### ClickHouse release v21.11.1.8636-prestable FIXME as compared to v21.10.1.8013-prestable
#### Backward Incompatible Change
* Now ClickHouse Keeper snapshots compressed with `ZSTD` codec by default instead of custom ClickHouse LZ4 block compression. This behavior can be turned off with `compress_snapshots_with_zstd_format` coordination setting (must be equal on all quorum replicas). Backward incompatibility is quite rare and may happen only when new node will send snapshot (happens in case of recovery) to the old node which is unable to read snapshots in ZSTD format. [#29417](https://github.com/ClickHouse/ClickHouse/pull/29417) ([alesapin](https://github.com/alesapin)).
* Function `bayesAB` is removed. This closes [#26233](https://github.com/ClickHouse/ClickHouse/issues/26233). [#29934](https://github.com/ClickHouse/ClickHouse/pull/29934) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Remove MergeTree table setting `write_final_mark`. It will be always `true`. [#30455](https://github.com/ClickHouse/ClickHouse/pull/30455) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Change order of json_path and json in sql json function (to be correct). Closes [#30449](https://github.com/ClickHouse/ClickHouse/issues/30449). [#30474](https://github.com/ClickHouse/ClickHouse/pull/30474) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Remove setting odbc_max_field_size because it is not used anymore. Closes [#30413](https://github.com/ClickHouse/ClickHouse/issues/30413). [#30778](https://github.com/ClickHouse/ClickHouse/pull/30778) ([Kseniia Sumarokova](https://github.com/kssenii)).
* clickhouse-format support option `--query`. [#29325](https://github.com/ClickHouse/ClickHouse/pull/29325) ([凌涛](https://github.com/lingtaolf)).
* Users now can set comments to database in `CREATE DATABASE` statement ... [#29429](https://github.com/ClickHouse/ClickHouse/pull/29429) ([Vasily Nemkov](https://github.com/Enmk)).
* New function` mapContainsKeyLike` to get the map that key matches a simple regular expression. [#29471](https://github.com/ClickHouse/ClickHouse/pull/29471) ([凌涛](https://github.com/lingtaolf)).
* ClickHouse HTTP Server can enable HSTS by set `hsts_max_age` in config.xml with a positive number. [#29516](https://github.com/ClickHouse/ClickHouse/pull/29516) ([凌涛](https://github.com/lingtaolf)).
* - Added MD4 and SHA384 functions. [#29602](https://github.com/ClickHouse/ClickHouse/pull/29602) ([Nikita Tikhomirov](https://github.com/NSTikhomirov)).
* Support EXISTS(subquery). Closes [#6852](https://github.com/ClickHouse/ClickHouse/issues/6852). [#29731](https://github.com/ClickHouse/ClickHouse/pull/29731) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Added function `ngram`. Closes [#29699](https://github.com/ClickHouse/ClickHouse/issues/29699). [#29738](https://github.com/ClickHouse/ClickHouse/pull/29738) ([Maksim Kita](https://github.com/kitaisreal)).
* Returns String with OS Kernel version. [#29755](https://github.com/ClickHouse/ClickHouse/pull/29755) ([Memo](https://github.com/Joeywzr)).
* Predefined configuration for table function remote. Closes [#29756](https://github.com/ClickHouse/ClickHouse/issues/29756). [#29774](https://github.com/ClickHouse/ClickHouse/pull/29774) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Add `table` alias to system.tables and `database` alias to system.databases [#29677](https://github.com/ClickHouse/ClickHouse/issues/29677). [#29882](https://github.com/ClickHouse/ClickHouse/pull/29882) ([kevin wan](https://github.com/MaxWk)).
* Added columns `data_compressed_bytes`, `data_uncompressed_bytes`, `marks_bytes` into `system.data_skipping_indices`. Added columns `secondary_indices_compressed_bytes`, `secondary_indices_uncompressed_bytes`, `secondary_indices_marks_bytes` into `system.parts`. Closes [#29697](https://github.com/ClickHouse/ClickHouse/issues/29697). [#29896](https://github.com/ClickHouse/ClickHouse/pull/29896) ([Maksim Kita](https://github.com/kitaisreal)).
* User can now create dictionaries with comments: `CREATE DICTIONARY ... COMMENT 'vaue'` ... [#29899](https://github.com/ClickHouse/ClickHouse/pull/29899) ([Vasily Nemkov](https://github.com/Enmk)).
* Add support for FreeBSD aarch64. [#29952](https://github.com/ClickHouse/ClickHouse/pull/29952) ([MikaelUrankar](https://github.com/MikaelUrankar)).
* Added function `tokens`. That allow to split string into tokens using non-alpha numeric ASCII characters as separators. [#29981](https://github.com/ClickHouse/ClickHouse/pull/29981) ([Maksim Kita](https://github.com/kitaisreal)).
