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ClickHouse/CHANGELOG.md
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### 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://github.com/ClickHouse/ClickHouse/blob/master/docs/en/whats-new/changelog/2021.md)
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