClickHouse/pull/35093) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Switch to libcxx / libcxxabi from LLVM 14. [#34906](https://github.com/ClickHouse/ClickHouse/pull/34906) ([Raúl Marín](https://github.com/Algunenano)).
* Update unixodbc to mitigate CVE-2018-7485. Note: this CVE is not relevant for ClickHouse as it implements its own isolation layer for ODBC. [#35943](https://github.com/ClickHouse/ClickHouse/pull/35943) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).

#### Bug Fix

* Added settings `input_format_ipv4_default_on_conversion_error`, `input_format_ipv6_default_on_conversion_error` to allow insert of invalid ip address values as default into tables. Closes [#35726](https://github.com/ClickHouse/ClickHouse/issues/35726). [#35733](https://github.com/ClickHouse/ClickHouse/pull/35733) ([Maksim Kita](https://github.com/kitaisreal)).
* Avoid erasing columns from a block if it doesn't exist while reading data from Hive. [#35393](https://github.com/ClickHouse/ClickHouse/pull/35393) ([lgbo](https://github.com/lgbo-ustc)).
* Add type checking when creating materialized view. Close: [#23684](https://github.com/ClickHouse/ClickHouse/issues/23684). [#24896](https://github.com/ClickHouse/ClickHouse/pull/24896) ([hexiaoting](https://github.com/hexiaoting)).
* Fix formatting of INSERT INFILE queries (missing quotes). [#35886](https://github.com/ClickHouse/ClickHouse/pull/35886) ([Azat Khuzhin](https://github.com/azat)).
* Disable `session_log` because memory safety issue has been found by fuzzing. See [#35714](https://github.com/ClickHouse/ClickHouse/issues/35714). [#35873](https://github.com/ClickHouse/ClickHouse/pull/35873) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Avoid processing per-column TTL multiple times. [#35820](https://github.com/ClickHouse/ClickHouse/pull/35820) ([Azat Khuzhin](https://github.com/azat)).
* Fix inserts to columns of type `Object` in case when there is data related to several partitions in insert query. [#35806](https://github.com/ClickHouse/ClickHouse/pull/35806) ([Anton Popov](https://github.com/CurtizJ)).
* Fix bug in indexes of not presented columns in -WithNames formats that led to error `INCORRECT_NUMBER_OF_COLUMNS ` when the number of columns is more than 256. Closes [#35793](https://github.com/ClickHouse/ClickHouse/issues/35793). [#35803](https://github.com/ClickHouse/ClickHouse/pull/35803) ([Kruglov Pavel](https://github.com/Avogar)).
* Fixes [#35751](https://github.com/ClickHouse/ClickHouse/issues/35751). [#35799](https://github.com/ClickHouse/ClickHouse/pull/35799) ([Nikolay Degterinsky](https://github.com/evillique)).
* Fix for reading from HDFS in Snappy format. [#35771](https://github.com/ClickHouse/ClickHouse/pull/35771) ([shuchaome](https://github.com/shuchaome)).
* Fix bug in conversion from custom types to string that could lead to segfault or unexpected error messages. Closes [#35752](https://github.com/ClickHouse/ClickHouse/issues/35752). [#35755](https://github.com/ClickHouse/ClickHouse/pull/35755) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix any/all (subquery) implementation. Closes [#35489](https://github.com/ClickHouse/ClickHouse/issues/35489). [#35727](https://github.com/ClickHouse/ClickHouse/pull/35727) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix dropping non-empty database in clickhouse-local. Closes [#35692](https://github.com/ClickHouse/ClickHouse/issues/35692). [#35711](https://github.com/ClickHouse/ClickHouse/pull/35711) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix bug in creating materialized view with subquery after server restart. Materialized view was not getting updated after inserts into underlying table after server restart. Closes [#35511](https://github.com/ClickHouse/ClickHouse/issues/35511). [#35691](https://github.com/ClickHouse/ClickHouse/pull/35691) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix possible `Can't adjust last granule` exception while reading subcolumns of experimental type `Object`. [#35687](https://github.com/ClickHouse/ClickHouse/pull/35687) ([Anton Popov](https://github.com/CurtizJ)).
* Enable build with JIT compilation by default. [#35683](https://github.com/ClickHouse/ClickHouse/pull/35683) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix possible loss of subcolumns in experimental type `Object`. [#35682](https://github.com/ClickHouse/ClickHouse/pull/35682) ([Anton Popov](https://github.com/CurtizJ)).
* Fix check ASOF JOIN key nullability, close [#35565](https://github.com/ClickHouse/ClickHouse/issues/35565). [#35674](https://github.com/ClickHouse/ClickHouse/pull/35674) ([Vladimir C](https://github.com/vdimir)).
* Fix part checking logic for parts with projections. Error happened when projection and main part had different types. This is similar to https://github.com/ClickHouse/ClickHouse/pull/33774 . The bug is addressed by @caoyang10. [#35667](https://github.com/ClickHouse/ClickHouse/pull/35667) ([Amos Bird](https://github.com/amosbird)).
* Fix server crash when large number of arguments are passed into `format` function. Please refer to the test file and see how to reproduce the crash. [#35651](https://github.com/ClickHouse/ClickHouse/pull/35651) ([Amos Bird](https://github.com/amosbird)).
* Fix usage of quotas with asynchronous inserts. [#35645](https://github.com/ClickHouse/ClickHouse/pull/35645) ([Anton Popov](https://github.com/CurtizJ)).
* Fix positional arguments with aliases. Closes [#35600](https://github.com/ClickHouse/ClickHouse/issues/35600). [#35620](https://github.com/ClickHouse/ClickHouse/pull/35620) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Check `remote_url_allow_hosts` before schema inference in URL engine Closes [#35064](https://github.com/ClickHouse/ClickHouse/issues/35064). [#35619](https://github.com/ClickHouse/ClickHouse/pull/35619) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix `HashJoin` when columns with `LowCardinality` type are used. This closes [#35548](https://github.com/ClickHouse/ClickHouse/issues/35548). [#35616](https://github.com/ClickHouse/ClickHouse/pull/35616) ([Antonio Andelic](https://github.com/antonio2368)).
* Fix possible segfault in MaterializedPostgreSQL which happened if exception occurred when data, collected in memory, was synced into underlying tables. Closes [#35611](https://github.com/ClickHouse/ClickHouse/issues/35611). [#35614](https://github.com/ClickHouse/ClickHouse/pull/35614) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Setting `database_atomic_wait_for_drop_and_detach_synchronously` worked incorrectly for `ATTACH TABLE` query when previously detached table is still in use, It's fixed. [#35594](https://github.com/ClickHouse/ClickHouse/pull/35594) ([tavplubix](https://github.com/tavplubix)).
* Fix HTTP headers with named collections, add compression_method. Closes [#35273](https://github.com/ClickHouse/ClickHouse/issues/35273). Closes [#35269](https://github.com/ClickHouse/ClickHouse/issues/35269). [#35593](https://github.com/ClickHouse/ClickHouse/pull/35593) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix s3 engine getting virtual columns. Closes [#35411](https://github.com/ClickHouse/ClickHouse/issues/35411). [#35586](https://github.com/ClickHouse/ClickHouse/pull/35586) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fixed return type deduction for `caseWithExpression`. The type of the ELSE branch is now correctly taken into account. [#35576](https://github.com/ClickHouse/ClickHouse/pull/35576) ([Antonio Andelic](https://github.com/antonio2368)).
* Fix parsing of IPv6 addresses longer than 39 characters. Closes [#34022](https://github.com/ClickHouse/ClickHouse/issues/34022). [#35539](https://github.com/ClickHouse/ClickHouse/pull/35539) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix cast into IPv4, IPv6 address in IN section. Fixes [#35528](https://github.com/ClickHouse/ClickHouse/issues/35528). [#35534](https://github.com/ClickHouse/ClickHouse/pull/35534) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix crash during short circuit function evaluation when one of arguments is nullable constant. Closes [#35497](https://github.com/ClickHouse/ClickHouse/issues/35497). Closes [#35496](https://github.com/ClickHouse/ClickHouse/issues/35496). [#35502](https://github.com/ClickHouse/ClickHouse/pull/35502) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix crash for function `throwIf` with constant arguments. [#35500](https://github.com/ClickHouse/ClickHouse/pull/35500) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix bug in Keeper which can lead to unstable client connections. Introduced in [#35031](https://github.com/ClickHouse/ClickHouse/issues/35031). [#35498](https://github.com/ClickHouse/ClickHouse/pull/35498) ([alesapin](https://github.com/alesapin)).
* Fix bug in function `if` when resulting column type differs with resulting data type that led to logical errors like `Logical error: 'Bad cast from type DB::ColumnVector<int> to DB::ColumnVector<long>'.`. Closes [#35367](https://github.com/ClickHouse/ClickHouse/issues/35367). [#35476](https://github.com/ClickHouse/ClickHouse/pull/35476) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix excessive logging when using S3 as backend for MergeTree or as separate table engine/function. Fixes [#30559](https://github.com/ClickHouse/ClickHouse/issues/30559). [#35434](https://github.com/ClickHouse/ClickHouse/pull/35434) ([alesapin](https://github.com/alesapin)).
* Now merges executed with zero copy replication (experimental) will not spam logs with message `Found parts with the same min block and with the same max block as the missing part _ on replica _. Hoping that it will eventually appear as a result of a merge.`. [#35430](https://github.com/ClickHouse/ClickHouse/pull/35430) ([alesapin](https://github.com/alesapin)).
* Skip possible exception if empty chunks appear in GroupingAggregatedTransform. [#35417](https://github.com/ClickHouse/ClickHouse/pull/35417) ([Nikita Taranov](https://github.com/nickitat)).
* Fix working with columns that are not needed in query in Arrow/Parquet/ORC formats, it prevents possible errors like `Unsupported <format> type <type> of an input column <column_name>` when file contains column with unsupported type and we don't use it in query. [#35406](https://github.com/ClickHouse/ClickHouse/pull/35406) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix for local cache for remote filesystem (experimental feature) for high concurrency on corner cases. [#35381](https://github.com/ClickHouse/ClickHouse/pull/35381) ([Kseniia Sumarokova](https://github.com/kssenii)). Fix possible deadlock in cache. [#35378](https://github.com/ClickHouse/ClickHouse/pull/35378) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix partition pruning in case of comparison with constant in `WHERE`. If column and constant had different types, overflow was possible. Query could return an incorrect empty result. This fixes [#35304](https://github.com/ClickHouse/ClickHouse/issues/35304). [#35334](https://github.com/ClickHouse/ClickHouse/pull/35334) ([Amos Bird](https://github.com/amosbird)).
* Fix schema inference for TSKV format while using small max_read_buffer_size. [#35332](https://github.com/ClickHouse/ClickHouse/pull/35332) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix mutations in tables with enabled sparse columns. [#35284](https://github.com/ClickHouse/ClickHouse/pull/35284) ([Anton Popov](https://github.com/CurtizJ)).
* Do not delay final part writing by default (fixes possible `Memory limit exceeded` during `INSERT` by adding `max_insert_delayed_streams_for_parallel_write` with default to 1000 for writes to s3 and disabled as before otherwise). [#34780](https://github.com/ClickHouse/ClickHouse/pull/34780) ([Azat Khuzhin](https://github.com/azat)).


## <a id="223"></a> ClickHouse release v22.3-lts, 2022-03-17

#### Backward Incompatible Change

* Make `arrayCompact` function behave as other higher-order functions: perform compaction not of lambda function results but on the original array. If you're using nontrivial lambda functions in arrayCompact you may restore old behaviour by wrapping `arrayCompact` arguments into `arrayMap`. Closes [#34010](https://github.com/ClickHouse/ClickHouse/issues/34010) [#18535](https://github.com/ClickHouse/ClickHouse/issues/18535) [#14778](https://github.com/ClickHouse/ClickHouse/issues/14778). [#34795](https://github.com/ClickHouse/ClickHouse/pull/34795) ([Alexandre Snarskii](https://github.com/snar)).
* Change implementation specific behavior on overflow of function `toDatetime`. It will be saturated to the nearest min/max supported instant of datetime instead of wraparound. This change is highlighted as "backward incompatible" because someone may unintentionally rely on the old behavior. [#32898](https://github.com/ClickHouse/ClickHouse/pull/32898) ([HaiBo Li](https://github.com/marising)).
* Make function `cast(value, 'IPv4')`, `cast(value, 'IPv6')` behave same as `toIPv4`, `toIPv6` functions. Changed behavior of incorrect IP address passed into functions `toIPv4`,` toIPv6`,  now if invalid IP address passes into this functions exception will be raised, before this function return default value. Added functions `IPv4StringToNumOrDefault`, `IPv4StringToNumOrNull`, `IPv6StringToNumOrDefault`, `IPv6StringOrNull` `toIPv4OrDefault`, `toIPv4OrNull`, `toIPv6OrDefault`, `toIPv6OrNull`. Functions `IPv4StringToNumOrDefault `, `toIPv4OrDefault `, `toIPv6OrDefault ` should be used if previous logic relied on `IPv4StringToNum`, `toIPv4`, `toIPv6` returning default value for invalid address. Added setting `cast_ipv4_ipv6_default_on_conversion_error`, if this setting enabled, then IP address conversion functions will behave as before. Closes [#22825](https://github.com/ClickHouse/ClickHouse/issues/22825). Closes [#5799](https://github.com/ClickHouse/ClickHouse/issues/5799). Closes [#35156](https://github.com/ClickHouse/ClickHouse/issues/35156). [#35240](https://github.com/ClickHouse/ClickHouse/pull/35240) ([Maksim Kita](https://github.com/kitaisreal)).

#### New Feature

* Support for caching data locally for remote filesystems. It can be enabled for `s3` disks. Closes [#28961](https://github.com/ClickHouse/ClickHouse/issues/28961). [#33717](https://github.com/ClickHouse/ClickHouse/pull/33717) ([Kseniia Sumarokova](https://github.com/kssenii)). In the meantime, we enabled the test suite on s3 filesystem and no more known issues exist, so it is started to be production ready.
* Add new table function `hive`. It can be used as follows `hive('<hive metastore url>', '<hive database>', '<hive table name>', '<columns definition>', '<partition columns>')` for example `SELECT * FROM hive('thrift://hivetest:9083', 'test', 'demo', 'id Nullable(String), score Nullable(Int32), day Nullable(String)', 'day')`. [#34946](https://github.com/ClickHouse/ClickHouse/pull/34946) ([lgbo](https://github.com/lgbo-ustc)).
* Support authentication of users connected via SSL by their X.509 certificate. [#31484](https://github.com/ClickHouse/ClickHouse/pull/31484) ([eungenue](https://github.com/eungenue)).
* Support schema inference for inserting into table functions `file`/`hdfs`/`s3`/`url`. [#34732](https://github.com/ClickHouse/ClickHouse/pull/34732) ([Kruglov Pavel](https://github.com/Avogar)).
* Now you can read `system.zookeeper` table without restrictions on path or using `like` expression. This reads can generate quite heavy load for zookeeper so to enable this ability you have to enable setting `allow_unrestricted_reads_from_keeper`. [#34609](https://github.com/ClickHouse/ClickHouse/pull/34609) ([Sergei Trifonov](https://github.com/serxa)).
* Display CPU and memory metrics in clickhouse-local. Close [#34545](https://github.com/ClickHouse/ClickHouse/issues/34545). [#34605](https://github.com/ClickHouse/ClickHouse/pull/34605) ([李扬](https://github.com/taiyang-li)).
* Implement `startsWith` and `endsWith` function for arrays, closes [#33982](https://github.com/ClickHouse/ClickHouse/issues/33982). [#34368](https://github.com/ClickHouse/ClickHouse/pull/34368) ([usurai](https://github.com/usurai)).
* Add three functions for Map data type: 1. `mapReplace(map1, map2)` - replaces values for keys in map1 with the values of the corresponding keys in map2; adds keys from map2 that don't exist in map1. 2. `mapFilter` 3. `mapMap`. mapFilter and mapMap are higher order functions, accepting two arguments, the first argument is a lambda function with k, v pair as arguments, the second argument is a column of type Map. [#33698](https://github.com/ClickHouse/ClickHouse/pull/33698) ([hexiaoting](https://github.com/hexiaoting)).
* Allow getting default user and password for clickhouse-client from the `CLICKHOUSE_USER` and `CLICKHOUSE_PASSWORD` environment variables. Close [#34538](https://github.com/ClickHouse/ClickHouse/issues/34538). [#34947](https://github.com/ClickHouse/ClickHouse/pull/34947) ([DR](https://github.com/freedomDR)).