* Added new JSONExtractKeys function ... [#30056](https://github.com/ClickHouse/ClickHouse/pull/30056) ([Vitaly Orlov](https://github.com/orloffv)).
* Add ability to change nodes configuration (in `.xml` file) for ClickHouse Keeper. [#30372](https://github.com/ClickHouse/ClickHouse/pull/30372) ([alesapin](https://github.com/alesapin)).
* CompiledExpressionCache limit elements size using `compiled_expression_cache_elements_size` setting. [#30667](https://github.com/ClickHouse/ClickHouse/pull/30667) ([Maksim Kita](https://github.com/kitaisreal)).
* New function `mapExtractKeyLike` to get the map only kept elements matched specified pattern. [#30793](https://github.com/ClickHouse/ClickHouse/pull/30793) ([凌涛](https://github.com/lingtaolf)).
* Support `ALTER TABLE` for tables in `Memory` databases. [#30866](https://github.com/ClickHouse/ClickHouse/pull/30866) ([Alexander Tokmakov](https://github.com/tavplubix)).
#### Performance Improvement
* * Remove branchy code in filter operation with a better implementation with popcnt/ctz which have better performance. [#29881](https://github.com/ClickHouse/ClickHouse/pull/29881) ([Jun Jin](https://github.com/vesslanjin)).
* - To take advantage of X86_64 feature, Use AVX2/AVX512 instructions to accelerate filter operation. [#30014](https://github.com/ClickHouse/ClickHouse/pull/30014) ([jasperzhu](https://github.com/jinjunzh)).
* Improve performance of aggregation in order of primary key (with enabled setting `optimize_aggregation_in_order`). [#30266](https://github.com/ClickHouse/ClickHouse/pull/30266) ([Anton Popov](https://github.com/CurtizJ)).
* ColumnDecimal improve performance for filter operation. [#30431](https://github.com/ClickHouse/ClickHouse/pull/30431) ([Jun Jin](https://github.com/vesslanjin)).
* Dictionaries support read from multiple threads. [#30500](https://github.com/ClickHouse/ClickHouse/pull/30500) ([Maksim Kita](https://github.com/kitaisreal)).
* - Improve filter bitmask generator function all in one with sse/avx2/avx512 instructions. [#30670](https://github.com/ClickHouse/ClickHouse/pull/30670) ([jasperzhu](https://github.com/jinjunzh)).
* Queries with `INTO OUTFILE` in `clickhouse-client` will use multiple threads. Fix the issue with flickering progress-bar when using `INTO OUTFILE`. This closes [#30873](https://github.com/ClickHouse/ClickHouse/issues/30873). This closes [#30872](https://github.com/ClickHouse/ClickHouse/issues/30872). [#30886](https://github.com/ClickHouse/ClickHouse/pull/30886) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
#### Improvement
* Allow to write number in query as binary literal. Example `SELECT 0b001;`. [#29304](https://github.com/ClickHouse/ClickHouse/pull/29304) ([Maksim Kita](https://github.com/kitaisreal)).
* Pass through initial query_id for clickhouse-benchmark (previously if you run remote query via `clickhouse-benchmark`, queries on shards will not be linked to the initial query via `initial_query_id`). [#29364](https://github.com/ClickHouse/ClickHouse/pull/29364) ([Azat Khuzhin](https://github.com/azat)).
* fix lost in memory part when freeze. [#29376](https://github.com/ClickHouse/ClickHouse/pull/29376) ([Mo Xuan](https://github.com/mo-avatar)).
* Apply config changes to `max_concurrent_queries` during runtime (no need to restart). [#29414](https://github.com/ClickHouse/ClickHouse/pull/29414) ([Raúl Marín](https://github.com/Algunenano)).
* Transform `isNull`/`isNotNull` to `IS NULL`/`IS NOT NULL` (for external dbs, i.e. MySQL). [#29446](https://github.com/ClickHouse/ClickHouse/pull/29446) ([Azat Khuzhin](https://github.com/azat)).
* Add support for `IS NULL`/`IS NOT NULL` for external dbs (i.e. MySQL). [#29463](https://github.com/ClickHouse/ClickHouse/pull/29463) ([Azat Khuzhin](https://github.com/azat)).
* Fixed `There is no query or query context has expired` error in mutations with nested subqueries. Do not allow subqueries in mutation if table is replicated and `allow_nondeterministic_mutations` setting is disabled. [#29495](https://github.com/ClickHouse/ClickHouse/pull/29495) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Get rid of pointless restriction on projection name. Now projection name can start with `tmp_`. [#29520](https://github.com/ClickHouse/ClickHouse/pull/29520) ([Amos Bird](https://github.com/amosbird)).
* Reload dictionaries, models, user defined executable functions if servers config `dictionaries_config`, `models_config`, `user_defined_executable_functions_config` changes. Closes [#28142](https://github.com/ClickHouse/ClickHouse/issues/28142). [#29529](https://github.com/ClickHouse/ClickHouse/pull/29529) ([Maksim Kita](https://github.com/kitaisreal)).
