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#### Backward Incompatible Change #### Backward Incompatible Change
* Change order of json_path and json in SQL/JSON functions (to be consistent with the standard). Closes [#30449](https://github.com/ClickHouse/ClickHouse/issues/30449). [#30474](https://github.com/ClickHouse/ClickHouse/pull/30474) ([Kseniia Sumarokova](https://github.com/kssenii)). * Change order of json_path and json arguments in SQL/JSON functions (to be consistent with the standard). Closes [#30449](https://github.com/ClickHouse/ClickHouse/issues/30449). [#30474](https://github.com/ClickHouse/ClickHouse/pull/30474) ([Kseniia Sumarokova](https://github.com/kssenii)).
* 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)). * 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)). No actions required, all tables are compatible with the new version.
* Function `bayesAB` is removed. Please help to return this function back, refreshed. 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)). * Function `bayesAB` is removed. Please help to return this function back, refreshed. 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)).
* This is relevant only if you already started using the experimental `clickhouse-keeper` support. 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)). * This is relevant only if you already started using the experimental `clickhouse-keeper` support. 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)).
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* Add functions for Unicode normalization: `normalizeUTF8NFC`, `normalizeUTF8NFD`, `normalizeUTF8NFKC`, `normalizeUTF8NFKD` functions. [#28633](https://github.com/ClickHouse/ClickHouse/pull/28633) ([darkkeks](https://github.com/darkkeks)). * Add functions for Unicode normalization: `normalizeUTF8NFC`, `normalizeUTF8NFD`, `normalizeUTF8NFKC`, `normalizeUTF8NFKD` functions. [#28633](https://github.com/ClickHouse/ClickHouse/pull/28633) ([darkkeks](https://github.com/darkkeks)).
* Streaming consumption of application log files in ClickHouse with `FileLog` table engine. It's like `Kafka` or `RabbitMQ` engine but for append-only and rotated logs in local filesystem. Closes [#6953](https://github.com/ClickHouse/ClickHouse/issues/6953). [#25969](https://github.com/ClickHouse/ClickHouse/pull/25969) ([flynn](https://github.com/ucasfl)) ([Kseniia Sumarokova](https://github.com/kssenii)). * Streaming consumption of application log files in ClickHouse with `FileLog` table engine. It's like `Kafka` or `RabbitMQ` engine but for append-only and rotated logs in local filesystem. Closes [#6953](https://github.com/ClickHouse/ClickHouse/issues/6953). [#25969](https://github.com/ClickHouse/ClickHouse/pull/25969) ([flynn](https://github.com/ucasfl)) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Add `CapnProto` output format, refactor `CapnProto` input format. [#29291](https://github.com/ClickHouse/ClickHouse/pull/29291) ([Kruglov Pavel](https://github.com/Avogar)). * Add `CapnProto` output format, refactor `CapnProto` input format. [#29291](https://github.com/ClickHouse/ClickHouse/pull/29291) ([Kruglov Pavel](https://github.com/Avogar)).
* Add `sparkbar` aggregate function. This closes [#26175](https://github.com/ClickHouse/ClickHouse/issues/26175). [#27481](https://github.com/ClickHouse/ClickHouse/pull/27481) ([小路](https://github.com/nicelulu)).
* 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)). * 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)).
* 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)). * Added `hashed_array` dictionary type. It saves memory when using dictionaries with multiple attributes. Closes [#30236](https://github.com/ClickHouse/ClickHouse/issues/30236). [#30242](https://github.com/ClickHouse/ClickHouse/pull/30242) ([Maksim Kita](https://github.com/kitaisreal)).
* Added `JSONExtractKeys` function. [#30056](https://github.com/ClickHouse/ClickHouse/pull/30056) ([Vitaly](https://github.com/orloffv)).
* Added `HashedArray` dictionary type. Closes [#30236](https://github.com/ClickHouse/ClickHouse/issues/30236). [#30242](https://github.com/ClickHouse/ClickHouse/pull/30242) ([Maksim Kita](https://github.com/kitaisreal)). * Add a function `getOSKernelVersion` - it returns a string with OS kernel version. [#29755](https://github.com/ClickHouse/ClickHouse/pull/29755) ([Memo](https://github.com/Joeywzr)).