#### Experimental Feature

* New data type `Object(<schema_format>)`, which supports storing of semi-structured data (for now JSON only). Data is written to such types as string. Then all paths are extracted according to format of semi-structured data and written as separate columns in most optimal types, that can store all their values. Those columns can be queried by names that match paths in source data. E.g `data.key1.key2` or with cast operator `data.key1.key2::Int64`.
* Add `database_replicated_allow_only_replicated_engine` setting. When enabled, it only allowed to only create `Replicated` tables or tables with stateless engines in `Replicated` databases. [#35214](https://github.com/ClickHouse/ClickHouse/pull/35214) ([Nikolai Kochetov](https://github.com/KochetovNicolai)). Note that `Replicated` database is still an experimental feature.

#### Performance Improvement

* Improve performance of insertion into `MergeTree` tables by optimizing sorting. Up to 2x improvement is observed on realistic benchmarks. [#34750](https://github.com/ClickHouse/ClickHouse/pull/34750) ([Maksim Kita](https://github.com/kitaisreal)).
* Columns pruning when reading Parquet, ORC and Arrow files from URL and S3. Closes [#34163](https://github.com/ClickHouse/ClickHouse/issues/34163). [#34849](https://github.com/ClickHouse/ClickHouse/pull/34849) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Columns pruning when reading Parquet, ORC and Arrow files from Hive. [#34954](https://github.com/ClickHouse/ClickHouse/pull/34954) ([lgbo](https://github.com/lgbo-ustc)).
* A bunch of performance optimizations from a performance superhero. Improve performance of processing queries with large `IN` section. Improve performance of `direct` dictionary if its source is `ClickHouse`. Improve performance of `detectCharset `, `detectLanguageUnknown ` functions. [#34888](https://github.com/ClickHouse/ClickHouse/pull/34888) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of `any` aggregate function by using more batching. [#34760](https://github.com/ClickHouse/ClickHouse/pull/34760) ([Raúl Marín](https://github.com/Algunenano)).
* Multiple improvements for performance of `clickhouse-keeper`: less locking [#35010](https://github.com/ClickHouse/ClickHouse/pull/35010) ([zhanglistar](https://github.com/zhanglistar)), lower memory usage by streaming reading and writing of snapshot instead of full copy. [#34584](https://github.com/ClickHouse/ClickHouse/pull/34584) ([zhanglistar](https://github.com/zhanglistar)), optimizing compaction of log store in the RAFT implementation. [#34534](https://github.com/ClickHouse/ClickHouse/pull/34534) ([zhanglistar](https://github.com/zhanglistar)), versioning of the internal data structure [#34486](https://github.com/ClickHouse/ClickHouse/pull/34486) ([zhanglistar](https://github.com/zhanglistar)).

#### Improvement

* Allow asynchronous inserts to table functions. Fixes [#34864](https://github.com/ClickHouse/ClickHouse/issues/34864). [#34866](https://github.com/ClickHouse/ClickHouse/pull/34866) ([Anton Popov](https://github.com/CurtizJ)).
* Implicit type casting of the key argument for functions `dictGetHierarchy`, `dictIsIn`, `dictGetChildren`, `dictGetDescendants`. Closes [#34970](https://github.com/ClickHouse/ClickHouse/issues/34970). [#35027](https://github.com/ClickHouse/ClickHouse/pull/35027) ([Maksim Kita](https://github.com/kitaisreal)).
* `EXPLAIN AST` query can output AST in form of a graph in Graphviz format: `EXPLAIN AST graph = 1 SELECT * FROM system.parts`. [#35173](https://github.com/ClickHouse/ClickHouse/pull/35173) ([李扬](https://github.com/taiyang-li)).
* When large files were written with `s3` table function or table engine, the content type on the files was mistakenly set to `application/xml` due to a bug in the AWS SDK. This closes [#33964](https://github.com/ClickHouse/ClickHouse/issues/33964). [#34433](https://github.com/ClickHouse/ClickHouse/pull/34433) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Change restrictive row policies a bit to make them an easier alternative to permissive policies in easy cases. If for a particular table only restrictive policies exist (without permissive policies) users will be able to see some rows. Also `SHOW CREATE ROW POLICY` will always show `AS permissive` or `AS restrictive` in row policy's definition. [#34596](https://github.com/ClickHouse/ClickHouse/pull/34596) ([Vitaly Baranov](https://github.com/vitlibar)).
* Improve schema inference with globs in File/S3/HDFS/URL engines. Try to use the next path for schema inference in case of error. [#34465](https://github.com/ClickHouse/ClickHouse/pull/34465) ([Kruglov Pavel](https://github.com/Avogar)).
* Play UI now correctly detects the preferred light/dark theme from the OS. [#35068](https://github.com/ClickHouse/ClickHouse/pull/35068) ([peledni](https://github.com/peledni)).
* Added `date_time_input_format = 'best_effort_us'`. Closes [#34799](https://github.com/ClickHouse/ClickHouse/issues/34799). [#34982](https://github.com/ClickHouse/ClickHouse/pull/34982) ([WenYao](https://github.com/Cai-Yao)).
* A new settings called `allow_plaintext_password` and `allow_no_password` are added in server configuration which turn on/off authentication types that can be potentially insecure in some environments. They are allowed by default. [#34738](https://github.com/ClickHouse/ClickHouse/pull/34738) ([Heena Bansal](https://github.com/HeenaBansal2009)).
* Support for `DateTime64` data type in `Arrow` format, closes [#8280](https://github.com/ClickHouse/ClickHouse/issues/8280) and closes [#28574](https://github.com/ClickHouse/ClickHouse/issues/28574). [#34561](https://github.com/ClickHouse/ClickHouse/pull/34561) ([李扬](https://github.com/taiyang-li)).
* Reload `remote_url_allow_hosts` (filtering of outgoing connections) on config update. [#35294](https://github.com/ClickHouse/ClickHouse/pull/35294) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Support `--testmode` parameter for `clickhouse-local`. This parameter enables interpretation of test hints that we use in functional tests. [#35264](https://github.com/ClickHouse/ClickHouse/pull/35264) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Add `distributed_depth` to query log. It is like a more detailed variant of `is_initial_query` [#35207](https://github.com/ClickHouse/ClickHouse/pull/35207) ([李扬](https://github.com/taiyang-li)).
* Respect `remote_url_allow_hosts` for `MySQL` and `PostgreSQL` table functions. [#35191](https://github.com/ClickHouse/ClickHouse/pull/35191) ([Heena Bansal](https://github.com/HeenaBansal2009)).
* Added `disk_name` field to `system.part_log`. [#35178](https://github.com/ClickHouse/ClickHouse/pull/35178) ([Artyom Yurkov](https://github.com/Varinara)).
* Do not retry non-rertiable errors when querying remote URLs. Closes [#35161](https://github.com/ClickHouse/ClickHouse/issues/35161). [#35172](https://github.com/ClickHouse/ClickHouse/pull/35172) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Support distributed INSERT SELECT queries (the setting `parallel_distributed_insert_select`) table function `view()`. [#35132](https://github.com/ClickHouse/ClickHouse/pull/35132) ([Azat Khuzhin](https://github.com/azat)).
* More precise memory tracking during `INSERT` into `Buffer` with `AggregateFunction`. [#35072](https://github.com/ClickHouse/ClickHouse/pull/35072) ([Azat Khuzhin](https://github.com/azat)).
* Avoid division by zero in Query Profiler if Linux kernel has a bug. Closes [#34787](https://github.com/ClickHouse/ClickHouse/issues/34787). [#35032](https://github.com/ClickHouse/ClickHouse/pull/35032) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Add more sanity checks for keeper configuration: now mixing of localhost and non-local servers is not allowed, also add checks for same value of internal raft port and keeper client port. [#35004](https://github.com/ClickHouse/ClickHouse/pull/35004) ([alesapin](https://github.com/alesapin)).
* Currently, if the user changes the settings of the system tables there will be tons of logs and ClickHouse will rename the tables every minute. This fixes [#34929](https://github.com/ClickHouse/ClickHouse/issues/34929). [#34949](https://github.com/ClickHouse/ClickHouse/pull/34949) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Use connection pool for Hive metastore client. [#34940](https://github.com/ClickHouse/ClickHouse/pull/34940) ([lgbo](https://github.com/lgbo-ustc)).
* Ignore per-column `TTL` in `CREATE TABLE AS` if new table engine does not support it (i.e. if the engine is not of `MergeTree` family). [#34938](https://github.com/ClickHouse/ClickHouse/pull/34938) ([Azat Khuzhin](https://github.com/azat)).
* Allow `LowCardinality` strings for `ngrambf_v1`/`tokenbf_v1` indexes. Closes [#21865](https://github.com/ClickHouse/ClickHouse/issues/21865). [#34911](https://github.com/ClickHouse/ClickHouse/pull/34911) ([Lars Hiller Eidnes](https://github.com/larspars)).
* Allow opening empty sqlite db if the file doesn't exist. Closes [#33367](https://github.com/ClickHouse/ClickHouse/issues/33367). [#34907](https://github.com/ClickHouse/ClickHouse/pull/34907) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Implement memory statistics for FreeBSD - this is required for `max_server_memory_usage` to work correctly. [#34902](https://github.com/ClickHouse/ClickHouse/pull/34902) ([Alexandre Snarskii](https://github.com/snar)).
* In previous versions the progress bar in clickhouse-client can jump forward near 50% for no reason. This closes [#34324](https://github.com/ClickHouse/ClickHouse/issues/34324). [#34801](https://github.com/ClickHouse/ClickHouse/pull/34801) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Now `ALTER TABLE DROP COLUMN columnX` queries for `MergeTree` table engines will work instantly when `columnX` is an `ALIAS` column. Fixes [#34660](https://github.com/ClickHouse/ClickHouse/issues/34660). [#34786](https://github.com/ClickHouse/ClickHouse/pull/34786) ([alesapin](https://github.com/alesapin)).
* Show hints when user mistyped the name of a data skipping index. Closes [#29698](https://github.com/ClickHouse/ClickHouse/issues/29698). [#34764](https://github.com/ClickHouse/ClickHouse/pull/34764) ([flynn](https://github.com/ucasfl)).
* Support `remote()`/`cluster()` table functions for `parallel_distributed_insert_select`. [#34728](https://github.com/ClickHouse/ClickHouse/pull/34728) ([Azat Khuzhin](https://github.com/azat)).
* Do not reset logging that configured via `--log-file`/`--errorlog-file` command line options in case of empty configuration in the config file. [#34718](https://github.com/ClickHouse/ClickHouse/pull/34718) ([Amos Bird](https://github.com/amosbird)).
* Extract schema only once on table creation and prevent reading from local files/external sources to extract schema on each server startup. [#34684](https://github.com/ClickHouse/ClickHouse/pull/34684) ([Kruglov Pavel](https://github.com/Avogar)).
* Allow specifying argument names for executable UDFs. This is necessary for formats where argument name is part of serialization, like `Native`, `JSONEachRow`. Closes [#34604](https://github.com/ClickHouse/ClickHouse/issues/34604). [#34653](https://github.com/ClickHouse/ClickHouse/pull/34653) ([Maksim Kita](https://github.com/kitaisreal)).
* `MaterializedMySQL` (experimental feature) now supports `materialized_mysql_tables_list` (a comma-separated list of MySQL database tables, which will be replicated by the MaterializedMySQL database engine. Default value: empty list — means all the tables will be replicated), mentioned at [#32977](https://github.com/ClickHouse/ClickHouse/issues/32977). [#34487](https://github.com/ClickHouse/ClickHouse/pull/34487) ([zzsmdfj](https://github.com/zzsmdfj)).
* Improve OpenTelemetry span logs for INSERT operation on distributed table. [#34480](https://github.com/ClickHouse/ClickHouse/pull/34480) ([Frank Chen](https://github.com/FrankChen021)).
* Make the znode `ctime` and `mtime` consistent between servers in ClickHouse Keeper. [#33441](https://github.com/ClickHouse/ClickHouse/pull/33441) ([小路](https://github.com/nicelulu)).

#### Build/Testing/Packaging Improvement

* Package repository is migrated to JFrog Artifactory (**Mikhail f. Shiryaev**).
* Randomize some settings in functional tests, so more possible combinations of settings will be tested. This is yet another fuzzing method to ensure better test coverage. This closes [#32268](https://github.com/ClickHouse/ClickHouse/issues/32268). [#34092](https://github.com/ClickHouse/ClickHouse/pull/34092) ([Kruglov Pavel](https://github.com/Avogar)).
* Drop PVS-Studio from our CI. [#34680](https://github.com/ClickHouse/ClickHouse/pull/34680) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Add an ability to build stripped binaries with CMake. In previous versions it was performed by dh-tools. [#35196](https://github.com/ClickHouse/ClickHouse/pull/35196) ([alesapin](https://github.com/alesapin)).
* Smaller "fat-free" `clickhouse-keeper` build. [#35031](https://github.com/ClickHouse/ClickHouse/pull/35031) ([alesapin](https://github.com/alesapin)).
* Use @robot-clickhouse as an author and committer for PRs like https://github.com/ClickHouse/ClickHouse/pull/34685. [#34793](https://github.com/ClickHouse/ClickHouse/pull/34793) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Limit DWARF version for debug info by 4 max, because our internal stack symbolizer cannot parse DWARF version 5. This makes sense if you compile ClickHouse with clang-15. [#34777](https://github.com/ClickHouse/ClickHouse/pull/34777) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Remove `clickhouse-test` debian package as unneeded complication. CI use tests from repository and standalone testing via deb package is no longer supported. [#34606](https://github.com/ClickHouse/ClickHouse/pull/34606) ([Ilya Yatsishin](https://github.com/qoega)).