* Allow user to change log levels without restart. [#29586](https://github.com/ClickHouse/ClickHouse/pull/29586) ([Nikolay Degterinsky](https://github.com/evillique)).
* Increase `listen_backlog` by default (to match default in newer linux kernel). [#29643](https://github.com/ClickHouse/ClickHouse/pull/29643) ([Azat Khuzhin](https://github.com/azat)).
* Fix incorrect nullable processing of JSONFunctions. This fixes [#29615](https://github.com/ClickHouse/ClickHouse/issues/29615) . Mark as improvement because https://github.com/ClickHouse/ClickHouse/pull/28012 is not released. [#29659](https://github.com/ClickHouse/ClickHouse/pull/29659) ([Amos Bird](https://github.com/amosbird)).
* Fixed the issue: `clickhouse-format --obfuscate` cannot process queries with embedded dictionaries (functions `regionTo...`). [#29667](https://github.com/ClickHouse/ClickHouse/pull/29667) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Query obfuscator `clickhouse-format --obfuscate` now works with more types of queries. [#29672](https://github.com/ClickHouse/ClickHouse/pull/29672) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Make `url` table function to process multiple URLs in parallel. This closes [#29670](https://github.com/ClickHouse/ClickHouse/issues/29670) and closes [#29671](https://github.com/ClickHouse/ClickHouse/issues/29671). [#29673](https://github.com/ClickHouse/ClickHouse/pull/29673) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Add ClickHouse logo to Play UI. [#29674](https://github.com/ClickHouse/ClickHouse/pull/29674) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Apply `max_untracked_memory`/`memory_profiler_step`/`memory_profiler_sample_probability` during mutate/merge. [#29681](https://github.com/ClickHouse/ClickHouse/pull/29681) ([Azat Khuzhin](https://github.com/azat)).
* Remove some redundant `seek` calls while reading compressed blocks in MergeTree table engines family. [#29766](https://github.com/ClickHouse/ClickHouse/pull/29766) ([alesapin](https://github.com/alesapin)).
* Web UI: render bars in table cells. [#29792](https://github.com/ClickHouse/ClickHouse/pull/29792) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Added partitioned table prefix 'p' for the query for fetching replica identity index. [#29828](https://github.com/ClickHouse/ClickHouse/pull/29828) ([Shoh Jahon](https://github.com/Shohjahon)).
* Add ability to trace peak memory usage (with new trace_type - MemoryPeak). [#29858](https://github.com/ClickHouse/ClickHouse/pull/29858) ([Azat Khuzhin](https://github.com/azat)).
* Remove unused variable in s3cluster. [#29912](https://github.com/ClickHouse/ClickHouse/pull/29912) ([李扬](https://github.com/taiyang-li)).
* Add `shutdown_wait_unfinished_queries` server setting to allowing waiting for running queries up to `shutdown_wait_unfinished` time. This is for [#24451](https://github.com/ClickHouse/ClickHouse/issues/24451) . [#29914](https://github.com/ClickHouse/ClickHouse/pull/29914) ([Amos Bird](https://github.com/amosbird)).
* Now min-max aggregation over the first expression of primary key is optimized by projection. This is for https://github.com/ClickHouse/ClickHouse/issues/329. [#29918](https://github.com/ClickHouse/ClickHouse/pull/29918) ([Amos Bird](https://github.com/amosbird)).
* Add ability to configure retries and delays between them for `clickhouse-copier`. [#29921](https://github.com/ClickHouse/ClickHouse/pull/29921) ([Azat Khuzhin](https://github.com/azat)).
* Update zoneinfo files to 2021c. [#29925](https://github.com/ClickHouse/ClickHouse/pull/29925) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Better exception message while reading column from Arrow-supported formats like `Arrow`, `ArrowStream`, `Parquet` and `ORC`. This closes [#29926](https://github.com/ClickHouse/ClickHouse/issues/29926). [#29927](https://github.com/ClickHouse/ClickHouse/pull/29927) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix lock-order-inversion between periodic dictionary reload and config reload. [#29928](https://github.com/ClickHouse/ClickHouse/pull/29928) ([Azat Khuzhin](https://github.com/azat)).
* Fix `lock-order-inversion` between `DROP TABLE` for `DatabaseMemory` and `LiveView`. [#29929](https://github.com/ClickHouse/ClickHouse/pull/29929) ([Azat Khuzhin](https://github.com/azat)).
* Fix data-race between flush() and startup() in StorageBuffer. [#29930](https://github.com/ClickHouse/ClickHouse/pull/29930) ([Azat Khuzhin](https://github.com/azat)).
* Now clickhouse use DNS cache while communicating with external S3. [#29999](https://github.com/ClickHouse/ClickHouse/pull/29999) ([alesapin](https://github.com/alesapin)).