* Added new JSONExtractKeys function ... [#30056](https://github.com/ClickHouse/ClickHouse/pull/30056) ([Vitaly](https://github.com/orloffv)). * Added `MD4` and `SHA384` functions. MD4 is an obsolete and insecure hash function, it can be used only in rare cases when MD4 is already being used in some legacy system and you need to get exactly the same result. [#29602](https://github.com/ClickHouse/ClickHouse/pull/29602) ([Nikita Tikhomirov](https://github.com/NSTikhomirov)).
* HSTS can be enabled for Clickhouse HTTP server by setting `hsts_max_age` in configuration file with a positive number. [#29516](https://github.com/ClickHouse/ClickHouse/pull/29516) ([凌涛](https://github.com/lingtaolf)).
* 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)).
* 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)).
* 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)).
* 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)).
* Returns String with OS Kernel version. [#29755](https://github.com/ClickHouse/ClickHouse/pull/29755) ([Memo](https://github.com/Joeywzr)).
* Added MD4 and SHA384 functions. [#29602](https://github.com/ClickHouse/ClickHouse/pull/29602) ([Nikita Tikhomirov](https://github.com/NSTikhomirov)).
* 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)).
* Huawei OBS Storage support. Closes [#24294](https://github.com/ClickHouse/ClickHouse/issues/24294). [#29511](https://github.com/ClickHouse/ClickHouse/pull/29511) ([kevin wan](https://github.com/MaxWk)). * Huawei OBS Storage support. Closes [#24294](https://github.com/ClickHouse/ClickHouse/issues/24294). [#29511](https://github.com/ClickHouse/ClickHouse/pull/29511) ([kevin wan](https://github.com/MaxWk)).
* 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)). 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)). * 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)). 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)).
* 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)).
* clickhouse-format support option `--query`. [#29325](https://github.com/ClickHouse/ClickHouse/pull/29325) ([凌涛](https://github.com/lingtaolf)).
* Implemented `ALTER TABLE x MODIFY COMMENT`. [#29264](https://github.com/ClickHouse/ClickHouse/pull/29264) ([Vasily Nemkov](https://github.com/Enmk)). * Implemented `ALTER TABLE x MODIFY COMMENT`. [#29264](https://github.com/ClickHouse/ClickHouse/pull/29264) ([Vasily Nemkov](https://github.com/Enmk)).
* Adds H3 inspection functions that are missing from ClickHouse but are available via the H3 api: https://h3geo.org/docs/api/inspection. [#29209](https://github.com/ClickHouse/ClickHouse/pull/29209) ([Bharat Nallan](https://github.com/bharatnc)). * Adds H3 inspection functions that are missing from ClickHouse but are available via the H3 api: https://h3geo.org/docs/api/inspection. [#29209](https://github.com/ClickHouse/ClickHouse/pull/29209) ([Bharat Nallan](https://github.com/bharatnc)).
* Allow non-replicated ALTER TABLE FETCH and ATTACH in Replicated databases. [#29202](https://github.com/ClickHouse/ClickHouse/pull/29202) ([Kevin Michel](https://github.com/kmichel-aiven)). * Allow non-replicated ALTER TABLE FETCH and ATTACH in Replicated databases. [#29202](https://github.com/ClickHouse/ClickHouse/pull/29202) ([Kevin Michel](https://github.com/kmichel-aiven)).
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#### Performance Improvement #### Performance Improvement
* Background merges can be preempted by each other and they are scheduled with appropriate priorities. Now long running merges won't prevent short merges to proceed. This is needed for a better scheduling and controlling of merges execution. It reduces the chances to get "too many parts" error. [#22381](https://github.com/ClickHouse/ClickHouse/issues/22381). [#25165](https://github.com/ClickHouse/ClickHouse/pull/25165) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)). * Background merges can be preempted by each other and they are scheduled with appropriate priorities. Now long running merges won't prevent short merges to proceed. This is needed for a better scheduling and controlling of merges execution. It reduces the chances to get "too many parts" error. [#22381](https://github.com/ClickHouse/ClickHouse/issues/22381). [#25165](https://github.com/ClickHouse/ClickHouse/pull/25165) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)). Added an ability to execute more merges and mutations than the number of threads in background pool. Merges and mutations will be executed step by step according to their sizes (lower is more prioritized). The ratio of the number of tasks to threads to execute is controlled by a setting `background_merges_mutations_concurrency_ratio`, 2 by default. [#29140](https://github.com/ClickHouse/ClickHouse/pull/29140) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Allow to use asynchronous reads for remote filesystems. Lower the number of seeks while reading from remote filesystems. It improves performance tremendously and makes the experimental `web` and `s3` disks to work faster than EBS under certain conditions. [#29205](https://github.com/ClickHouse/ClickHouse/pull/29205) ([Kseniia Sumarokova](https://github.com/kssenii)). In the meantime, the `web` disk type (static dataset hosted on a web server) is graduated from being experimental to be production ready. * Allow to use asynchronous reads for remote filesystems. Lower the number of seeks while reading from remote filesystems. It improves performance tremendously and makes the experimental `web` and `s3` disks to work faster than EBS under certain conditions. [#29205](https://github.com/ClickHouse/ClickHouse/pull/29205) ([Kseniia Sumarokova](https://github.com/kssenii)). In the meantime, the `web` disk type (static dataset hosted on a web server) is graduated from being experimental to be production ready.