#### Bug Fix (user-visible misbehaviour in official stable or prestable release)

* A fix for HDFS integration: When the inner buffer size is too small, NEED_MORE_INPUT in `HadoopSnappyDecoder` will run multi times (>=3) for one compressed block. This makes the input data be copied into the wrong place in `HadoopSnappyDecoder::buffer`. [#35116](https://github.com/ClickHouse/ClickHouse/pull/35116) ([lgbo](https://github.com/lgbo-ustc)).
* Ignore obsolete grants in ATTACH GRANT statements. This PR fixes [#34815](https://github.com/ClickHouse/ClickHouse/issues/34815). [#34855](https://github.com/ClickHouse/ClickHouse/pull/34855) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix segfault in Postgres database when getting create table query if database was created using named collections. Closes [#35312](https://github.com/ClickHouse/ClickHouse/issues/35312). [#35313](https://github.com/ClickHouse/ClickHouse/pull/35313) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix partial merge join duplicate rows bug, close [#31009](https://github.com/ClickHouse/ClickHouse/issues/31009). [#35311](https://github.com/ClickHouse/ClickHouse/pull/35311) ([Vladimir C](https://github.com/vdimir)).
* Fix possible `Assertion 'position() != working_buffer.end()' failed` while using bzip2 compression with small `max_read_buffer_size` setting value. The bug was found in https://github.com/ClickHouse/ClickHouse/pull/35047. [#35300](https://github.com/ClickHouse/ClickHouse/pull/35300) ([Kruglov Pavel](https://github.com/Avogar)). While using lz4 compression with a small max_read_buffer_size setting value. [#35296](https://github.com/ClickHouse/ClickHouse/pull/35296) ([Kruglov Pavel](https://github.com/Avogar)). While using lzma compression with small `max_read_buffer_size` setting value. [#35295](https://github.com/ClickHouse/ClickHouse/pull/35295) ([Kruglov Pavel](https://github.com/Avogar)). While using `brotli` compression with a small `max_read_buffer_size` setting value. The bug was found in https://github.com/ClickHouse/ClickHouse/pull/35047. [#35281](https://github.com/ClickHouse/ClickHouse/pull/35281) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix possible segfault in `JSONEachRow` schema inference. [#35291](https://github.com/ClickHouse/ClickHouse/pull/35291) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix `CHECK TABLE` query in case when sparse columns are enabled in table. [#35274](https://github.com/ClickHouse/ClickHouse/pull/35274) ([Anton Popov](https://github.com/CurtizJ)).
* Avoid std::terminate in case of exception in reading from remote VFS. [#35257](https://github.com/ClickHouse/ClickHouse/pull/35257) ([Azat Khuzhin](https://github.com/azat)).
* Fix reading port from config, close [#34776](https://github.com/ClickHouse/ClickHouse/issues/34776). [#35193](https://github.com/ClickHouse/ClickHouse/pull/35193) ([Vladimir C](https://github.com/vdimir)).
* Fix error in query with `WITH TOTALS` in case if `HAVING` returned empty result. This fixes [#33711](https://github.com/ClickHouse/ClickHouse/issues/33711). [#35186](https://github.com/ClickHouse/ClickHouse/pull/35186) ([Amos Bird](https://github.com/amosbird)).
* Fix a corner case of `replaceRegexpAll`, close [#35117](https://github.com/ClickHouse/ClickHouse/issues/35117). [#35182](https://github.com/ClickHouse/ClickHouse/pull/35182) ([Vladimir C](https://github.com/vdimir)).
* Schema inference didn't work properly on case of `INSERT INTO FUNCTION s3(...) FROM ...`, it tried to read schema from s3 file instead of from select query. [#35176](https://github.com/ClickHouse/ClickHouse/pull/35176) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix MaterializedPostgreSQL (experimental feature) `table overrides` for partition by, etc. Closes [#35048](https://github.com/ClickHouse/ClickHouse/issues/35048). [#35162](https://github.com/ClickHouse/ClickHouse/pull/35162) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix MaterializedPostgreSQL (experimental feature) adding new table to replication (ATTACH TABLE) after manually removing (DETACH TABLE). Closes [#33800](https://github.com/ClickHouse/ClickHouse/issues/33800). Closes [#34922](https://github.com/ClickHouse/ClickHouse/issues/34922). Closes [#34315](https://github.com/ClickHouse/ClickHouse/issues/34315). [#35158](https://github.com/ClickHouse/ClickHouse/pull/35158) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix partition pruning error when non-monotonic function is used with IN operator. This fixes [#35136](https://github.com/ClickHouse/ClickHouse/issues/35136). [#35146](https://github.com/ClickHouse/ClickHouse/pull/35146) ([Amos Bird](https://github.com/amosbird)).
* Fixed slightly incorrect translation of YAML configs to XML. [#35135](https://github.com/ClickHouse/ClickHouse/pull/35135) ([Miel Donkers](https://github.com/mdonkers)).
* Fix `optimize_skip_unused_shards_rewrite_in` for signed columns and negative values. [#35134](https://github.com/ClickHouse/ClickHouse/pull/35134) ([Azat Khuzhin](https://github.com/azat)).
* The `update_lag` external dictionary configuration option was unusable showing the error message ``Unexpected key `update_lag` in dictionary source configuration``. [#35089](https://github.com/ClickHouse/ClickHouse/pull/35089) ([Jason Chu](https://github.com/1lann)).
* Avoid possible deadlock on server shutdown. [#35081](https://github.com/ClickHouse/ClickHouse/pull/35081) ([Azat Khuzhin](https://github.com/azat)).
* Fix missing alias after function is optimized to a subcolumn when setting `optimize_functions_to_subcolumns` is enabled. Closes [#33798](https://github.com/ClickHouse/ClickHouse/issues/33798). [#35079](https://github.com/ClickHouse/ClickHouse/pull/35079) ([qieqieplus](https://github.com/qieqieplus)).
* Fix reading from `system.asynchronous_inserts` table if there exists asynchronous insert into table function. [#35050](https://github.com/ClickHouse/ClickHouse/pull/35050) ([Anton Popov](https://github.com/CurtizJ)).
* Fix possible exception `Reading for MergeTree family tables must be done with last position boundary` (relevant to operation on remote VFS). Closes [#34979](https://github.com/ClickHouse/ClickHouse/issues/34979). [#35001](https://github.com/ClickHouse/ClickHouse/pull/35001) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix unexpected result when use -State type aggregate function in window frame. [#34999](https://github.com/ClickHouse/ClickHouse/pull/34999) ([metahys](https://github.com/metahys)).
* Fix possible segfault in FileLog (experimental feature). Closes [#30749](https://github.com/ClickHouse/ClickHouse/issues/30749). [#34996](https://github.com/ClickHouse/ClickHouse/pull/34996) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix possible rare error `Cannot push block to port which already has data`. [#34993](https://github.com/ClickHouse/ClickHouse/pull/34993) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix wrong schema inference for unquoted dates in CSV. Closes [#34768](https://github.com/ClickHouse/ClickHouse/issues/34768). [#34961](https://github.com/ClickHouse/ClickHouse/pull/34961) ([Kruglov Pavel](https://github.com/Avogar)).
* Integration with Hive: Fix unexpected result when use `in` in `where` in hive query. [#34945](https://github.com/ClickHouse/ClickHouse/pull/34945) ([lgbo](https://github.com/lgbo-ustc)).
* Avoid busy polling in ClickHouse Keeper while searching for changelog files to delete. [#34931](https://github.com/ClickHouse/ClickHouse/pull/34931) ([Azat Khuzhin](https://github.com/azat)).
* Fix DateTime64 conversion from PostgreSQL. Closes [#33364](https://github.com/ClickHouse/ClickHouse/issues/33364). [#34910](https://github.com/ClickHouse/ClickHouse/pull/34910) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix possible "Part directory doesn't exist" during `INSERT` into MergeTree table backed by VFS over s3. [#34876](https://github.com/ClickHouse/ClickHouse/pull/34876) ([Azat Khuzhin](https://github.com/azat)).
* Support DDLs like CREATE USER to be executed on cross replicated cluster. [#34860](https://github.com/ClickHouse/ClickHouse/pull/34860) ([Jianmei Zhang](https://github.com/zhangjmruc)).
* Fix bugs for multiple columns group by in `WindowView` (experimental feature). [#34859](https://github.com/ClickHouse/ClickHouse/pull/34859) ([vxider](https://github.com/Vxider)).
* Fix possible failures in S2 functions when queries contain const columns. [#34745](https://github.com/ClickHouse/ClickHouse/pull/34745) ([Bharat Nallan](https://github.com/bharatnc)).
* Fix bug for H3 funcs containing const columns which cause queries to fail. [#34743](https://github.com/ClickHouse/ClickHouse/pull/34743) ([Bharat Nallan](https://github.com/bharatnc)).
* Fix `No such file or directory` with enabled `fsync_part_directory` and vertical merge. [#34739](https://github.com/ClickHouse/ClickHouse/pull/34739) ([Azat Khuzhin](https://github.com/azat)).
* Fix serialization/printing for system queries `RELOAD MODEL`, `RELOAD FUNCTION`, `RESTART DISK` when used `ON CLUSTER`. Closes [#34514](https://github.com/ClickHouse/ClickHouse/issues/34514). [#34696](https://github.com/ClickHouse/ClickHouse/pull/34696) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix `allow_experimental_projection_optimization` with `enable_global_with_statement` (before it may lead to `Stack size too large` error in case of multiple expressions in `WITH` clause, and also it executes scalar subqueries again and again, so not it will be more optimal). [#34650](https://github.com/ClickHouse/ClickHouse/pull/34650) ([Azat Khuzhin](https://github.com/azat)).
* Stop to select part for mutate when the other replica has already updated the transaction log for `ReplatedMergeTree` engine. [#34633](https://github.com/ClickHouse/ClickHouse/pull/34633) ([Jianmei Zhang](https://github.com/zhangjmruc)).
* Fix incorrect result of trivial count query when part movement feature is used [#34089](https://github.com/ClickHouse/ClickHouse/issues/34089). [#34385](https://github.com/ClickHouse/ClickHouse/pull/34385) ([nvartolomei](https://github.com/nvartolomei)).
* Fix inconsistency of `max_query_size` limitation in distributed subqueries. [#34078](https://github.com/ClickHouse/ClickHouse/pull/34078) ([Chao Ma](https://github.com/godliness)).


### <a id="222"></a> ClickHouse release v22.2, 2022-02-17

#### Upgrade Notes

* Applying data skipping indexes for queries with FINAL may produce incorrect result. In this release we disabled data skipping indexes by default for queries with FINAL (a new setting `use_skip_indexes_if_final` is introduced and disabled by default). [#34243](https://github.com/ClickHouse/ClickHouse/pull/34243) ([Azat Khuzhin](https://github.com/azat)).

#### New Feature

* Projections are production ready. Set `allow_experimental_projection_optimization` by default and deprecate this setting. [#34456](https://github.com/ClickHouse/ClickHouse/pull/34456) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* An option to create a new files on insert for `File`/`S3`/`HDFS` engines. Allow to overwrite a file in `HDFS`. Throw an exception in attempt to overwrite a file in `S3` by default. Throw an exception in attempt to append data to file in formats that have a suffix (and thus don't support appends, like `Parquet`, `ORC`). Closes [#31640](https://github.com/ClickHouse/ClickHouse/issues/31640) Closes [#31622](https://github.com/ClickHouse/ClickHouse/issues/31622) Closes [#23862](https://github.com/ClickHouse/ClickHouse/issues/23862) Closes [#15022](https://github.com/ClickHouse/ClickHouse/issues/15022) Closes [#16674](https://github.com/ClickHouse/ClickHouse/issues/16674). [#33302](https://github.com/ClickHouse/ClickHouse/pull/33302) ([Kruglov Pavel](https://github.com/Avogar)).
* Add a setting that allows a user to provide own deduplication semantic in `MergeTree`/`ReplicatedMergeTree` If provided, it's used instead of data digest to generate block ID. So, for example, by providing a unique value for the setting in each INSERT statement, the user can avoid the same inserted data being deduplicated. This closes: [#7461](https://github.com/ClickHouse/ClickHouse/issues/7461). [#32304](https://github.com/ClickHouse/ClickHouse/pull/32304) ([Igor Nikonov](https://github.com/devcrafter)).
* Add support of `DEFAULT` keyword for INSERT statements. Closes [#6331](https://github.com/ClickHouse/ClickHouse/issues/6331). [#33141](https://github.com/ClickHouse/ClickHouse/pull/33141) ([Andrii Buriachevskyi](https://github.com/1over)).
* `EPHEMERAL` column specifier is added to `CREATE TABLE` query. Closes [#9436](https://github.com/ClickHouse/ClickHouse/issues/9436). [#34424](https://github.com/ClickHouse/ClickHouse/pull/34424) ([yakov-olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Support `IF EXISTS` clause for `TTL expr TO [DISK|VOLUME] [IF EXISTS] 'xxx'` feature. Parts will be moved to disk or volume only if it exists on replica, so `MOVE TTL` rules will be able to behave differently on replicas according to the existing storage policies. Resolves [#34455](https://github.com/ClickHouse/ClickHouse/issues/34455). [#34504](https://github.com/ClickHouse/ClickHouse/pull/34504) ([Anton Popov](https://github.com/CurtizJ)).
* Allow set default table engine and to create tables without specifying ENGINE. [#34187](https://github.com/ClickHouse/ClickHouse/pull/34187) ([Ilya Yatsishin](https://github.com/qoega)).
* Add table function `format(format_name, data)`. [#34125](https://github.com/ClickHouse/ClickHouse/pull/34125) ([Kruglov Pavel](https://github.com/Avogar)).
* Detect format in `clickhouse-local` by file name even in the case when it is passed to stdin. [#33829](https://github.com/ClickHouse/ClickHouse/pull/33829) ([Kruglov Pavel](https://github.com/Avogar)).
* Add schema inference for `values` table function. Closes [#33811](https://github.com/ClickHouse/ClickHouse/issues/33811). [#34017](https://github.com/ClickHouse/ClickHouse/pull/34017) ([Kruglov Pavel](https://github.com/Avogar)).
* Dynamic reload of server TLS certificates on config reload. Closes [#15764](https://github.com/ClickHouse/ClickHouse/issues/15764). [#15765](https://github.com/ClickHouse/ClickHouse/pull/15765) ([johnskopis](https://github.com/johnskopis)). [#31257](https://github.com/ClickHouse/ClickHouse/pull/31257) ([Filatenkov Artur](https://github.com/FArthur-cmd)).
* Now ReplicatedMergeTree can recover data when some of its disks are broken. [#13544](https://github.com/ClickHouse/ClickHouse/pull/13544) ([Amos Bird](https://github.com/amosbird)).
* Fault-tolerant connections in clickhouse-client: `clickhouse-client ... --host host1 --host host2 --port port2 --host host3 --port port --host host4`. [#34490](https://github.com/ClickHouse/ClickHouse/pull/34490) ([Kruglov Pavel](https://github.com/Avogar)). [#33824](https://github.com/ClickHouse/ClickHouse/pull/33824) ([Filippov Denis](https://github.com/DF5HSE)).
* Add `DEGREES` and `RADIANS` functions for MySQL compatibility. [#33769](https://github.com/ClickHouse/ClickHouse/pull/33769) ([Bharat Nallan](https://github.com/bharatnc)).
* Add `h3ToCenterChild` function. [#33313](https://github.com/ClickHouse/ClickHouse/pull/33313) ([Bharat Nallan](https://github.com/bharatnc)). Add new h3 miscellaneous functions: `edgeLengthKm`,`exactEdgeLengthKm`,`exactEdgeLengthM`,`exactEdgeLengthRads`,`numHexagons`. [#33621](https://github.com/ClickHouse/ClickHouse/pull/33621) ([Bharat Nallan](https://github.com/bharatnc)).
* Add function `bitSlice` to extract bit subsequences from String/FixedString. [#33360](https://github.com/ClickHouse/ClickHouse/pull/33360) ([RogerYK](https://github.com/RogerYK)).
* Implemented `meanZTest` aggregate function. [#33354](https://github.com/ClickHouse/ClickHouse/pull/33354) ([achimbab](https://github.com/achimbab)).
* Add confidence intervals to T-tests aggregate functions. [#33260](https://github.com/ClickHouse/ClickHouse/pull/33260) ([achimbab](https://github.com/achimbab)).
* Add function `addressToLineWithInlines`. Close [#26211](https://github.com/ClickHouse/ClickHouse/issues/26211). [#33467](https://github.com/ClickHouse/ClickHouse/pull/33467) ([SuperDJY](https://github.com/cmsxbc)).
* Added `#!` and `# ` as a recognised start of a single line comment. Closes [#34138](https://github.com/ClickHouse/ClickHouse/issues/34138). [#34230](https://github.com/ClickHouse/ClickHouse/pull/34230) ([Aaron Katz](https://github.com/aaronstephenkatz)).