* ProfileEvents::Counters snapshot doesn't store data in std::atomic anymore. [#30000](https://github.com/ClickHouse/ClickHouse/pull/30000) ([Dmitry Novik](https://github.com/novikd)).
* Add ability to print raw profile events to `clickhouse-client` (This can be useful for debugging and for testing). [#30064](https://github.com/ClickHouse/ClickHouse/pull/30064) ([Azat Khuzhin](https://github.com/azat)).
* Improve solution https://github.com/ClickHouse/ClickHouse/pull/28853 See also https://github.com/ClickHouse/ClickHouse/pull/29928. [#30084](https://github.com/ClickHouse/ClickHouse/pull/30084) ([Vitaly Baranov](https://github.com/vitlibar)).
* Reduce amount of redundant compressed data read from disk for some types `SELECT` queries (only for MergeTree engines family). [#30111](https://github.com/ClickHouse/ClickHouse/pull/30111) ([alesapin](https://github.com/alesapin)).
* PolygonDictionary added support for read method if setting `store_polygon_key_column` = true. Closes [#30090](https://github.com/ClickHouse/ClickHouse/issues/30090). [#30142](https://github.com/ClickHouse/ClickHouse/pull/30142) ([Maksim Kita](https://github.com/kitaisreal)).
* Now clickhouse-client supports native multi-line editing. [#30143](https://github.com/ClickHouse/ClickHouse/pull/30143) ([Amos Bird](https://github.com/amosbird)).
* Now `Keeper` (as part of `clickhouse-server`) will start asynchronously if it can connect to some other node. [#30170](https://github.com/ClickHouse/ClickHouse/pull/30170) ([alesapin](https://github.com/alesapin)).
* Support SQL user defined functions for clickhouse-local. [#30179](https://github.com/ClickHouse/ClickHouse/pull/30179) ([Maksim Kita](https://github.com/kitaisreal)).
* Allow to remove `SAMPLE BY` expression from `MergeTree` tables (`ALTER TABLE <table> REMOVE SAMPLE BY`). [#30180](https://github.com/ClickHouse/ClickHouse/pull/30180) ([Anton Popov](https://github.com/CurtizJ)).
* Fixed comparison of Date32 with Date, DateTime, DateTime64, String. [#30219](https://github.com/ClickHouse/ClickHouse/pull/30219) ([liang.huang](https://github.com/lhuang09287750)).
* Allow symlinks to files in user_files directory for file table function. [#30309](https://github.com/ClickHouse/ClickHouse/pull/30309) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Minor improvements in replica cloning and enqueuing fetch for broken parts, that should avoid extremely rare hanging of `GET_PART` entries in replication queue. [#30346](https://github.com/ClickHouse/ClickHouse/pull/30346) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Added an ability to use FINAL clause in SELECT queries from GraphiteMergeTree. [#30360](https://github.com/ClickHouse/ClickHouse/pull/30360) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Allow extract non-string element as string using JSONExtractString. This is for https://github.com/ClickHouse/ClickHouse/pull/25452#issuecomment-927123287. [#30426](https://github.com/ClickHouse/ClickHouse/pull/30426) ([Amos Bird](https://github.com/amosbird)).
* More full support of positional arguments. [#30433](https://github.com/ClickHouse/ClickHouse/pull/30433) ([Kseniia Sumarokova](https://github.com/kssenii)).
* SQLUserDefinedFunctions support lambdas. Example `CREATE FUNCTION lambda_function AS x -> arrayMap(element -> element * 2, x);`. [#30435](https://github.com/ClickHouse/ClickHouse/pull/30435) ([Maksim Kita](https://github.com/kitaisreal)).
* SQLUserDefinedFunctions added DROP IF EXISTS support. Example `DROP FUNCTION IF EXISTS test_function`. [#30437](https://github.com/ClickHouse/ClickHouse/pull/30437) ([Maksim Kita](https://github.com/kitaisreal)).
* SQLUserDefinedFunctions support `CREATE OR REPLACE`, `CREATE IF NOT EXISTS` syntaxes. [#30454](https://github.com/ClickHouse/ClickHouse/pull/30454) ([Maksim Kita](https://github.com/kitaisreal)).
* Make query, which fetched table structure for PostgreSQL database because, more reliable. [#30477](https://github.com/ClickHouse/ClickHouse/pull/30477) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Get memory amount with Docker/cgroups limitations. See [#25662](https://github.com/ClickHouse/ClickHouse/issues/25662). [#30574](https://github.com/ClickHouse/ClickHouse/pull/30574) ([Pavel Medvedev](https://github.com/pmed)).
* SQLUserDefinedFunctions support ON CLUSTER. Example `CREATE FUNCTION test_function ON CLUSTER 'cluster' AS x -> x + 1;`. Closes [#30666](https://github.com/ClickHouse/ClickHouse/issues/30666). [#30734](https://github.com/ClickHouse/ClickHouse/pull/30734) ([Maksim Kita](https://github.com/kitaisreal)).