* 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)). * 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)).
* 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)).
* 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)).
* 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)). * 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)).
* 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)). * 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)).
* Add support for pushdown of `IS NULL`/`IS NOT NULL` to external databases (i.e. MySQL). [#29463](https://github.com/ClickHouse/ClickHouse/pull/29463) ([Azat Khuzhin](https://github.com/azat)). * Now clickhouse is using DNS cache while communicating with external S3. [#29999](https://github.com/ClickHouse/ClickHouse/pull/29999) ([alesapin](https://github.com/alesapin)).
* Add support for pushdown of `IS NULL`/`IS NOT NULL` to external databases (i.e. MySQL). [#29463](https://github.com/ClickHouse/ClickHouse/pull/29463) ([Azat Khuzhin](https://github.com/azat)). 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)).
* SELECT queries from Dictionary tables will use multiple threads. [#30500](https://github.com/ClickHouse/ClickHouse/pull/30500) ([Maksim Kita](https://github.com/kitaisreal)). * SELECT queries from Dictionary tables will use multiple threads. [#30500](https://github.com/ClickHouse/ClickHouse/pull/30500) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance for filtering (WHERE operation) of `Decimal` columns. [#30431](https://github.com/ClickHouse/ClickHouse/pull/30431) ([Jun Jin](https://github.com/vesslanjin)). * Improve performance for filtering (WHERE operation) of `Decimal` columns. [#30431](https://github.com/ClickHouse/ClickHouse/pull/30431) ([Jun Jin](https://github.com/vesslanjin)).
* 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)). * 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)).
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* Removed sub-optimal mutation notifications in `StorageMergeTree` when merges are still going. [#27552](https://github.com/ClickHouse/ClickHouse/pull/27552) ([Vladimir Chebotarev](https://github.com/excitoon)). * Removed sub-optimal mutation notifications in `StorageMergeTree` when merges are still going. [#27552](https://github.com/ClickHouse/ClickHouse/pull/27552) ([Vladimir Chebotarev](https://github.com/excitoon)).
* Attempt to improve performance of string comparison. [#28767](https://github.com/ClickHouse/ClickHouse/pull/28767) ([alexey-milovidov](https://github.com/alexey-milovidov)). * Attempt to improve performance of string comparison. [#28767](https://github.com/ClickHouse/ClickHouse/pull/28767) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Primary key index and partition filter can work in tuple. [#29281](https://github.com/ClickHouse/ClickHouse/pull/29281) ([凌涛](https://github.com/lingtaolf)). * Primary key index and partition filter can work in tuple. [#29281](https://github.com/ClickHouse/ClickHouse/pull/29281) ([凌涛](https://github.com/lingtaolf)).
* If query has multiple quantile aggregate functions with the same arguments but different level parameter, they will be fused together and executed in one pass if the setting `optimize_syntax_fuse_functions` is enabled. [#26657](https://github.com/ClickHouse/ClickHouse/pull/26657) ([hexiaoting](https://github.com/hexiaoting)).
* Now min-max aggregation over the first expression of primary key is optimized by projection. This is for [#329](https://github.com/ClickHouse/ClickHouse/issues/329). [#29918](https://github.com/ClickHouse/ClickHouse/pull/29918) ([Amos Bird](https://github.com/amosbird)).
#### Experimental Feature #### Experimental Feature
* If query has multiple quantile aggregate functions with the same arguments but different level parameter, they will be fused together and executed in one pass if the setting `optimize_syntax_fuse_functions` is enabled. Note: this setting will be renamed in future releases. [#26657](https://github.com/ClickHouse/ClickHouse/pull/26657) ([hexiaoting](https://github.com/hexiaoting)).
* 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)). * 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)).