#### Experimental Feature

* Functions for text classification: language and charset detection. See [#23271](https://github.com/ClickHouse/ClickHouse/issues/23271). [#33314](https://github.com/ClickHouse/ClickHouse/pull/33314) ([Nikolay Degterinsky](https://github.com/evillique)).
* Add memory overcommit to `MemoryTracker`. Added `guaranteed` settings for memory limits which represent soft memory limits. In case when hard memory limit is reached, `MemoryTracker` tries to cancel the most overcommited query. New setting `memory_usage_overcommit_max_wait_microseconds` specifies how long queries may wait another query to stop. Closes [#28375](https://github.com/ClickHouse/ClickHouse/issues/28375). [#31182](https://github.com/ClickHouse/ClickHouse/pull/31182) ([Dmitry Novik](https://github.com/novikd)).
* Enable stream to table join in WindowView. [#33729](https://github.com/ClickHouse/ClickHouse/pull/33729) ([vxider](https://github.com/Vxider)).
* Support `SET`, `YEAR`, `TIME` and `GEOMETRY` data types in `MaterializedMySQL` (experimental feature). Fixes [#18091](https://github.com/ClickHouse/ClickHouse/issues/18091), [#21536](https://github.com/ClickHouse/ClickHouse/issues/21536), [#26361](https://github.com/ClickHouse/ClickHouse/issues/26361). [#33429](https://github.com/ClickHouse/ClickHouse/pull/33429) ([zzsmdfj](https://github.com/zzsmdfj)).
* Fix various issues when projection is enabled by default. Each issue is described in separate commit. This is for [#33678](https://github.com/ClickHouse/ClickHouse/issues/33678) . This fixes [#34273](https://github.com/ClickHouse/ClickHouse/issues/34273). [#34305](https://github.com/ClickHouse/ClickHouse/pull/34305) ([Amos Bird](https://github.com/amosbird)).

#### Performance Improvement

* Support `optimize_read_in_order` if prefix of sorting key is already sorted. E.g. if we have sorting key `ORDER BY (a, b)` in table and query with `WHERE a = const ORDER BY b` clauses, now it will be applied reading in order of sorting key instead of full sort. [#32748](https://github.com/ClickHouse/ClickHouse/pull/32748) ([Anton Popov](https://github.com/CurtizJ)).
* Improve performance of partitioned insert into table functions `URL`, `S3`, `File`, `HDFS`. Closes [#34348](https://github.com/ClickHouse/ClickHouse/issues/34348). [#34510](https://github.com/ClickHouse/ClickHouse/pull/34510) ([Maksim Kita](https://github.com/kitaisreal)).
* Multiple performance improvements of clickhouse-keeper. [#34484](https://github.com/ClickHouse/ClickHouse/pull/34484) [#34587](https://github.com/ClickHouse/ClickHouse/pull/34587) ([zhanglistar](https://github.com/zhanglistar)).
* `FlatDictionary` improve performance of dictionary data load. [#33871](https://github.com/ClickHouse/ClickHouse/pull/33871) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of `mapPopulateSeries` function. Closes [#33944](https://github.com/ClickHouse/ClickHouse/issues/33944). [#34318](https://github.com/ClickHouse/ClickHouse/pull/34318) ([Maksim Kita](https://github.com/kitaisreal)).
* `_file` and `_path` virtual columns (in file-like table engines) are made `LowCardinality` - it will make queries for multiple files faster. Closes [#34300](https://github.com/ClickHouse/ClickHouse/issues/34300). [#34317](https://github.com/ClickHouse/ClickHouse/pull/34317) ([flynn](https://github.com/ucasfl)).
* Speed up loading of data parts. It was not parallelized before: the setting `part_loading_threads` did not have effect. See [#4699](https://github.com/ClickHouse/ClickHouse/issues/4699). [#34310](https://github.com/ClickHouse/ClickHouse/pull/34310) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Improve performance of `LineAsString` format. This closes [#34303](https://github.com/ClickHouse/ClickHouse/issues/34303). [#34306](https://github.com/ClickHouse/ClickHouse/pull/34306) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Optimize `quantilesExact{Low,High}` to use `nth_element` instead of `sort`. [#34287](https://github.com/ClickHouse/ClickHouse/pull/34287) ([Danila Kutenin](https://github.com/danlark1)).
* Slightly improve performance of `Regexp` format. [#34202](https://github.com/ClickHouse/ClickHouse/pull/34202) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Minor improvement for analysis of scalar subqueries. [#34128](https://github.com/ClickHouse/ClickHouse/pull/34128) ([Federico Rodriguez](https://github.com/fedrod)).
* Make ORDER BY tuple almost as fast as ORDER BY columns. We have special optimizations for multiple column ORDER BY: https://github.com/ClickHouse/ClickHouse/pull/10831 . It's beneficial to also apply to tuple columns. [#34060](https://github.com/ClickHouse/ClickHouse/pull/34060) ([Amos Bird](https://github.com/amosbird)).
* Rework and reintroduce the scalar subqueries cache to Materialized Views execution. [#33958](https://github.com/ClickHouse/ClickHouse/pull/33958) ([Raúl Marín](https://github.com/Algunenano)).
* Slightly improve performance of `ORDER BY` by adding x86-64 AVX-512 support for `memcmpSmall` functions to accelerate memory comparison. It works only if you compile ClickHouse by yourself. [#33706](https://github.com/ClickHouse/ClickHouse/pull/33706) ([hanqf-git](https://github.com/hanqf-git)).
* Improve `range_hashed` dictionary performance if for key there are a lot of intervals. Fixes [#23821](https://github.com/ClickHouse/ClickHouse/issues/23821). [#33516](https://github.com/ClickHouse/ClickHouse/pull/33516) ([Maksim Kita](https://github.com/kitaisreal)).
* For inserts and merges into S3, write files in parallel whenever possible (TODO: check if it's merged). [#33291](https://github.com/ClickHouse/ClickHouse/pull/33291) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Improve `clickhouse-keeper` performance and fix several memory leaks in NuRaft library. [#33329](https://github.com/ClickHouse/ClickHouse/pull/33329) ([alesapin](https://github.com/alesapin)).

#### Improvement

* Support asynchronous inserts in `clickhouse-client` for queries with inlined data. [#34267](https://github.com/ClickHouse/ClickHouse/pull/34267) ([Anton Popov](https://github.com/CurtizJ)).
* Functions `dictGet`, `dictHas` implicitly cast key argument to dictionary key structure, if they are different. [#33672](https://github.com/ClickHouse/ClickHouse/pull/33672) ([Maksim Kita](https://github.com/kitaisreal)).
* Improvements for `range_hashed` dictionaries. Improve performance of load time if there are multiple attributes. Allow to create a dictionary without attributes. Added option to specify strategy when intervals `start` and `end` have `Nullable` type `convert_null_range_bound_to_open` by default is `true`. Closes [#29791](https://github.com/ClickHouse/ClickHouse/issues/29791). Allow to specify `Float`, `Decimal`, `DateTime64`, `Int128`, `Int256`, `UInt128`, `UInt256` as range types. `RangeHashedDictionary` added support for range values that extend `Int64` type. Closes [#28322](https://github.com/ClickHouse/ClickHouse/issues/28322). Added option `range_lookup_strategy` to specify range lookup type `min`, `max` by default is `min` . Closes [#21647](https://github.com/ClickHouse/ClickHouse/issues/21647). Fixed allocated bytes calculations. Fixed type name in `system.dictionaries` in case of `ComplexKeyHashedDictionary`. [#33927](https://github.com/ClickHouse/ClickHouse/pull/33927) ([Maksim Kita](https://github.com/kitaisreal)).
* `flat`, `hashed`, `hashed_array` dictionaries now support creating with empty attributes, with support of reading the keys and using `dictHas`. Fixes [#33820](https://github.com/ClickHouse/ClickHouse/issues/33820). [#33918](https://github.com/ClickHouse/ClickHouse/pull/33918) ([Maksim Kita](https://github.com/kitaisreal)).
* Added support for `DateTime64` data type in dictionaries. [#33914](https://github.com/ClickHouse/ClickHouse/pull/33914) ([Maksim Kita](https://github.com/kitaisreal)).
* Allow to write `s3(url, access_key_id, secret_access_key)` (autodetect of data format and table structure, but with explicit credentials). [#34503](https://github.com/ClickHouse/ClickHouse/pull/34503) ([Kruglov Pavel](https://github.com/Avogar)).
* Added sending of the output format back to client like it's done in HTTP protocol as suggested in [#34362](https://github.com/ClickHouse/ClickHouse/issues/34362). Closes [#34362](https://github.com/ClickHouse/ClickHouse/issues/34362). [#34499](https://github.com/ClickHouse/ClickHouse/pull/34499) ([Vitaly Baranov](https://github.com/vitlibar)).
* Send ProfileEvents statistics in case of INSERT SELECT query (to display query metrics in `clickhouse-client` for this type of queries). [#34498](https://github.com/ClickHouse/ClickHouse/pull/34498) ([Dmitry Novik](https://github.com/novikd)).
* Recognize `.jsonl` extension for JSONEachRow format. [#34496](https://github.com/ClickHouse/ClickHouse/pull/34496) ([Kruglov Pavel](https://github.com/Avogar)).
* Improve schema inference in clickhouse-local. Allow to write just `clickhouse-local -q "select * from table" < data.format`. [#34495](https://github.com/ClickHouse/ClickHouse/pull/34495) ([Kruglov Pavel](https://github.com/Avogar)).
* Privileges CREATE/ALTER/DROP ROW POLICY now can be granted on a table or on `database.*` as well as globally `*.*`. [#34489](https://github.com/ClickHouse/ClickHouse/pull/34489) ([Vitaly Baranov](https://github.com/vitlibar)).
* Allow to export arbitrary large files to `s3`. Add two new settings: `s3_upload_part_size_multiply_factor` and `s3_upload_part_size_multiply_parts_count_threshold`. Now each time `s3_upload_part_size_multiply_parts_count_threshold` uploaded to S3 from a single query `s3_min_upload_part_size` multiplied by `s3_upload_part_size_multiply_factor`. Fixes [#34244](https://github.com/ClickHouse/ClickHouse/issues/34244). [#34422](https://github.com/ClickHouse/ClickHouse/pull/34422) ([alesapin](https://github.com/alesapin)).
* Allow to skip not found (404) URLs for globs when using URL storage / table function. Also closes [#34359](https://github.com/ClickHouse/ClickHouse/issues/34359). [#34392](https://github.com/ClickHouse/ClickHouse/pull/34392) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Default input and output formats for `clickhouse-local` that can be overriden by --input-format and --output-format. Close [#30631](https://github.com/ClickHouse/ClickHouse/issues/30631). [#34352](https://github.com/ClickHouse/ClickHouse/pull/34352) ([李扬](https://github.com/taiyang-li)).
* Add options for `clickhouse-format`. Which close [#30528](https://github.com/ClickHouse/ClickHouse/issues/30528) - `max_query_size` - `max_parser_depth`. [#34349](https://github.com/ClickHouse/ClickHouse/pull/34349) ([李扬](https://github.com/taiyang-li)).
* Better handling of pre-inputs before client start. This is for [#34308](https://github.com/ClickHouse/ClickHouse/issues/34308). [#34336](https://github.com/ClickHouse/ClickHouse/pull/34336) ([Amos Bird](https://github.com/amosbird)).
* `REGEXP_MATCHES` and `REGEXP_REPLACE` function aliases for compatibility with PostgreSQL. Close [#30885](https://github.com/ClickHouse/ClickHouse/issues/30885). [#34334](https://github.com/ClickHouse/ClickHouse/pull/34334) ([李扬](https://github.com/taiyang-li)).
* Some servers expect a User-Agent header in their HTTP requests. A `User-Agent` header entry has been added to HTTP requests of the form: User-Agent: ClickHouse/VERSION_STRING. [#34330](https://github.com/ClickHouse/ClickHouse/pull/34330) ([Saad Ur Rahman](https://github.com/surahman)).
* Cancel merges before acquiring table lock for `TRUNCATE` query to avoid `DEADLOCK_AVOIDED` error in some cases. Fixes [#34302](https://github.com/ClickHouse/ClickHouse/issues/34302). [#34304](https://github.com/ClickHouse/ClickHouse/pull/34304) ([tavplubix](https://github.com/tavplubix)).
* Change severity of the "Cancelled merging parts" message in logs, because it's not an error. This closes [#34148](https://github.com/ClickHouse/ClickHouse/issues/34148). [#34232](https://github.com/ClickHouse/ClickHouse/pull/34232) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Add ability to compose PostgreSQL-style cast operator `::` with expressions using `[]` and `.` operators (array and tuple indexing). [#34229](https://github.com/ClickHouse/ClickHouse/pull/34229) ([Nikolay Degterinsky](https://github.com/evillique)).
* Recognize `YYYYMMDD-hhmmss` format in `parseDateTimeBestEffort` function. This closes [#34206](https://github.com/ClickHouse/ClickHouse/issues/34206). [#34208](https://github.com/ClickHouse/ClickHouse/pull/34208) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Allow carriage return in the middle of the line while parsing by `Regexp` format. This closes [#34200](https://github.com/ClickHouse/ClickHouse/issues/34200). [#34205](https://github.com/ClickHouse/ClickHouse/pull/34205) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Allow to parse dictionary's `PRIMARY KEY` as `PRIMARY KEY (id, value)`; previously supported only `PRIMARY KEY id, value`. Closes [#34135](https://github.com/ClickHouse/ClickHouse/issues/34135). [#34141](https://github.com/ClickHouse/ClickHouse/pull/34141) ([Maksim Kita](https://github.com/kitaisreal)).
* An optional argument for `splitByChar` to limit the number of resulting elements. close [#34081](https://github.com/ClickHouse/ClickHouse/issues/34081). [#34140](https://github.com/ClickHouse/ClickHouse/pull/34140) ([李扬](https://github.com/taiyang-li)).
* Improving the experience of multiple line editing for clickhouse-client. This is a follow-up of [#31123](https://github.com/ClickHouse/ClickHouse/pull/31123). [#34114](https://github.com/ClickHouse/ClickHouse/pull/34114) ([Amos Bird](https://github.com/amosbird)).
* Add `UUID` suport in `MsgPack` input/output format. [#34065](https://github.com/ClickHouse/ClickHouse/pull/34065) ([Kruglov Pavel](https://github.com/Avogar)).
* Tracing context (for OpenTelemetry) is now propagated from GRPC client metadata (this change is relevant for GRPC client-server protocol). [#34064](https://github.com/ClickHouse/ClickHouse/pull/34064) ([andremarianiello](https://github.com/andremarianiello)).
* Supports all types of `SYSTEM` queries with `ON CLUSTER` clause. [#34005](https://github.com/ClickHouse/ClickHouse/pull/34005) ([小路](https://github.com/nicelulu)).
* Improve memory accounting for queries that are using less than `max_untracker_memory`. [#34001](https://github.com/ClickHouse/ClickHouse/pull/34001) ([Azat Khuzhin](https://github.com/azat)).
* Fixed UTF-8 string case-insensitive search when lowercase and uppercase characters are represented by different number of bytes. Example is `ẞ` and `ß`. This closes [#7334](https://github.com/ClickHouse/ClickHouse/issues/7334). [#33992](https://github.com/ClickHouse/ClickHouse/pull/33992) ([Harry Lee](https://github.com/HarryLeeIBM)).
* Detect format and schema from stdin in `clickhouse-local`. [#33960](https://github.com/ClickHouse/ClickHouse/pull/33960) ([Kruglov Pavel](https://github.com/Avogar)).
* Correctly handle the case of misconfiguration when multiple disks are using the same path on the filesystem. [#29072](https://github.com/ClickHouse/ClickHouse/issues/29072). [#33905](https://github.com/ClickHouse/ClickHouse/pull/33905) ([zhongyuankai](https://github.com/zhongyuankai)).
* Try every resolved IP address while getting S3 proxy. S3 proxies are rarely used, mostly in Yandex Cloud. [#33862](https://github.com/ClickHouse/ClickHouse/pull/33862) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Support EXPLAIN AST CREATE FUNCTION query `EXPLAIN AST CREATE FUNCTION mycast AS (n) -> cast(n as String)` will return `EXPLAIN AST CREATE FUNCTION mycast AS n -> CAST(n, 'String')`. [#33819](https://github.com/ClickHouse/ClickHouse/pull/33819) ([李扬](https://github.com/taiyang-li)).
* Added support for cast from `Map(Key, Value)` to `Array(Tuple(Key, Value))`. [#33794](https://github.com/ClickHouse/ClickHouse/pull/33794) ([Maksim Kita](https://github.com/kitaisreal)).
* Add some improvements and fixes for `Bool` data type. Fixes [#33244](https://github.com/ClickHouse/ClickHouse/issues/33244). [#33737](https://github.com/ClickHouse/ClickHouse/pull/33737) ([Kruglov Pavel](https://github.com/Avogar)).
* Parse and store OpenTelemetry trace-id in big-endian order. [#33723](https://github.com/ClickHouse/ClickHouse/pull/33723) ([Frank Chen](https://github.com/FrankChen021)).
* Improvement for `fromUnixTimestamp64` family functions.. They now accept any integer value that can be converted to `Int64`. This closes: [#14648](https://github.com/ClickHouse/ClickHouse/issues/14648). [#33505](https://github.com/ClickHouse/ClickHouse/pull/33505) ([Andrey Zvonov](https://github.com/zvonand)).
* Reimplement `_shard_num` from constants (see [#7624](https://github.com/ClickHouse/ClickHouse/issues/7624)) with `shardNum()` function (seee [#27020](https://github.com/ClickHouse/ClickHouse/issues/27020)), to avoid possible issues (like those that had been found in [#16947](https://github.com/ClickHouse/ClickHouse/issues/16947)). [#33392](https://github.com/ClickHouse/ClickHouse/pull/33392) ([Azat Khuzhin](https://github.com/azat)).
* Enable binary arithmetic (plus, minus, multiply, division, least, greatest) between Decimal and Float. [#33355](https://github.com/ClickHouse/ClickHouse/pull/33355) ([flynn](https://github.com/ucasfl)).
* Respect cgroups limits in max_threads autodetection. [#33342](https://github.com/ClickHouse/ClickHouse/pull/33342) ([JaySon](https://github.com/JaySon-Huang)).
* Add new clickhouse-keeper setting `min_session_timeout_ms`. Now clickhouse-keeper will determine client session timeout according to `min_session_timeout_ms` and `session_timeout_ms` settings. [#33288](https://github.com/ClickHouse/ClickHouse/pull/33288) ([JackyWoo](https://github.com/JackyWoo)).
* Added `UUID` data type support for functions `hex` and `bin`. [#32170](https://github.com/ClickHouse/ClickHouse/pull/32170) ([Frank Chen](https://github.com/FrankChen021)).
* Fix reading of subcolumns with dots in their names. In particular fixed reading of `Nested` columns, if their element names contain dots (e.g ```Nested(`keys.name` String, `keys.id` UInt64, values UInt64)```). [#34228](https://github.com/ClickHouse/ClickHouse/pull/34228) ([Anton Popov](https://github.com/CurtizJ)).
* Fixes `parallel_view_processing = 0` not working when inserting into a table using `VALUES`. - Fixes `view_duration_ms` in the `query_views_log` not being set correctly for materialized views. [#34067](https://github.com/ClickHouse/ClickHouse/pull/34067) ([Raúl Marín](https://github.com/Algunenano)).
* Fix parsing tables structure from ZooKeeper: now metadata from ZooKeeper compared with local metadata in canonical form. It helps when canonical function names can change between ClickHouse versions. [#33933](https://github.com/ClickHouse/ClickHouse/pull/33933) ([sunny](https://github.com/sunny19930321)).
* Properly escape some characters for interaction with LDAP. [#33401](https://github.com/ClickHouse/ClickHouse/pull/33401) ([IlyaTsoi](https://github.com/IlyaTsoi)).