* Arrays of all serializable types are now supported by arrayStringConcat. [#30840](https://github.com/ClickHouse/ClickHouse/pull/30840) ([Nikita Taranov](https://github.com/nickitat)).
* Allow to parse values of `Date` data type in text formats as `YYYYMMDD` in addition to `YYYY-MM-DD`. This closes [#30870](https://github.com/ClickHouse/ClickHouse/issues/30870). [#30871](https://github.com/ClickHouse/ClickHouse/pull/30871) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Rename the columns of SessionLog: `session_id` -> `auth_id`, `session_name` -> `session_id`, `changed_settings` -> `settings`. [#30882](https://github.com/ClickHouse/ClickHouse/pull/30882) ([Vitaly Baranov](https://github.com/vitlibar)).
#### Bug Fix
* Fix shutdown of `AccessControlManager`. Now there can't be reloading of the configuration after AccessControlManager has been destroyed. This PR fixes the flaky test [test_user_directories/test.py::test_relative_path](https://clickhouse-test-reports.s3.yandex.net/0/f0e3122507ed8bea3f177495531c7d56bcb32466/integration_tests_(thread).html). [#29951](https://github.com/ClickHouse/ClickHouse/pull/29951) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix releasing query ID and session ID at the end of query processing while handing gRPC call. This PR fixes flaky test [test_grpc_protocol/test.py::test_session](https://clickhouse-test-reports.s3.yandex.net/0/1ac03811a2df9717fa7c633d1af03def821d24b6/integration_tests_(memory).html). [#29954](https://github.com/ClickHouse/ClickHouse/pull/29954) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix reading from empty file on encrypted disk. [#30494](https://github.com/ClickHouse/ClickHouse/pull/30494) ([Vitaly Baranov](https://github.com/vitlibar)).
* Add ability to compile using newer version fo glibc w/o using new symbols. [#29594](https://github.com/ClickHouse/ClickHouse/pull/29594) ([Azat Khuzhin](https://github.com/azat)).
* Turning on experimental constexpr expressions evaluator for clang to speed up template code compilation. [#29668](https://github.com/ClickHouse/ClickHouse/pull/29668) ([Mike Kot](https://github.com/myrrc)).
* Fix an build error because of [Rename "common" to "base"](https://github.com/ClickHouse/ClickHouse/commit/fe6b7c77c7d6bd2a45a20f3b6bb4eb91da6177ff). [#29688](https://github.com/ClickHouse/ClickHouse/pull/29688) ([Sergei Semin](https://github.com/syominsergey)).
* Leave only required files in cross-compile toolchains. Include them as submodules (earlier they were downloaded as tarballs). [#29974](https://github.com/ClickHouse/ClickHouse/pull/29974) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Add cross-build for PowerPC (powerpc64le). This closes [#9589](https://github.com/ClickHouse/ClickHouse/issues/9589). Enable support for interaction with MySQL for AArch64 and PowerPC. This closes [#26301](https://github.com/ClickHouse/ClickHouse/issues/26301). [#30010](https://github.com/ClickHouse/ClickHouse/pull/30010) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Enable Protobuf, Arrow, ORC, Parquet for AArch64 and Darwin builds. This closes [#29248](https://github.com/ClickHouse/ClickHouse/issues/29248). This closes [#28018](https://github.com/ClickHouse/ClickHouse/issues/28018). [#30015](https://github.com/ClickHouse/ClickHouse/pull/30015) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Add tests for encrypted disk & encryption codec and ReplicatedMergeTree. [#30172](https://github.com/ClickHouse/ClickHouse/pull/30172) ([Vitaly Baranov](https://github.com/vitlibar)).
* ClickHouse can be statically built with Musl. This is added as experiment, it does not support building `odbc-bridge`, `library-bridge`, integration with CatBoost and some libraries. [#30248](https://github.com/ClickHouse/ClickHouse/pull/30248) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Recursive submodules are no longer needed for ClickHouse. [#30315](https://github.com/ClickHouse/ClickHouse/pull/30315) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Added docker image to build docs. [#30499](https://github.com/ClickHouse/ClickHouse/pull/30499) ([Ilya Yatsishin](https://github.com/qoega)).
#### Bug Fix (user-visible misbehaviour in official stable or prestable release
* Fix `ORDER BY ... WITH FILL` with set `TO` and `FROM` and no rows in result set. [#30888](https://github.com/ClickHouse/ClickHouse/pull/30888) ([Anton Popov](https://github.com/CurtizJ)).
#### Bug Fix (user-visible misbehaviour in official stable or prestable release)
* Fix hanging DDL queries on Replicated database while adding a new replica. [#29328](https://github.com/ClickHouse/ClickHouse/pull/29328) ([Kevin Michel](https://github.com/kmichel-aiven)).