* Add `sparkbar` aggregate function. This closes [#26175](https://github.com/ClickHouse/ClickHouse/issues/26175). [#27481](https://github.com/ClickHouse/ClickHouse/pull/27481) ([小路](https://github.com/nicelulu)). Note: there is one flaw in this function, the behaviour will be changed in future releases.
#### Improvement #### Improvement
* Resolve table dependencies on metadata loading. Closes [#8004](https://github.com/ClickHouse/ClickHouse/issues/8004), closes [#15170](https://github.com/ClickHouse/ClickHouse/issues/15170). [#28373](https://github.com/ClickHouse/ClickHouse/pull/28373) ([tavplubix](https://github.com/tavplubix)). * Allow user to change log levels without restart. [#29586](https://github.com/ClickHouse/ClickHouse/pull/29586) ([Nikolay Degterinsky](https://github.com/evillique)).
* Multiple improvements for SQL UDF. Queries for manipulation of SQL User Defined Functions now support ON CLUSTER clause. 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)). Support `CREATE OR REPLACE`, `CREATE IF NOT EXISTS` syntaxes. [#30454](https://github.com/ClickHouse/ClickHouse/pull/30454) ([Maksim Kita](https://github.com/kitaisreal)). 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)). 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)). Support SQL user defined functions for `clickhouse-local`. [#30179](https://github.com/ClickHouse/ClickHouse/pull/30179) ([Maksim Kita](https://github.com/kitaisreal)).
* Enable per-query memory profiler (set to `memory_profiler_step` = 4MiB) globally. [#29455](https://github.com/ClickHouse/ClickHouse/pull/29455) ([Azat Khuzhin](https://github.com/azat)).
* 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)).
* 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)).
* Correctly resolve interdependencies between tables on server startup. Closes [#8004](https://github.com/ClickHouse/ClickHouse/issues/8004), closes [#15170](https://github.com/ClickHouse/ClickHouse/issues/15170). [#28373](https://github.com/ClickHouse/ClickHouse/pull/28373) ([tavplubix](https://github.com/tavplubix)).
* Avoid error "Division by zero" when denominator is Nullable in functions `divide`, `intDiv` and `modulo`. Closes [#22621](https://github.com/ClickHouse/ClickHouse/issues/22621). [#28352](https://github.com/ClickHouse/ClickHouse/pull/28352) ([Kruglov Pavel](https://github.com/Avogar)). * Avoid error "Division by zero" when denominator is Nullable in functions `divide`, `intDiv` and `modulo`. Closes [#22621](https://github.com/ClickHouse/ClickHouse/issues/22621). [#28352](https://github.com/ClickHouse/ClickHouse/pull/28352) ([Kruglov Pavel](https://github.com/Avogar)).
* Support `ALTER TABLE` for tables in `Memory` databases. [#30866](https://github.com/ClickHouse/ClickHouse/pull/30866) ([tavplubix](https://github.com/tavplubix)).
* 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)). * 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)).
* Arrays of all serializable types are now supported by arrayStringConcat. [#30840](https://github.com/ClickHouse/ClickHouse/pull/30840) ([Nickita Taranov](https://github.com/nickitat)). * Web UI: render bars in table cells. [#29792](https://github.com/ClickHouse/ClickHouse/pull/29792) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* 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)). * 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)). 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)).
* 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)). * Introduce `compiled_expression_cache_elements_size` setting. If you will ever want to use this setting, you will already know what it does. [#30667](https://github.com/ClickHouse/ClickHouse/pull/30667) ([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)). * clickhouse-format now supports option `--query`. In previous versions you have to pass the query to stdin. [#29325](https://github.com/ClickHouse/ClickHouse/pull/29325) ([凌涛](https://github.com/lingtaolf)).
* SQLUserDefinedFunctions support `CREATE OR REPLACE`, `CREATE IF NOT EXISTS` syntaxes. [#30454](https://github.com/ClickHouse/ClickHouse/pull/30454) ([Maksim Kita](https://github.com/kitaisreal)). * Support `ALTER TABLE` for tables in `Memory` databases. Memory databases are used in `clickhouse-local`. [#30866](https://github.com/ClickHouse/ClickHouse/pull/30866) ([tavplubix](https://github.com/tavplubix)).
* 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)). * Arrays of all serializable types are now supported by `arrayStringConcat`. [#30840](https://github.com/ClickHouse/ClickHouse/pull/30840) ([Nickita Taranov](https://github.com/nickitat)).