#### Build/Testing/Packaging Improvement

* Remove unbundled build support. [#33690](https://github.com/ClickHouse/ClickHouse/pull/33690) ([Azat Khuzhin](https://github.com/azat)).
* Ensure that tests don't depend on the result of non-stable sorting of equal elements. Added equal items ranges randomization in debug after sort to prevent issues when we rely on equal items sort order. [#34393](https://github.com/ClickHouse/ClickHouse/pull/34393) ([Maksim Kita](https://github.com/kitaisreal)).
* Add verbosity to a style check. [#34289](https://github.com/ClickHouse/ClickHouse/pull/34289) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Remove `clickhouse-test` debian package because it's obsolete. [#33948](https://github.com/ClickHouse/ClickHouse/pull/33948) ([Ilya Yatsishin](https://github.com/qoega)).
* Multiple improvements for build system to remove the possibility of occasionally using packages from the OS and to enforce hermetic builds. [#33695](https://github.com/ClickHouse/ClickHouse/pull/33695) ([Amos Bird](https://github.com/amosbird)).

#### Bug Fix (user-visible misbehaviour in official stable or prestable release)

* Fixed the assertion in case of using `allow_experimental_parallel_reading_from_replicas` with `max_parallel_replicas` equals to 1. This fixes [#34525](https://github.com/ClickHouse/ClickHouse/issues/34525). [#34613](https://github.com/ClickHouse/ClickHouse/pull/34613) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Fix rare bug while reading of empty arrays, which could lead to `Data compressed with different methods` error. It can reproduce if you have mostly empty arrays, but not always. And reading is performed in backward direction with ORDER BY ... DESC. This error is extremely unlikely to happen. [#34327](https://github.com/ClickHouse/ClickHouse/pull/34327) ([Anton Popov](https://github.com/CurtizJ)).
* Fix wrong result of `round`/`roundBankers` if integer values of small types are rounded. Closes [#33267](https://github.com/ClickHouse/ClickHouse/issues/33267). [#34562](https://github.com/ClickHouse/ClickHouse/pull/34562) ([李扬](https://github.com/taiyang-li)).
* Sometimes query cancellation did not work immediately when we were reading multiple files from s3 or HDFS. Fixes [#34301](https://github.com/ClickHouse/ClickHouse/issues/34301) Relates to [#34397](https://github.com/ClickHouse/ClickHouse/issues/34397). [#34539](https://github.com/ClickHouse/ClickHouse/pull/34539) ([Dmitry Novik](https://github.com/novikd)).
* Fix exception `Chunk should have AggregatedChunkInfo in MergingAggregatedTransform` (in case of `optimize_aggregation_in_order = 1` and `distributed_aggregation_memory_efficient = 0`). Fixes [#34526](https://github.com/ClickHouse/ClickHouse/issues/34526). [#34532](https://github.com/ClickHouse/ClickHouse/pull/34532) ([Anton Popov](https://github.com/CurtizJ)).
* Fix comparison between integers and floats in index analysis. Previously it could lead to skipping some granules for reading by mistake. Fixes [#34493](https://github.com/ClickHouse/ClickHouse/issues/34493). [#34528](https://github.com/ClickHouse/ClickHouse/pull/34528) ([Anton Popov](https://github.com/CurtizJ)).
* Fix compression support in URL engine. [#34524](https://github.com/ClickHouse/ClickHouse/pull/34524) ([Frank Chen](https://github.com/FrankChen021)).
* Fix possible error 'file_size: Operation not supported' in files' schema autodetection. [#34479](https://github.com/ClickHouse/ClickHouse/pull/34479) ([Kruglov Pavel](https://github.com/Avogar)).
* Fixes possible race with table deletion. [#34416](https://github.com/ClickHouse/ClickHouse/pull/34416) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix possible error `Cannot convert column Function to mask` in short circuit function evaluation. Closes [#34171](https://github.com/ClickHouse/ClickHouse/issues/34171). [#34415](https://github.com/ClickHouse/ClickHouse/pull/34415) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix potential crash when doing schema inference from url source. Closes [#34147](https://github.com/ClickHouse/ClickHouse/issues/34147). [#34405](https://github.com/ClickHouse/ClickHouse/pull/34405) ([Kruglov Pavel](https://github.com/Avogar)).
* For UDFs access permissions were checked for database level instead of global level as it should be. Closes [#34281](https://github.com/ClickHouse/ClickHouse/issues/34281). [#34404](https://github.com/ClickHouse/ClickHouse/pull/34404) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix wrong engine syntax in result of `SHOW CREATE DATABASE` query for databases with engine `Memory`. This closes [#34335](https://github.com/ClickHouse/ClickHouse/issues/34335). [#34345](https://github.com/ClickHouse/ClickHouse/pull/34345) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed a couple of extremely rare race conditions that might lead to broken state of replication queue and "intersecting parts" error. [#34297](https://github.com/ClickHouse/ClickHouse/pull/34297) ([tavplubix](https://github.com/tavplubix)).
* Fix progress bar width. It was incorrectly rounded to integer number of characters. [#34275](https://github.com/ClickHouse/ClickHouse/pull/34275) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix current_user/current_address client information fields for inter-server communication (before this patch current_user/current_address will be preserved from the previous query). [#34263](https://github.com/ClickHouse/ClickHouse/pull/34263) ([Azat Khuzhin](https://github.com/azat)).
* Fix memory leak in case of some Exception during query processing with `optimize_aggregation_in_order=1`. [#34234](https://github.com/ClickHouse/ClickHouse/pull/34234) ([Azat Khuzhin](https://github.com/azat)).
* Fix metric `Query`, which shows the number of executing queries. In last several releases it was always 0. [#34224](https://github.com/ClickHouse/ClickHouse/pull/34224) ([Anton Popov](https://github.com/CurtizJ)).
* Fix schema inference for table runction `s3`. [#34186](https://github.com/ClickHouse/ClickHouse/pull/34186) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix rare and benign race condition in `HDFS`, `S3` and `URL` storage engines which can lead to additional connections. [#34172](https://github.com/ClickHouse/ClickHouse/pull/34172) ([alesapin](https://github.com/alesapin)).
* Fix bug which can rarely lead to error "Cannot read all data" while reading LowCardinality columns of MergeTree table engines family which stores data on remote file system like S3 (virtual filesystem over s3 is an experimental feature that is not ready for production). [#34139](https://github.com/ClickHouse/ClickHouse/pull/34139) ([alesapin](https://github.com/alesapin)).
* Fix inserts to distributed tables in case of a change of native protocol. The last change was in the version 22.1, so there may be some failures of inserts to distributed tables after upgrade to that version. [#34132](https://github.com/ClickHouse/ClickHouse/pull/34132) ([Anton Popov](https://github.com/CurtizJ)).
* Fix possible data race in `File` table engine that was introduced in [#33960](https://github.com/ClickHouse/ClickHouse/pull/33960). Closes [#34111](https://github.com/ClickHouse/ClickHouse/issues/34111). [#34113](https://github.com/ClickHouse/ClickHouse/pull/34113) ([Kruglov Pavel](https://github.com/Avogar)).
* Fixed minor race condition that might cause "intersecting parts" error in extremely rare cases after ZooKeeper connection loss. [#34096](https://github.com/ClickHouse/ClickHouse/pull/34096) ([tavplubix](https://github.com/tavplubix)).
* Fix asynchronous inserts with `Native` format. [#34068](https://github.com/ClickHouse/ClickHouse/pull/34068) ([Anton Popov](https://github.com/CurtizJ)).
* Fix bug which lead to inability for server to start when both replicated access storage and keeper (embedded in clickhouse-server) are used. Introduced two settings for keeper socket timeout instead of settings from default user: `keeper_server.socket_receive_timeout_sec` and `keeper_server.socket_send_timeout_sec`. Fixes [#33973](https://github.com/ClickHouse/ClickHouse/issues/33973). [#33988](https://github.com/ClickHouse/ClickHouse/pull/33988) ([alesapin](https://github.com/alesapin)).
* Fix segfault while parsing ORC file with corrupted footer. Closes [#33797](https://github.com/ClickHouse/ClickHouse/issues/33797). [#33984](https://github.com/ClickHouse/ClickHouse/pull/33984) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix parsing IPv6 from query parameter (prepared statements) and fix IPv6 to string conversion. Closes [#33928](https://github.com/ClickHouse/ClickHouse/issues/33928). [#33971](https://github.com/ClickHouse/ClickHouse/pull/33971) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix crash while reading of nested tuples. Fixes [#33838](https://github.com/ClickHouse/ClickHouse/issues/33838). [#33956](https://github.com/ClickHouse/ClickHouse/pull/33956) ([Anton Popov](https://github.com/CurtizJ)).
* Fix usage of functions `array` and `tuple` with literal arguments in distributed queries. Previously it could lead to `Not found columns` exception. [#33938](https://github.com/ClickHouse/ClickHouse/pull/33938) ([Anton Popov](https://github.com/CurtizJ)).
* Aggregate function combinator `-If` did not correctly process `Nullable` filter argument. This closes [#27073](https://github.com/ClickHouse/ClickHouse/issues/27073). [#33920](https://github.com/ClickHouse/ClickHouse/pull/33920) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix potential race condition when doing remote disk read (virtual filesystem over s3 is an experimental feature that is not ready for production). [#33912](https://github.com/ClickHouse/ClickHouse/pull/33912) ([Amos Bird](https://github.com/amosbird)).
* Fix crash if SQL UDF is created with lambda with non identifier arguments. Closes [#33866](https://github.com/ClickHouse/ClickHouse/issues/33866). [#33868](https://github.com/ClickHouse/ClickHouse/pull/33868) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix usage of sparse columns (which can be enabled by experimental setting `ratio_of_defaults_for_sparse_serialization`). [#33849](https://github.com/ClickHouse/ClickHouse/pull/33849) ([Anton Popov](https://github.com/CurtizJ)).
* Fixed `replica is not readonly` logical error on `SYSTEM RESTORE REPLICA` query when replica is actually readonly. Fixes [#33806](https://github.com/ClickHouse/ClickHouse/issues/33806). [#33847](https://github.com/ClickHouse/ClickHouse/pull/33847) ([tavplubix](https://github.com/tavplubix)).
* Fix memory leak in `clickhouse-keeper` in case of compression is used (default). [#33840](https://github.com/ClickHouse/ClickHouse/pull/33840) ([Azat Khuzhin](https://github.com/azat)).
* Fix index analysis with no common types available. [#33833](https://github.com/ClickHouse/ClickHouse/pull/33833) ([Amos Bird](https://github.com/amosbird)).
* Fix schema inference for `JSONEachRow` and `JSONCompactEachRow`. [#33830](https://github.com/ClickHouse/ClickHouse/pull/33830) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix usage of external dictionaries with `redis` source and large number of keys. [#33804](https://github.com/ClickHouse/ClickHouse/pull/33804) ([Anton Popov](https://github.com/CurtizJ)).
* Fix bug in client that led to 'Connection reset by peer' in server. Closes [#33309](https://github.com/ClickHouse/ClickHouse/issues/33309). [#33790](https://github.com/ClickHouse/ClickHouse/pull/33790) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix parsing query INSERT INTO ... VALUES SETTINGS ... (...), ... [#33776](https://github.com/ClickHouse/ClickHouse/pull/33776) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix bug of check table when creating data part with wide format and projection. [#33774](https://github.com/ClickHouse/ClickHouse/pull/33774) ([李扬](https://github.com/taiyang-li)).
* Fix tiny race between count() and INSERT/merges/... in MergeTree (it is possible to return incorrect number of rows for SELECT with optimize_trivial_count_query). [#33753](https://github.com/ClickHouse/ClickHouse/pull/33753) ([Azat Khuzhin](https://github.com/azat)).
* Throw exception when directory listing request has failed in storage HDFS. [#33724](https://github.com/ClickHouse/ClickHouse/pull/33724) ([LiuNeng](https://github.com/liuneng1994)).
* Fix mutation when table contains projections. This fixes [#33010](https://github.com/ClickHouse/ClickHouse/issues/33010). This fixes [#33275](https://github.com/ClickHouse/ClickHouse/issues/33275). [#33679](https://github.com/ClickHouse/ClickHouse/pull/33679) ([Amos Bird](https://github.com/amosbird)).
* Correctly determine current database if `CREATE TEMPORARY TABLE AS SELECT` is queried inside a named HTTP session. This is a very rare use case. This closes [#8340](https://github.com/ClickHouse/ClickHouse/issues/8340). [#33676](https://github.com/ClickHouse/ClickHouse/pull/33676) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Allow some queries with sorting, LIMIT BY, ARRAY JOIN and lambda functions. This closes [#7462](https://github.com/ClickHouse/ClickHouse/issues/7462). [#33675](https://github.com/ClickHouse/ClickHouse/pull/33675) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix bug in "zero copy replication" (a feature that is under development and should not be used in production) which lead to data duplication in case of TTL move. Fixes [#33643](https://github.com/ClickHouse/ClickHouse/issues/33643). [#33642](https://github.com/ClickHouse/ClickHouse/pull/33642) ([alesapin](https://github.com/alesapin)).
* Fix `Chunk should have AggregatedChunkInfo in GroupingAggregatedTransform` (in case of `optimize_aggregation_in_order = 1`). [#33637](https://github.com/ClickHouse/ClickHouse/pull/33637) ([Azat Khuzhin](https://github.com/azat)).
* Fix error `Bad cast from type ... to DB::DataTypeArray` which may happen when table has `Nested` column with dots in name, and default value is generated for it (e.g. during insert, when column is not listed). Continuation of [#28762](https://github.com/ClickHouse/ClickHouse/issues/28762). [#33588](https://github.com/ClickHouse/ClickHouse/pull/33588) ([Alexey Pavlenko](https://github.com/alexeypavlenko)).
* Export into `lz4` files has been fixed. Closes [#31421](https://github.com/ClickHouse/ClickHouse/issues/31421). [#31862](https://github.com/ClickHouse/ClickHouse/pull/31862) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix potential crash if `group_by_overflow_mode` was set to `any` (approximate GROUP BY) and aggregation was performed by single column of type `LowCardinality`. [#34506](https://github.com/ClickHouse/ClickHouse/pull/34506) ([DR](https://github.com/freedomDR)).
* Fix inserting to temporary tables via gRPC client-server protocol. Fixes [#34347](https://github.com/ClickHouse/ClickHouse/issues/34347), issue `#2`. [#34364](https://github.com/ClickHouse/ClickHouse/pull/34364) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix issue [#19429](https://github.com/ClickHouse/ClickHouse/issues/19429). [#34225](https://github.com/ClickHouse/ClickHouse/pull/34225) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix issue [#18206](https://github.com/ClickHouse/ClickHouse/issues/18206). [#33977](https://github.com/ClickHouse/ClickHouse/pull/33977) ([Vitaly Baranov](https://github.com/vitlibar)).
* This PR allows using multiple LDAP storages in the same list of user directories. It worked earlier but was broken because LDAP tests are disabled (they are part of the testflows tests). [#33574](https://github.com/ClickHouse/ClickHouse/pull/33574) ([Vitaly Baranov](https://github.com/vitlibar)).