* Fix vertical merges of projection parts. This fixes [#29253](https://github.com/ClickHouse/ClickHouse/issues/29253) . This PR also fixes several projection merge/mutation issues introduced in https://github.com/ClickHouse/ClickHouse/pull/25165. [#29337](https://github.com/ClickHouse/ClickHouse/pull/29337) ([Amos Bird](https://github.com/amosbird)).
* Remove window function `nth_value` as it is not memory-safe. This closes [#29347](https://github.com/ClickHouse/ClickHouse/issues/29347). [#29348](https://github.com/ClickHouse/ClickHouse/pull/29348) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix replicated access storage not shutting down cleanly when misconfigured. [#29388](https://github.com/ClickHouse/ClickHouse/pull/29388) ([Kevin Michel](https://github.com/kmichel-aiven)).
* rocksdb: fix race condition during multiple DB opening (and get back some tests that triggers the problem on CI). [#29393](https://github.com/ClickHouse/ClickHouse/pull/29393) ([Azat Khuzhin](https://github.com/azat)).
* Fix possible `Block structure mismatch` for subqueries with pushed-down `HAVING` predicate. Fixes [#29010](https://github.com/ClickHouse/ClickHouse/issues/29010). [#29475](https://github.com/ClickHouse/ClickHouse/pull/29475) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed incorrect table name parsing on loading of `Lazy` database. Fixes [#29456](https://github.com/ClickHouse/ClickHouse/issues/29456). [#29476](https://github.com/ClickHouse/ClickHouse/pull/29476) ([Alexander Tokmakov](https://github.com/tavplubix)).
* In ODBC bridge add retries for error Invalid cursor state. It is a retriable error. Closes [#29473](https://github.com/ClickHouse/ClickHouse/issues/29473). [#29518](https://github.com/ClickHouse/ClickHouse/pull/29518) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix bug in check `pathStartsWith` becuase there was bug with the usage of `std::mismatch`: ` The behavior is undefined if the second range is shorter than the first range.`. [#29531](https://github.com/ClickHouse/ClickHouse/pull/29531) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Avoid deadlocks when reading and writting on JOIN Engine tables at the same time. [#29544](https://github.com/ClickHouse/ClickHouse/pull/29544) ([Raúl Marín](https://github.com/Algunenano)).
* Fix null deference for `GROUP BY WITH TOTALS HAVING` (when the column from `HAVING` wasn't selected). [#29553](https://github.com/ClickHouse/ClickHouse/pull/29553) ([Azat Khuzhin](https://github.com/azat)).
* Fix rare segfault in `ALTER MODIFY` query when using incorrect table identifier in `DEFAULT` expression like `x.y.z...` Fixes [#29184](https://github.com/ClickHouse/ClickHouse/issues/29184). [#29573](https://github.com/ClickHouse/ClickHouse/pull/29573) ([alesapin](https://github.com/alesapin)).
* Fix JIT expression compilation with aliases and short-circuit expression evaluation. Closes [#29403](https://github.com/ClickHouse/ClickHouse/issues/29403). [#29574](https://github.com/ClickHouse/ClickHouse/pull/29574) ([Maksim Kita](https://github.com/kitaisreal)).
* Condition in filter predicate could be lost after push-down optimisation. [#29625](https://github.com/ClickHouse/ClickHouse/pull/29625) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed incorrect behaviour of setting `materialized_postgresql_tables_list` at server restart. Found in [#28529](https://github.com/ClickHouse/ClickHouse/issues/28529). [#29686](https://github.com/ClickHouse/ClickHouse/pull/29686) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix incorrect `GROUP BY` (multiple rows with the same keys in result) in case of distributed query when shards had mixed versions `<= 21.3` and `>= 21.4`, `GROUP BY` key had several columns all with fixed size, and two-level aggregation was activated (see `group_by_two_level_threshold` and `group_by_two_level_threshold_bytes`). Fixes [#29580](https://github.com/ClickHouse/ClickHouse/issues/29580). [#29735](https://github.com/ClickHouse/ClickHouse/pull/29735) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix concurrent access to `LowCardinality` during `GROUP BY` (leads to SIGSEGV). [#29782](https://github.com/ClickHouse/ClickHouse/pull/29782) ([Azat Khuzhin](https://github.com/azat)).
* Fix bad cast in `ATTACH TABLE ... FROM 'path'` query when non-string literal is used instead of path. It may lead to reading of uninitialized memory. [#29790](https://github.com/ClickHouse/ClickHouse/pull/29790) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Avoid `Timeout exceeded: elapsed 18446744073.709553 seconds` error that might happen in extremely rare cases, presumably due to some bug in kernel. Fixes [#29154](https://github.com/ClickHouse/ClickHouse/issues/29154). [#29811](https://github.com/ClickHouse/ClickHouse/pull/29811) ([Alexander Tokmakov](https://github.com/tavplubix)).