* 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)). * ClickHouse now will account docker/cgroups limitations to get system memory amount. See [#25662](https://github.com/ClickHouse/ClickHouse/issues/25662). [#30574](https://github.com/ClickHouse/ClickHouse/pull/30574) ([Pavel Medvedev](https://github.com/pmed)).
* More full support of positional arguments. [#30433](https://github.com/ClickHouse/ClickHouse/pull/30433) ([Kseniia Sumarokova](https://github.com/kssenii)). * Fetched table structure for PostgreSQL database is more reliable now. [#30477](https://github.com/ClickHouse/ClickHouse/pull/30477) ([Kseniia Sumarokova](https://github.com/kssenii)).
* 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)). * Full support of positional arguments in GROUP BY and ORDER BY. [#30433](https://github.com/ClickHouse/ClickHouse/pull/30433) ([Kseniia Sumarokova](https://github.com/kssenii)).
* 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 extracting non-string element as string using JSONExtractString. This is for [pull/25452#issuecomment-927123287](https://github.com/ClickHouse/ClickHouse/pull/25452#issuecomment-927123287). [#30426](https://github.com/ClickHouse/ClickHouse/pull/30426) ([Amos Bird](https://github.com/amosbird)).
* 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)).
* 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) ([tavplubix](https://github.com/tavplubix)). * 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) ([tavplubix](https://github.com/tavplubix)).
* 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)). * 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)).
* Fixed comparison of Date32 with Date, DateTime, DateTime64, String. [#30219](https://github.com/ClickHouse/ClickHouse/pull/30219) ([liang.huang](https://github.com/lhuang09287750)). * Fixed comparison of `Date32` with `Date`, `DateTime`, `DateTime64` and `String`. [#30219](https://github.com/ClickHouse/ClickHouse/pull/30219) ([liang.huang](https://github.com/lhuang09287750)).
* 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)). * 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)).
* Support SQL user defined functions for clickhouse-local. [#30179](https://github.com/ClickHouse/ClickHouse/pull/30179) ([Maksim Kita](https://github.com/kitaisreal)).
* 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)). * 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)).
* Now clickhouse-client supports native multi-line editing. [#30143](https://github.com/ClickHouse/ClickHouse/pull/30143) ([Amos Bird](https://github.com/amosbird)). * Now `clickhouse-client` supports native multi-line editing. [#30143](https://github.com/ClickHouse/ClickHouse/pull/30143) ([Amos Bird](https://github.com/amosbird)).
* 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)). * `polygon` dictionaries (reverse geocoding): added support for reading the dictionary content with SELECT query 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)).
* 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)). * Add ClickHouse logo to Play UI. [#29674](https://github.com/ClickHouse/ClickHouse/pull/29674) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* 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)).
* 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)).
* 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)).
* Now clickhouse use DNS cache while communicating with external S3. [#29999](https://github.com/ClickHouse/ClickHouse/pull/29999) ([alesapin](https://github.com/alesapin)).
* Fix data-race between flush() and startup() in StorageBuffer. [#29930](https://github.com/ClickHouse/ClickHouse/pull/29930) ([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 lock-order-inversion between periodic dictionary reload and config reload. [#29928](https://github.com/ClickHouse/ClickHouse/pull/29928) ([Azat Khuzhin](https://github.com/azat)).
* 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)). * 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 data-race between flush and startup in `Buffer` tables. This can appear in tests. [#29930](https://github.com/ClickHouse/ClickHouse/pull/29930) ([Azat Khuzhin](https://github.com/azat)).
* Fix `lock-order-inversion` between `DROP TABLE` for `DatabaseMemory` and `LiveView`. Live View is an experimental feature. Memory database is used in clickhouse-local. [#29929](https://github.com/ClickHouse/ClickHouse/pull/29929) ([Azat Khuzhin](https://github.com/azat)).
* 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)).
* Update zoneinfo files to 2021c. [#29925](https://github.com/ClickHouse/ClickHouse/pull/29925) ([alexey-milovidov](https://github.com/alexey-milovidov)). * Update zoneinfo files to 2021c. [#29925](https://github.com/ClickHouse/ClickHouse/pull/29925) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* 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)). * 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)).
* 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 `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)).
* 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)). * Add ability to trace peak memory usage (with new trace_type in `system.trace_log` - `MemoryPeak`). [#29858](https://github.com/ClickHouse/ClickHouse/pull/29858) ([Azat Khuzhin](https://github.com/azat)).
* 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)). * PostgreSQL foreign tables: 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)).