### <a id="221"></a> ClickHouse release v22.1, 2022-01-18

#### Upgrade Notes

* The functions `left` and `right` were previously implemented in parser and now full-featured. Distributed queries with `left` or `right` functions without aliases may throw exception if cluster contains different versions of clickhouse-server. If you are upgrading your cluster and encounter this error, you should finish upgrading your cluster to ensure all nodes have the same version. Also you can add aliases (`AS something`) to the columns in your queries to avoid this issue. [#33407](https://github.com/ClickHouse/ClickHouse/pull/33407) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Resource usage by scalar subqueries is fully accounted since this version. With this change, rows read in scalar subqueries are now reported in the query_log. If the scalar subquery is cached (repeated or called for several rows) the rows read are only counted once. This change allows KILLing queries and reporting progress while they are executing scalar subqueries. [#32271](https://github.com/ClickHouse/ClickHouse/pull/32271) ([Raúl Marín](https://github.com/Algunenano)).

#### New Feature

* Implement data schema inference for input formats. Allow to skip structure (or write just `auto`) in table functions `file`, `url`, `s3`, `hdfs` and in parameters of `clickhouse-local` . Allow to skip structure in create query for table engines `File`, `HDFS`, `S3`, `URL`, `Merge`, `Buffer`, `Distributed` and `ReplicatedMergeTree` (if we add new replicas). [#32455](https://github.com/ClickHouse/ClickHouse/pull/32455) ([Kruglov Pavel](https://github.com/Avogar)).
* Detect format by file extension in `file`/`hdfs`/`s3`/`url` table functions and `HDFS`/`S3`/`URL` table engines and also for `SELECT INTO OUTFILE` and `INSERT FROM INFILE` [#33565](https://github.com/ClickHouse/ClickHouse/pull/33565) ([Kruglov Pavel](https://github.com/Avogar)). Close [#30918](https://github.com/ClickHouse/ClickHouse/issues/30918). [#33443](https://github.com/ClickHouse/ClickHouse/pull/33443) ([OnePiece](https://github.com/zhongyuankai)).
* A tool for collecting diagnostics data if you need support. [#33175](https://github.com/ClickHouse/ClickHouse/pull/33175) ([Alexander Burmak](https://github.com/Alex-Burmak)).
* Automatic cluster discovery via Zoo/Keeper. It allows to add replicas to the cluster without changing configuration on every server. [#31442](https://github.com/ClickHouse/ClickHouse/pull/31442) ([vdimir](https://github.com/vdimir)).
* Implement hive table engine to access apache hive from clickhouse. This implements: [#29245](https://github.com/ClickHouse/ClickHouse/issues/29245). [#31104](https://github.com/ClickHouse/ClickHouse/pull/31104) ([taiyang-li](https://github.com/taiyang-li)).
* Add aggregate functions `cramersV`, `cramersVBiasCorrected`, `theilsU` and `contingency`. These functions calculate dependency (measure of association) between categorical values. All these functions are using cross-tab (histogram on pairs) for implementation. You can imagine it like a correlation coefficient but for any discrete values (not necessary numbers). [#33366](https://github.com/ClickHouse/ClickHouse/pull/33366) ([alexey-milovidov](https://github.com/alexey-milovidov)). Initial implementation by [Vanyok-All-is-OK](https://github.com/Vanyok-All-is-OK) and [antikvist](https://github.com/antikvist).
* Added table function `hdfsCluster` which allows processing files from HDFS in parallel from many nodes in a specified cluster, similarly to `s3Cluster`. [#32400](https://github.com/ClickHouse/ClickHouse/pull/32400) ([Zhichang Yu](https://github.com/yuzhichang)).
* Adding support for disks backed by Azure Blob Storage, in a similar way it has been done for disks backed by AWS S3. [#31505](https://github.com/ClickHouse/ClickHouse/pull/31505) ([Jakub Kuklis](https://github.com/jkuklis)).
* Allow `COMMENT` in `CREATE VIEW` (for all VIEW kinds). [#31062](https://github.com/ClickHouse/ClickHouse/pull/31062) ([Vasily Nemkov](https://github.com/Enmk)).
* Dynamically reinitialize listening ports and protocols when configuration changes. [#30549](https://github.com/ClickHouse/ClickHouse/pull/30549) ([Kevin Michel](https://github.com/kmichel-aiven)).
* Added `left`, `right`, `leftUTF8`, `rightUTF8` functions. Fix error in implementation of `substringUTF8` function with negative offset (offset from the end of string). [#33407](https://github.com/ClickHouse/ClickHouse/pull/33407) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Add new functions for `H3` coordinate system: `h3HexAreaKm2`, `h3CellAreaM2`, `h3CellAreaRads2`. [#33479](https://github.com/ClickHouse/ClickHouse/pull/33479) ([Bharat Nallan](https://github.com/bharatnc)).
* Add `MONTHNAME` function. [#33436](https://github.com/ClickHouse/ClickHouse/pull/33436) ([usurai](https://github.com/usurai)).
* Added function `arrayLast`. Closes [#33390](https://github.com/ClickHouse/ClickHouse/issues/33390). [#33415](https://github.com/ClickHouse/ClickHouse/pull/33415) Added function `arrayLastIndex`. [#33465](https://github.com/ClickHouse/ClickHouse/pull/33465) ([Maksim Kita](https://github.com/kitaisreal)).
* Add function `decodeURLFormComponent` slightly different to `decodeURLComponent`. Close [#10298](https://github.com/ClickHouse/ClickHouse/issues/10298). [#33451](https://github.com/ClickHouse/ClickHouse/pull/33451) ([SuperDJY](https://github.com/cmsxbc)).
* Allow to split `GraphiteMergeTree` rollup rules for plain/tagged metrics (optional rule_type field). [#33494](https://github.com/ClickHouse/ClickHouse/pull/33494) ([Michail Safronov](https://github.com/msaf1980)).


#### Performance Improvement

* Support moving conditions to `PREWHERE` (setting `optimize_move_to_prewhere`) for tables of `Merge` engine if its all underlying tables supports `PREWHERE`. [#33300](https://github.com/ClickHouse/ClickHouse/pull/33300) ([Anton Popov](https://github.com/CurtizJ)).
* More efficient handling of globs for URL storage. Now you can easily query million URLs in parallel with retries. Closes [#32866](https://github.com/ClickHouse/ClickHouse/issues/32866). [#32907](https://github.com/ClickHouse/ClickHouse/pull/32907) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Avoid exponential backtracking in parser. This closes [#20158](https://github.com/ClickHouse/ClickHouse/issues/20158). [#33481](https://github.com/ClickHouse/ClickHouse/pull/33481) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Abuse of `untuple` function was leading to exponential complexity of query analysis (found by fuzzer). This closes [#33297](https://github.com/ClickHouse/ClickHouse/issues/33297). [#33445](https://github.com/ClickHouse/ClickHouse/pull/33445) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Reduce allocated memory for dictionaries with string attributes. [#33466](https://github.com/ClickHouse/ClickHouse/pull/33466) ([Maksim Kita](https://github.com/kitaisreal)).
* Slight performance improvement of `reinterpret` function. [#32587](https://github.com/ClickHouse/ClickHouse/pull/32587) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Non significant change. In extremely rare cases when data part is lost on every replica, after merging of some data parts, the subsequent queries may skip less amount of partitions during partition pruning. This hardly affects anything. [#32220](https://github.com/ClickHouse/ClickHouse/pull/32220) ([Azat Khuzhin](https://github.com/azat)).
* Improve `clickhouse-keeper` writing performance by optimization the size calculation logic. [#32366](https://github.com/ClickHouse/ClickHouse/pull/32366) ([zhanglistar](https://github.com/zhanglistar)).
* Optimize single part projection materialization. This closes [#31669](https://github.com/ClickHouse/ClickHouse/issues/31669). [#31885](https://github.com/ClickHouse/ClickHouse/pull/31885) ([Amos Bird](https://github.com/amosbird)).
* Improve query performance of system tables. [#33312](https://github.com/ClickHouse/ClickHouse/pull/33312) ([OnePiece](https://github.com/zhongyuankai)).
* Optimize selecting of MergeTree parts that can be moved between volumes. [#33225](https://github.com/ClickHouse/ClickHouse/pull/33225) ([OnePiece](https://github.com/zhongyuankai)).
* Fix `sparse_hashed` dict performance with sequential keys (wrong hash function). [#32536](https://github.com/ClickHouse/ClickHouse/pull/32536) ([Azat Khuzhin](https://github.com/azat)).


#### Experimental Feature

* Parallel reading from multiple replicas within a shard during distributed query without using sample key. To enable this, set `allow_experimental_parallel_reading_from_replicas = 1` and `max_parallel_replicas` to any number. This closes [#26748](https://github.com/ClickHouse/ClickHouse/issues/26748). [#29279](https://github.com/ClickHouse/ClickHouse/pull/29279) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Implemented sparse serialization. It can reduce usage of disk space and improve performance of some queries for columns, which contain a lot of default (zero) values. It can be enabled by setting `ratio_for_sparse_serialization`. Sparse serialization will be chosen dynamically for column, if it has ratio of number of default values to number of all values above that threshold. Serialization (default or sparse) will be fixed for every column in part, but may varies between parts. [#22535](https://github.com/ClickHouse/ClickHouse/pull/22535) ([Anton Popov](https://github.com/CurtizJ)).
* Add "TABLE OVERRIDE" feature for customizing MaterializedMySQL table schemas. [#32325](https://github.com/ClickHouse/ClickHouse/pull/32325) ([Stig Bakken](https://github.com/stigsb)).
* Add `EXPLAIN TABLE OVERRIDE` query. [#32836](https://github.com/ClickHouse/ClickHouse/pull/32836) ([Stig Bakken](https://github.com/stigsb)).
* Support TABLE OVERRIDE clause for MaterializedPostgreSQL. RFC: [#31480](https://github.com/ClickHouse/ClickHouse/issues/31480). [#32749](https://github.com/ClickHouse/ClickHouse/pull/32749) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Change ZooKeeper path for zero-copy marks for shared data. Note that "zero-copy replication" is non-production feature (in early stages of development) that you shouldn't use anyway. But in case if you have used it, let you keep in mind this change. [#32061](https://github.com/ClickHouse/ClickHouse/pull/32061) ([ianton-ru](https://github.com/ianton-ru)).
* Events clause support for WINDOW VIEW watch query. [#32607](https://github.com/ClickHouse/ClickHouse/pull/32607) ([vxider](https://github.com/Vxider)).
* Fix ACL with explicit digit hash in `clickhouse-keeper`: now the behavior consistent with ZooKeeper and generated digest is always accepted. [#33249](https://github.com/ClickHouse/ClickHouse/pull/33249) ([小路](https://github.com/nicelulu)). [#33246](https://github.com/ClickHouse/ClickHouse/pull/33246).
* Fix unexpected projection removal when detaching parts. [#32067](https://github.com/ClickHouse/ClickHouse/pull/32067) ([Amos Bird](https://github.com/amosbird)).