* MaterializedMySQL: Fix an issue where if the connection to MySQL was lost, only parts of a transaction could be processed. [#29837](https://github.com/ClickHouse/ClickHouse/pull/29837) ([Håvard Kvålen](https://github.com/havardk)).
* Fix system tables recreation check (fails to detect changes in enum values). [#29857](https://github.com/ClickHouse/ClickHouse/pull/29857) ([Azat Khuzhin](https://github.com/azat)).
* Fix potential resource leak of the concurrent query limit of merge tree tables introduced in https://github.com/ClickHouse/ClickHouse/pull/19544 . [#29879](https://github.com/ClickHouse/ClickHouse/pull/29879) ([Amos Bird](https://github.com/amosbird)).
* Fix data-race between `LogSink::writeMarks()` and `LogSource` in `StorageLog`. [#29946](https://github.com/ClickHouse/ClickHouse/pull/29946) ([Azat Khuzhin](https://github.com/azat)).
* Fix possible data-race between `FileChecker` and `StorageLog`/`StorageStripeLog`. [#29959](https://github.com/ClickHouse/ClickHouse/pull/29959) ([Azat Khuzhin](https://github.com/azat)).
* try to close issue: [#29965](https://github.com/ClickHouse/ClickHouse/issues/29965). [#29976](https://github.com/ClickHouse/ClickHouse/pull/29976) ([hexiaoting](https://github.com/hexiaoting)).
* Fix crash of sample by `tuple()`, closes [#30004](https://github.com/ClickHouse/ClickHouse/issues/30004). [#30016](https://github.com/ClickHouse/ClickHouse/pull/30016) ([flynn](https://github.com/ucasfl)).
* Dropped `Memory` database might reappear after server restart, it's fixed ([#29795](https://github.com/ClickHouse/ClickHouse/issues/29795)). Also added `force_remove_data_recursively_on_drop` setting as a workaround for `Directory not empty` error when dropping `Ordinary` database (because it's not possible to remove data leftovers manually in cloud environment). [#30054](https://github.com/ClickHouse/ClickHouse/pull/30054) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Fix race between MOVE PARTITION and merges/mutations for MergeTree. [#30074](https://github.com/ClickHouse/ClickHouse/pull/30074) ([Azat Khuzhin](https://github.com/azat)).
* Fix error `Port is already connected` for queries with `GLOBAL IN` and `WITH TOTALS`. Only for 21.9 and 21.10. [#30086](https://github.com/ClickHouse/ClickHouse/pull/30086) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Support nullable arguments in function `initializeAggregation`. [#30177](https://github.com/ClickHouse/ClickHouse/pull/30177) ([Anton Popov](https://github.com/CurtizJ)).
* Fix INSERT SELECT incorrectly fills MATERIALIZED column based of Nullable column. [#30189](https://github.com/ClickHouse/ClickHouse/pull/30189) ([Azat Khuzhin](https://github.com/azat)).
* Fix `pread_fake_async`/`pread_threadpool` with `min_bytes_to_use_direct_io`. [#30191](https://github.com/ClickHouse/ClickHouse/pull/30191) ([Azat Khuzhin](https://github.com/azat)).
* Fix reading from `MergeTree` with `max_read_buffer_size=0` (can lead to `Can't adjust last granule``LOGICAL_ERROR`, or even data loss). [#30192](https://github.com/ClickHouse/ClickHouse/pull/30192) ([Azat Khuzhin](https://github.com/azat)).
* * Allow identifiers staring with numbers in multiple joins. [#30230](https://github.com/ClickHouse/ClickHouse/pull/30230) ([Vladimir C](https://github.com/vdimir)).
* Fix crash with shortcircuit and lowcardinality in multiIf. [#30243](https://github.com/ClickHouse/ClickHouse/pull/30243) ([Raúl Marín](https://github.com/Algunenano)).
* Fix column alias resolution of JOIN queries when projection is enabled. This fixes [#30146](https://github.com/ClickHouse/ClickHouse/issues/30146). [#30293](https://github.com/ClickHouse/ClickHouse/pull/30293) ([Amos Bird](https://github.com/amosbird)).
* Queries with condition like `IN (subquery)` could return incorrect result in case if aggregate projection applied. Fixed creation of sets for projections. [#30310](https://github.com/ClickHouse/ClickHouse/pull/30310) ([Amos Bird](https://github.com/amosbird)).
* Makes [#30162](https://github.com/ClickHouse/ClickHouse/issues/30162) less possible ... [#30370](https://github.com/ClickHouse/ClickHouse/pull/30370) ([Vasily Nemkov](https://github.com/Enmk)).
* Fixed segfault which might happen if session expired during execution of REPLACE PARTITION. [#30432](https://github.com/ClickHouse/ClickHouse/pull/30432) ([Alexander Tokmakov](https://github.com/tavplubix)).