#### Improvement

* Now date time conversion functions that generates time before `1970-01-01 00:00:00` will be saturated to zero instead of overflow. [#29953](https://github.com/ClickHouse/ClickHouse/pull/29953) ([Amos Bird](https://github.com/amosbird)). It also fixes a bug in index analysis if date truncation function would yield result before the Unix epoch.
* Always display resource usage (total CPU usage, total RAM usage and max RAM usage per host) in client. [#33271](https://github.com/ClickHouse/ClickHouse/pull/33271) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Improve `Bool` type serialization and deserialization, check the range of values. [#32984](https://github.com/ClickHouse/ClickHouse/pull/32984) ([Kruglov Pavel](https://github.com/Avogar)).
* If an invalid setting is defined using the `SET` query or using the query parameters in the HTTP request, error message will contain suggestions that are similar to the invalid setting string (if any exists). [#32946](https://github.com/ClickHouse/ClickHouse/pull/32946) ([Antonio Andelic](https://github.com/antonio2368)).
* Support hints for mistyped setting names for clickhouse-client and clickhouse-local. Closes [#32237](https://github.com/ClickHouse/ClickHouse/issues/32237). [#32841](https://github.com/ClickHouse/ClickHouse/pull/32841) ([凌涛](https://github.com/lingtaolf)).
* Allow to use virtual columns in Materialized Views. Close [#11210](https://github.com/ClickHouse/ClickHouse/issues/11210). [#33482](https://github.com/ClickHouse/ClickHouse/pull/33482) ([OnePiece](https://github.com/zhongyuankai)).
* Add config to disable IPv6 in clickhouse-keeper if needed. This close [#33381](https://github.com/ClickHouse/ClickHouse/issues/33381). [#33450](https://github.com/ClickHouse/ClickHouse/pull/33450) ([Wu Xueyang](https://github.com/wuxueyang96)).
* Add more info to `system.build_options` about current git revision. [#33431](https://github.com/ClickHouse/ClickHouse/pull/33431) ([taiyang-li](https://github.com/taiyang-li)).
* `clickhouse-local`: track memory under `--max_memory_usage_in_client` option. [#33341](https://github.com/ClickHouse/ClickHouse/pull/33341) ([Azat Khuzhin](https://github.com/azat)).
* Allow negative intervals in function `intervalLengthSum`. Their length will be added as well. This closes [#33323](https://github.com/ClickHouse/ClickHouse/issues/33323). [#33335](https://github.com/ClickHouse/ClickHouse/pull/33335) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* `LineAsString` can be used as output format. This closes [#30919](https://github.com/ClickHouse/ClickHouse/issues/30919). [#33331](https://github.com/ClickHouse/ClickHouse/pull/33331) ([Sergei Trifonov](https://github.com/serxa)).
* Support `<secure/>` in cluster configuration, as an alternative form of `<secure>1</secure>`. Close [#33270](https://github.com/ClickHouse/ClickHouse/issues/33270). [#33330](https://github.com/ClickHouse/ClickHouse/pull/33330) ([SuperDJY](https://github.com/cmsxbc)).
* Pressing Ctrl+C twice will terminate `clickhouse-benchmark` immediately without waiting for in-flight queries. This closes [#32586](https://github.com/ClickHouse/ClickHouse/issues/32586). [#33303](https://github.com/ClickHouse/ClickHouse/pull/33303) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Support Unix timestamp with milliseconds in `parseDateTimeBestEffort` function. [#33276](https://github.com/ClickHouse/ClickHouse/pull/33276) ([Ben](https://github.com/benbiti)).
* Allow to cancel query while reading data from external table in the formats: `Arrow` / `Parquet` / `ORC` - it failed to be cancelled it case of big files and setting input_format_allow_seeks as false. Closes [#29678](https://github.com/ClickHouse/ClickHouse/issues/29678). [#33238](https://github.com/ClickHouse/ClickHouse/pull/33238) ([Kseniia Sumarokova](https://github.com/kssenii)).
* If table engine supports `SETTINGS` clause, allow to pass the settings as key-value or via config. Add this support for MySQL. [#33231](https://github.com/ClickHouse/ClickHouse/pull/33231) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Correctly prevent Nullable primary keys if necessary. This is for [#32780](https://github.com/ClickHouse/ClickHouse/issues/32780). [#33218](https://github.com/ClickHouse/ClickHouse/pull/33218) ([Amos Bird](https://github.com/amosbird)).
* Add retry for `PostgreSQL` connections in case nothing has been fetched yet. Closes [#33199](https://github.com/ClickHouse/ClickHouse/issues/33199). [#33209](https://github.com/ClickHouse/ClickHouse/pull/33209) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Validate config keys for external dictionaries. [#33095](https://github.com/ClickHouse/ClickHouse/issues/33095#issuecomment-1000577517). [#33130](https://github.com/ClickHouse/ClickHouse/pull/33130) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Send profile info inside `clickhouse-local`. Closes [#33093](https://github.com/ClickHouse/ClickHouse/issues/33093). [#33097](https://github.com/ClickHouse/ClickHouse/pull/33097) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Short circuit evaluation: support for function `throwIf`. Closes [#32969](https://github.com/ClickHouse/ClickHouse/issues/32969). [#32973](https://github.com/ClickHouse/ClickHouse/pull/32973) ([Maksim Kita](https://github.com/kitaisreal)).
* (This only happens in unofficial builds). Fixed segfault when inserting data into compressed Decimal, String, FixedString and Array columns. This closes [#32939](https://github.com/ClickHouse/ClickHouse/issues/32939). [#32940](https://github.com/ClickHouse/ClickHouse/pull/32940) ([N. Kolotov](https://github.com/nkolotov)).
* Added support for specifying subquery as SQL user defined function. Example: `CREATE FUNCTION test AS () -> (SELECT 1)`. Closes [#30755](https://github.com/ClickHouse/ClickHouse/issues/30755). [#32758](https://github.com/ClickHouse/ClickHouse/pull/32758) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve gRPC compression support for [#28671](https://github.com/ClickHouse/ClickHouse/issues/28671). [#32747](https://github.com/ClickHouse/ClickHouse/pull/32747) ([Vitaly Baranov](https://github.com/vitlibar)).
* Flush all In-Memory data parts when WAL is not enabled while shutdown server or detaching table. [#32742](https://github.com/ClickHouse/ClickHouse/pull/32742) ([nauta](https://github.com/nautaa)).
* Allow to control connection timeouts for MySQL (previously was supported only for dictionary source). Closes [#16669](https://github.com/ClickHouse/ClickHouse/issues/16669). Previously default connect_timeout was rather small, now it is configurable. [#32734](https://github.com/ClickHouse/ClickHouse/pull/32734) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Support `authSource` option for storage `MongoDB`. Closes [#32594](https://github.com/ClickHouse/ClickHouse/issues/32594). [#32702](https://github.com/ClickHouse/ClickHouse/pull/32702) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Support `Date32` type in `genarateRandom` table function. [#32643](https://github.com/ClickHouse/ClickHouse/pull/32643) ([nauta](https://github.com/nautaa)).
* Add settings `max_concurrent_select_queries` and `max_concurrent_insert_queries` for control concurrent queries by query kind. Close [#3575](https://github.com/ClickHouse/ClickHouse/issues/3575). [#32609](https://github.com/ClickHouse/ClickHouse/pull/32609) ([SuperDJY](https://github.com/cmsxbc)).
* Improve handling nested structures with missing columns while reading data in `Protobuf` format. Follow-up to https://github.com/ClickHouse/ClickHouse/pull/31988. [#32531](https://github.com/ClickHouse/ClickHouse/pull/32531) ([Vitaly Baranov](https://github.com/vitlibar)).
* Allow empty credentials for `MongoDB` engine. Closes [#26267](https://github.com/ClickHouse/ClickHouse/issues/26267). [#32460](https://github.com/ClickHouse/ClickHouse/pull/32460) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Disable some optimizations for window functions that may lead to exceptions. Closes [#31535](https://github.com/ClickHouse/ClickHouse/issues/31535). Closes [#31620](https://github.com/ClickHouse/ClickHouse/issues/31620). [#32453](https://github.com/ClickHouse/ClickHouse/pull/32453) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Allows to connect to MongoDB 5.0. Closes [#31483](https://github.com/ClickHouse/ClickHouse/issues/31483),. [#32416](https://github.com/ClickHouse/ClickHouse/pull/32416) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Enable comparison between `Decimal` and `Float`. Closes [#22626](https://github.com/ClickHouse/ClickHouse/issues/22626). [#31966](https://github.com/ClickHouse/ClickHouse/pull/31966) ([flynn](https://github.com/ucasFL)).
* Added settings `command_read_timeout`, `command_write_timeout` for `StorageExecutable`, `StorageExecutablePool`, `ExecutableDictionary`, `ExecutablePoolDictionary`, `ExecutableUserDefinedFunctions`. Setting `command_read_timeout` controls timeout for reading data from command stdout in milliseconds. Setting `command_write_timeout` timeout for writing data to command stdin in milliseconds. Added settings `command_termination_timeout` for `ExecutableUserDefinedFunction`, `ExecutableDictionary`, `StorageExecutable`. Added setting `execute_direct` for `ExecutableUserDefinedFunction`, by default true. Added setting `execute_direct` for `ExecutableDictionary`, `ExecutablePoolDictionary`, by default false. [#30957](https://github.com/ClickHouse/ClickHouse/pull/30957) ([Maksim Kita](https://github.com/kitaisreal)).
* Bitmap aggregate functions will give correct result for out of range argument instead of wraparound. [#33127](https://github.com/ClickHouse/ClickHouse/pull/33127) ([DR](https://github.com/freedomDR)).
* Fix parsing incorrect queries with `FROM INFILE` statement. [#33521](https://github.com/ClickHouse/ClickHouse/pull/33521) ([Kruglov Pavel](https://github.com/Avogar)).
* Don't allow to write into `S3` if path contains globs. [#33142](https://github.com/ClickHouse/ClickHouse/pull/33142) ([Kruglov Pavel](https://github.com/Avogar)).
* `--echo` option was not used by `clickhouse-client` in batch mode with single query. [#32843](https://github.com/ClickHouse/ClickHouse/pull/32843) ([N. Kolotov](https://github.com/nkolotov)).
* Use `--database` option for clickhouse-local. [#32797](https://github.com/ClickHouse/ClickHouse/pull/32797) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix surprisingly bad code in SQL ordinary function `file`. Now it supports symlinks. [#32640](https://github.com/ClickHouse/ClickHouse/pull/32640) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Updating `modification_time` for data part in `system.parts` after part movement [#32964](https://github.com/ClickHouse/ClickHouse/issues/32964). [#32965](https://github.com/ClickHouse/ClickHouse/pull/32965) ([save-my-heart](https://github.com/save-my-heart)).
* Potential issue, cannot be exploited: integer overflow may happen in array resize. [#33024](https://github.com/ClickHouse/ClickHouse/pull/33024) ([varadarajkumar](https://github.com/varadarajkumar)).


#### Build/Testing/Packaging Improvement

* Add packages, functional tests and Docker builds for AArch64 (ARM) version of ClickHouse. [#32911](https://github.com/ClickHouse/ClickHouse/pull/32911) ([Mikhail f. Shiryaev](https://github.com/Felixoid)). [#32415](https://github.com/ClickHouse/ClickHouse/pull/32415)
* Prepare ClickHouse to be built with musl-libc. It is not enabled by default. [#33134](https://github.com/ClickHouse/ClickHouse/pull/33134) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Make installation script working on FreeBSD. This closes [#33384](https://github.com/ClickHouse/ClickHouse/issues/33384). [#33418](https://github.com/ClickHouse/ClickHouse/pull/33418) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Add `actionlint` for GitHub Actions workflows and verify workflow files via `act --list` to check the correct workflow syntax. [#33612](https://github.com/ClickHouse/ClickHouse/pull/33612) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Add more tests for the nullable primary key feature. Add more tests with different types and merge tree kinds, plus randomly generated data. [#33228](https://github.com/ClickHouse/ClickHouse/pull/33228) ([Amos Bird](https://github.com/amosbird)).
* Add a simple tool to visualize flaky tests in web browser. [#33185](https://github.com/ClickHouse/ClickHouse/pull/33185) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Enable hermetic build for shared builds. This is mainly for developers. [#32968](https://github.com/ClickHouse/ClickHouse/pull/32968) ([Amos Bird](https://github.com/amosbird)).
* Update `libc++` and `libc++abi` to the latest. [#32484](https://github.com/ClickHouse/ClickHouse/pull/32484) ([Raúl Marín](https://github.com/Algunenano)).
* Added integration test for external .NET client ([ClickHouse.Client](https://github.com/DarkWanderer/ClickHouse.Client)). [#23230](https://github.com/ClickHouse/ClickHouse/pull/23230) ([Oleg V. Kozlyuk](https://github.com/DarkWanderer)).
* Inject git information into clickhouse binary file. So we can get source code revision easily from clickhouse binary file. [#33124](https://github.com/ClickHouse/ClickHouse/pull/33124) ([taiyang-li](https://github.com/taiyang-li)).
* Remove obsolete code from ConfigProcessor. Yandex specific code is not used anymore. The code contained one minor defect. This defect was reported by [Mallik Hassan](https://github.com/SadiHassan) in [#33032](https://github.com/ClickHouse/ClickHouse/issues/33032). This closes [#33032](https://github.com/ClickHouse/ClickHouse/issues/33032). [#33026](https://github.com/ClickHouse/ClickHouse/pull/33026) ([alexey-milovidov](https://github.com/alexey-milovidov)).