* * Fix deadlock on ALTER with scalar subquery to the same table, close [#30461](https://github.com/ClickHouse/ClickHouse/issues/30461). [#30492](https://github.com/ClickHouse/ClickHouse/pull/30492) ([Vladimir C](https://github.com/vdimir)).
* Add missing parenthesis for `isNotNull`/`isNull` rewrites to `IS [NOT] NULL` (fixes queries that has something like `isNotNull(1)+isNotNull(2)`). [#30520](https://github.com/ClickHouse/ClickHouse/pull/30520) ([Azat Khuzhin](https://github.com/azat)).
* Limit push down optimization could cause a error `Cannot find column`. Fixes [#30438](https://github.com/ClickHouse/ClickHouse/issues/30438). [#30562](https://github.com/ClickHouse/ClickHouse/pull/30562) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Update aws-sdk submodule for throttling in Yandex.S3. [#30646](https://github.com/ClickHouse/ClickHouse/pull/30646) ([ianton-ru](https://github.com/ianton-ru)).
* Functions for case-insensitive search in UTF8 strings like `positionCaseInsensitiveUTF8` and `countSubstringsCaseInsensitiveUTF8` might find substrings that actually does not match, it's fixed. [#30663](https://github.com/ClickHouse/ClickHouse/pull/30663) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Fix PREWHERE with WHERE in case of always true PREWHERE. [#30668](https://github.com/ClickHouse/ClickHouse/pull/30668) ([Azat Khuzhin](https://github.com/azat)).
* Fixed a race condition between `REPLACE/MOVE PARTITION` and background merge in non-replicated `MergeTree` that might cause a part of moved/replaced data to remain in partition. Fixes [#29327](https://github.com/ClickHouse/ClickHouse/issues/29327). [#30717](https://github.com/ClickHouse/ClickHouse/pull/30717) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Clean temporary directory when localBackup failed by some reason. [#30797](https://github.com/ClickHouse/ClickHouse/pull/30797) ([ianton-ru](https://github.com/ianton-ru)).
* Fixed ambiguity when extracting auxiliary ZooKeeper name from ZooKeeper path in `ReplicatedMergeTree`. Previously server might fail to start with `Unknown auxiliary ZooKeeper name` if ZooKeeper path contains a colon. Fixes [#29052](https://github.com/ClickHouse/ClickHouse/issues/29052). Also it was allowed to specify ZooKeeper path that does not start with slash, but now it's deprecated and creation of new tables with such path is not allowed. Slashes and colons in auxiliary ZooKeeper names are not allowed too. [#30822](https://github.com/ClickHouse/ClickHouse/pull/30822) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Fix crash when projection with hashing function is materialized. This fixes [#30861](https://github.com/ClickHouse/ClickHouse/issues/30861) . The issue is similar to https://github.com/ClickHouse/ClickHouse/pull/28560 which is a lack of proper understanding of the invariant of header's emptyness. [#30877](https://github.com/ClickHouse/ClickHouse/pull/30877) ([Amos Bird](https://github.com/amosbird)).
* Fix set index not used in AND/OR expressions when there are more than two operands. This fixes [#30416](https://github.com/ClickHouse/ClickHouse/issues/30416) . [#30887](https://github.com/ClickHouse/ClickHouse/pull/30887) ([Amos Bird](https://github.com/amosbird)).
#### NO CL ENTRY
* NO CL ENTRY: 'Generate test_results.tsv for fasttest'. [#29319](https://github.com/ClickHouse/ClickHouse/pull/29319) ([Dmitry Novik](https://github.com/novikd)).
* NO CL ENTRY: 'Link FAQ from Debian installation'. [#29836](https://github.com/ClickHouse/ClickHouse/pull/29836) ([Federico Ceratto](https://github.com/FedericoCeratto)).
* NO CL ENTRY: 'add support of window function in antlr grammar'. [#30181](https://github.com/ClickHouse/ClickHouse/pull/30181) ([PHaroZ](https://github.com/PHaroZ)).
* NO CL ENTRY: 'Revert "Fix style regressions on benchmark page"'. [#30652](https://github.com/ClickHouse/ClickHouse/pull/30652) ([alesapin](https://github.com/alesapin)).
* NO CL ENTRY: 'Revert "Improve usability of `remote_url_allow_hosts`"'. [#30707](https://github.com/ClickHouse/ClickHouse/pull/30707) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* NO CL ENTRY: 'Revert "Revert "Improve usability of `remote_url_allow_hosts`""'. [#30708](https://github.com/ClickHouse/ClickHouse/pull/30708) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* NO CL ENTRY: 'remove some unneeded header files'. [#30722](https://github.com/ClickHouse/ClickHouse/pull/30722) ([flynn](https://github.com/ucasfl)).
#### Testing Improvement
* Implemented structure-aware fuzzing approach in ClickHouse for select statement parser. [#30012](https://github.com/ClickHouse/ClickHouse/pull/30012) ([Paul](https://github.com/PaulCher)).