#### Bug Fix (user-visible misbehavior in official stable or prestable release)

* Several fixes for format parsing. This is relevant if `clickhouse-server` is open for write access to adversary. Specifically crafted input data for `Native` format may lead to reading uninitialized memory or crash. This is relevant if `clickhouse-server` is open for write access to adversary. [#33050](https://github.com/ClickHouse/ClickHouse/pull/33050) ([Heena Bansal](https://github.com/HeenaBansal2009)). Fixed Apache Avro Union type index out of boundary issue in Apache Avro binary format. [#33022](https://github.com/ClickHouse/ClickHouse/pull/33022) ([Harry Lee](https://github.com/HarryLeeIBM)). Fix null pointer dereference in `LowCardinality` data when deserializing `LowCardinality` data in the Native format. [#33021](https://github.com/ClickHouse/ClickHouse/pull/33021) ([Harry Lee](https://github.com/HarryLeeIBM)).
* ClickHouse Keeper handler will correctly remove operation when response sent. [#32988](https://github.com/ClickHouse/ClickHouse/pull/32988) ([JackyWoo](https://github.com/JackyWoo)).
* Potential off-by-one miscalculation of quotas: quota limit was not reached, but the limit was exceeded. This fixes [#31174](https://github.com/ClickHouse/ClickHouse/issues/31174). [#31656](https://github.com/ClickHouse/ClickHouse/pull/31656) ([sunny](https://github.com/sunny19930321)).
* Fixed CASTing from String to IPv4 or IPv6 and back. Fixed error message in case of failed conversion. [#29224](https://github.com/ClickHouse/ClickHouse/pull/29224) ([Dmitry Novik](https://github.com/novikd)) [#27914](https://github.com/ClickHouse/ClickHouse/pull/27914) ([Vasily Nemkov](https://github.com/Enmk)).
* Fixed an exception like `Unknown aggregate function nothing` during an execution on a remote server. This fixes [#16689](https://github.com/ClickHouse/ClickHouse/issues/16689). [#26074](https://github.com/ClickHouse/ClickHouse/pull/26074) ([hexiaoting](https://github.com/hexiaoting)).
* Fix wrong database for JOIN without explicit database in distributed queries (Fixes: [#10471](https://github.com/ClickHouse/ClickHouse/issues/10471)). [#33611](https://github.com/ClickHouse/ClickHouse/pull/33611) ([Azat Khuzhin](https://github.com/azat)).
* Fix segfault in Apache `Avro` format that appears after the second insert into file. [#33566](https://github.com/ClickHouse/ClickHouse/pull/33566) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix segfault in Apache `Arrow` format if schema contains `Dictionary` type. Closes [#33507](https://github.com/ClickHouse/ClickHouse/issues/33507). [#33529](https://github.com/ClickHouse/ClickHouse/pull/33529) ([Kruglov Pavel](https://github.com/Avogar)).
* Out of band `offset` and `limit` settings may be applied incorrectly for views. Close [#33289](https://github.com/ClickHouse/ClickHouse/issues/33289) [#33518](https://github.com/ClickHouse/ClickHouse/pull/33518) ([hexiaoting](https://github.com/hexiaoting)).
* Fix an exception `Block structure mismatch` which may happen during insertion into table with default nested `LowCardinality` column. Fixes [#33028](https://github.com/ClickHouse/ClickHouse/issues/33028). [#33504](https://github.com/ClickHouse/ClickHouse/pull/33504) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix dictionary expressions for `range_hashed` range min and range max attributes when created using DDL. Closes [#30809](https://github.com/ClickHouse/ClickHouse/issues/30809). [#33478](https://github.com/ClickHouse/ClickHouse/pull/33478) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix possible use-after-free for INSERT into Materialized View with concurrent DROP ([Azat Khuzhin](https://github.com/azat)).
* Do not try to read pass EOF (to workaround for a bug in the Linux kernel), this bug can be reproduced on kernels (3.14..5.9), and requires `index_granularity_bytes=0` (i.e. turn off adaptive index granularity). [#33372](https://github.com/ClickHouse/ClickHouse/pull/33372) ([Azat Khuzhin](https://github.com/azat)).
* The commands `SYSTEM SUSPEND` and `SYSTEM ... THREAD FUZZER` missed access control. It is fixed. Author: Kevin Michel. [#33333](https://github.com/ClickHouse/ClickHouse/pull/33333) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix when `COMMENT` for dictionaries does not appear in `system.tables`, `system.dictionaries`. Allow to modify the comment for `Dictionary` engine. Closes [#33251](https://github.com/ClickHouse/ClickHouse/issues/33251). [#33261](https://github.com/ClickHouse/ClickHouse/pull/33261) ([Maksim Kita](https://github.com/kitaisreal)).
* Add asynchronous inserts (with enabled setting `async_insert`) to query log. Previously such queries didn't appear in the query log. [#33239](https://github.com/ClickHouse/ClickHouse/pull/33239) ([Anton Popov](https://github.com/CurtizJ)).
* Fix sending `WHERE 1 = 0` expressions for external databases query. Closes [#33152](https://github.com/ClickHouse/ClickHouse/issues/33152). [#33214](https://github.com/ClickHouse/ClickHouse/pull/33214) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix DDL validation for MaterializedPostgreSQL. Fix setting `materialized_postgresql_allow_automatic_update`. Closes [#29535](https://github.com/ClickHouse/ClickHouse/issues/29535). [#33200](https://github.com/ClickHouse/ClickHouse/pull/33200) ([Kseniia Sumarokova](https://github.com/kssenii)). Make sure unused replication slots are always removed. Found in [#26952](https://github.com/ClickHouse/ClickHouse/issues/26952). [#33187](https://github.com/ClickHouse/ClickHouse/pull/33187) ([Kseniia Sumarokova](https://github.com/kssenii)). Fix MaterializedPostreSQL detach/attach (removing / adding to replication) tables with non-default schema. Found in [#29535](https://github.com/ClickHouse/ClickHouse/issues/29535). [#33179](https://github.com/ClickHouse/ClickHouse/pull/33179) ([Kseniia Sumarokova](https://github.com/kssenii)). Fix DROP MaterializedPostgreSQL database. [#33468](https://github.com/ClickHouse/ClickHouse/pull/33468) ([Kseniia Sumarokova](https://github.com/kssenii)).
* The metric `StorageBufferBytes` sometimes was miscalculated. [#33159](https://github.com/ClickHouse/ClickHouse/pull/33159) ([xuyatian](https://github.com/xuyatian)).
* Fix error `Invalid version for SerializationLowCardinality key column` in case of reading from `LowCardinality` column with `local_filesystem_read_prefetch` or `remote_filesystem_read_prefetch` enabled. [#33046](https://github.com/ClickHouse/ClickHouse/pull/33046) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix `s3` table function reading empty file. Closes [#33008](https://github.com/ClickHouse/ClickHouse/issues/33008). [#33037](https://github.com/ClickHouse/ClickHouse/pull/33037) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix Context leak in case of cancel_http_readonly_queries_on_client_close (i.e. leaking of external tables that had been uploaded the the server and other resources). [#32982](https://github.com/ClickHouse/ClickHouse/pull/32982) ([Azat Khuzhin](https://github.com/azat)).
* Fix wrong tuple output in `CSV` format in case of custom csv delimiter. [#32981](https://github.com/ClickHouse/ClickHouse/pull/32981) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix HDFS URL check that didn't allow using HA namenode address. Bug was introduced in https://github.com/ClickHouse/ClickHouse/pull/31042. [#32976](https://github.com/ClickHouse/ClickHouse/pull/32976) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix throwing exception like positional argument out of bounds for non-positional arguments. Closes [#31173](https://github.com/ClickHouse/ClickHouse/issues/31173)#event-5789668239. [#32961](https://github.com/ClickHouse/ClickHouse/pull/32961) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix UB in case of unexpected EOF during filling a set from HTTP query (i.e. if the client interrupted in the middle, i.e. `timeout 0.15s curl -Ss -F 's=@t.csv;' 'http://127.0.0.1:8123/?s_structure=key+Int&query=SELECT+dummy+IN+s'` and with large enough `t.csv`). [#32955](https://github.com/ClickHouse/ClickHouse/pull/32955) ([Azat Khuzhin](https://github.com/azat)).
* Fix a regression in `replaceRegexpAll` function. The function worked incorrectly when matched substring was empty. This closes [#32777](https://github.com/ClickHouse/ClickHouse/issues/32777). This closes [#30245](https://github.com/ClickHouse/ClickHouse/issues/30245). [#32945](https://github.com/ClickHouse/ClickHouse/pull/32945) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix `ORC` format stripe reading. [#32929](https://github.com/ClickHouse/ClickHouse/pull/32929) ([kreuzerkrieg](https://github.com/kreuzerkrieg)).
* `topKWeightedState` failed for some input types. [#32487](https://github.com/ClickHouse/ClickHouse/issues/32487). [#32914](https://github.com/ClickHouse/ClickHouse/pull/32914) ([vdimir](https://github.com/vdimir)).
* Fix exception `Single chunk is expected from view inner query (LOGICAL_ERROR)` in materialized view. Fixes [#31419](https://github.com/ClickHouse/ClickHouse/issues/31419). [#32862](https://github.com/ClickHouse/ClickHouse/pull/32862) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix optimization with lazy seek for async reads from remote filesystems. Closes [#32803](https://github.com/ClickHouse/ClickHouse/issues/32803). [#32835](https://github.com/ClickHouse/ClickHouse/pull/32835) ([Kseniia Sumarokova](https://github.com/kssenii)).
* `MergeTree` table engine might silently skip some mutations if there are too many running mutations or in case of high memory consumption, it's fixed. Fixes [#17882](https://github.com/ClickHouse/ClickHouse/issues/17882). [#32814](https://github.com/ClickHouse/ClickHouse/pull/32814) ([tavplubix](https://github.com/tavplubix)).
* Avoid reusing the scalar subquery cache when processing MV blocks. This fixes a bug when the scalar query reference the source table but it means that all subscalar queries in the MV definition will be calculated for each block. [#32811](https://github.com/ClickHouse/ClickHouse/pull/32811) ([Raúl Marín](https://github.com/Algunenano)).
* Server might fail to start if database with `MySQL` engine cannot connect to MySQL server, it's fixed. Fixes [#14441](https://github.com/ClickHouse/ClickHouse/issues/14441). [#32802](https://github.com/ClickHouse/ClickHouse/pull/32802) ([tavplubix](https://github.com/tavplubix)).
* Fix crash when used `fuzzBits` function, close [#32737](https://github.com/ClickHouse/ClickHouse/issues/32737). [#32755](https://github.com/ClickHouse/ClickHouse/pull/32755) ([SuperDJY](https://github.com/cmsxbc)).
* Fix error `Column is not under aggregate function` in case of MV with `GROUP BY (list of columns)` (which is pared as `GROUP BY tuple(...)`) over `Kafka`/`RabbitMQ`. Fixes [#32668](https://github.com/ClickHouse/ClickHouse/issues/32668) and [#32744](https://github.com/ClickHouse/ClickHouse/issues/32744). [#32751](https://github.com/ClickHouse/ClickHouse/pull/32751) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix `ALTER TABLE ... MATERIALIZE TTL` query with `TTL ... DELETE WHERE ...` and `TTL ... GROUP BY ...` modes. [#32695](https://github.com/ClickHouse/ClickHouse/pull/32695) ([Anton Popov](https://github.com/CurtizJ)).
* Fix `optimize_read_in_order` optimization in case when table engine is `Distributed` or `Merge` and its underlying `MergeTree` tables have monotonous function in prefix of sorting key. [#32670](https://github.com/ClickHouse/ClickHouse/pull/32670) ([Anton Popov](https://github.com/CurtizJ)).
* Fix LOGICAL_ERROR exception when the target of a materialized view is a JOIN or a SET table. [#32669](https://github.com/ClickHouse/ClickHouse/pull/32669) ([Raúl Marín](https://github.com/Algunenano)).
* Inserting into S3 with multipart upload to Google Cloud Storage may trigger abort. [#32504](https://github.com/ClickHouse/ClickHouse/issues/32504). [#32649](https://github.com/ClickHouse/ClickHouse/pull/32649) ([vdimir](https://github.com/vdimir)).
* Fix possible exception at `RabbitMQ` storage startup by delaying channel creation. [#32584](https://github.com/ClickHouse/ClickHouse/pull/32584) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix table lifetime (i.e. possible use-after-free) in case of parallel DROP TABLE and INSERT. [#32572](https://github.com/ClickHouse/ClickHouse/pull/32572) ([Azat Khuzhin](https://github.com/azat)).
* Fix async inserts with formats `CustomSeparated`, `Template`, `Regexp`, `MsgPack` and `JSONAsString`. Previousely the async inserts with these formats didn't read any data. [#32530](https://github.com/ClickHouse/ClickHouse/pull/32530) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix `groupBitmapAnd` function on distributed table. [#32529](https://github.com/ClickHouse/ClickHouse/pull/32529) ([minhthucdao](https://github.com/dmthuc)).
* Fix crash in JOIN found by fuzzer, close [#32458](https://github.com/ClickHouse/ClickHouse/issues/32458). [#32508](https://github.com/ClickHouse/ClickHouse/pull/32508) ([vdimir](https://github.com/vdimir)).
* Proper handling of the case with Apache Arrow column duplication. [#32507](https://github.com/ClickHouse/ClickHouse/pull/32507) ([Dmitriy Mokhnatkin](https://github.com/DMokhnatkin)).
* Fix issue with ambiguous query formatting in distributed queries that led to errors when some table columns were named `ALL` or `DISTINCT`. This closes [#32391](https://github.com/ClickHouse/ClickHouse/issues/32391). [#32490](https://github.com/ClickHouse/ClickHouse/pull/32490) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix failures in queries that are trying to use skipping indices, which are not materialized yet. Fixes [#32292](https://github.com/ClickHouse/ClickHouse/issues/32292) and [#30343](https://github.com/ClickHouse/ClickHouse/issues/30343). [#32359](https://github.com/ClickHouse/ClickHouse/pull/32359) ([Anton Popov](https://github.com/CurtizJ)).
* Fix broken select query when there are more than 2 row policies on same column, begin at second queries on the same session. [#31606](https://github.com/ClickHouse/ClickHouse/issues/31606). [#32291](https://github.com/ClickHouse/ClickHouse/pull/32291) ([SuperDJY](https://github.com/cmsxbc)).
* Fix fractional unix timestamp conversion to `DateTime64`, fractional part was reversed for negative unix timestamps (before 1970-01-01). [#32240](https://github.com/ClickHouse/ClickHouse/pull/32240) ([Ben](https://github.com/benbiti)).
* Some entries of replication queue might hang for `temporary_directories_lifetime` (1 day by default) with `Directory tmp_merge_<part_name>` or `Part ... (state Deleting) already exists, but it will be deleted soon` or similar error. It's fixed. Fixes [#29616](https://github.com/ClickHouse/ClickHouse/issues/29616). [#32201](https://github.com/ClickHouse/ClickHouse/pull/32201) ([tavplubix](https://github.com/tavplubix)).
* Fix parsing of `APPLY lambda` column transformer which could lead to client/server crash. [#32138](https://github.com/ClickHouse/ClickHouse/pull/32138) ([Kruglov Pavel](https://github.com/Avogar)).
* Fix `base64Encode` adding trailing bytes on small strings. [#31797](https://github.com/ClickHouse/ClickHouse/pull/31797) ([Kevin Michel](https://github.com/kmichel-aiven)).
* Fix possible crash (or incorrect result) in case of `LowCardinality` arguments of window function. Fixes [#31114](https://github.com/ClickHouse/ClickHouse/issues/31114). [#31888](https://github.com/ClickHouse/ClickHouse/pull/31888) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix hang up with command `DROP TABLE system.query_log sync`. [#33293](https://github.com/ClickHouse/ClickHouse/pull/33293) ([zhanghuajie](https://github.com/zhanghuajieHIT)).


## [Changelog for 2021](https://clickhouse.com/docs/en/whats-new/changelog/2021)