* 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)). * Apply `max_untracked_memory`/`memory_profiler_step`/`memory_profiler_sample_probability` during mutate/merge to profile memory usage during merges. [#29681](https://github.com/ClickHouse/ClickHouse/pull/29681) ([Azat Khuzhin](https://github.com/azat)).
* Web UI: render bars in table cells. [#29792](https://github.com/ClickHouse/ClickHouse/pull/29792) ([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)).
* 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)).
* 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)).
* Add ClickHouse logo to Play UI. [#29674](https://github.com/ClickHouse/ClickHouse/pull/29674) ([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)).
* 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)). * 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)).
* 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)). * Fix incorrect Nullable processing of JSON functions. 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)).
* 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)). * 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)).
* Allow user to change log levels without restart. [#29586](https://github.com/ClickHouse/ClickHouse/pull/29586) ([Nikolay Degterinsky](https://github.com/evillique)).
* 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)). * 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)).
* 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)). * 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)).
* 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) ([tavplubix](https://github.com/tavplubix)). * 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) ([tavplubix](https://github.com/tavplubix)).
* Enable per-query memory profiler (set to memory_profiler_step=4MiB) globally. [#29455](https://github.com/ClickHouse/ClickHouse/pull/29455) ([Azat Khuzhin](https://github.com/azat)).
* 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)).
* 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)). * 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)).
* Added setting `use_skip_indexes`. [#29405](https://github.com/ClickHouse/ClickHouse/pull/29405) ([Maksim Kita](https://github.com/kitaisreal)). * Added setting `use_skip_indexes`. [#29405](https://github.com/ClickHouse/ClickHouse/pull/29405) ([Maksim Kita](https://github.com/kitaisreal)).
* fix lost in memory part when freeze. [#29376](https://github.com/ClickHouse/ClickHouse/pull/29376) ([Mo Xuan](https://github.com/mo-avatar)). * Add support for `FREEZE`ing in-memory parts (for backups). [#29376](https://github.com/ClickHouse/ClickHouse/pull/29376) ([Mo Xuan](https://github.com/mo-avatar)).
* 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)). * 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)).
* Skip indexes `tokenbf_v1` and `ngrambf_v1`: added support for `Array` data type with key of `String` of `FixedString` type. [#29280](https://github.com/ClickHouse/ClickHouse/pull/29280) ([Maksim Kita](https://github.com/kitaisreal)). Skip indexes `tokenbf_v1` and `ngrambf_v1` added support for `Map` data type with key of `String` of `FixedString` type. Author @lingtaolf. [#29220](https://github.com/ClickHouse/ClickHouse/pull/29220) ([Maksim Kita](https://github.com/kitaisreal)).
* Function `has`: added support for `Map` data type. [#29267](https://github.com/ClickHouse/ClickHouse/pull/29267) ([Maksim Kita](https://github.com/kitaisreal)).
* Skip indexes `tokenbf_v1` and `ngrambf_v1` added support for Array data type with key of String of FixedString type. [#29280](https://github.com/ClickHouse/ClickHouse/pull/29280) ([Maksim Kita](https://github.com/kitaisreal)). * Add `compress_logs` settings for clickhouse-keeper which allow to compress clickhouse-keeper logs (for replicated state machine) in `ZSTD` . Implements: [#26977](https://github.com/ClickHouse/ClickHouse/issues/26977). [#29223](https://github.com/ClickHouse/ClickHouse/pull/29223) ([alesapin](https://github.com/alesapin)).
* Function `has` added support for map data type. [#29267](https://github.com/ClickHouse/ClickHouse/pull/29267) ([Maksim Kita](https://github.com/kitaisreal)). * Add a setting `external_table_strict_query` - it will force passing the whole WHERE expression in queries to foreign databases even if it is incompatible. [#29206](https://github.com/ClickHouse/ClickHouse/pull/29206) ([Azat Khuzhin](https://github.com/azat)).
* Add `compress_logs` settings for clickhouse-keeper which allow to compress clickhouse-keeper logs in `ZSTD` . Implements: [#26977](https://github.com/ClickHouse/ClickHouse/issues/26977). [#29223](https://github.com/ClickHouse/ClickHouse/pull/29223) ([alesapin](https://github.com/alesapin)). * Disable projections when `ARRAY JOIN` is used. In previous versions projection analysis may break aliases in array join. [#29139](https://github.com/ClickHouse/ClickHouse/pull/29139) ([Amos Bird](https://github.com/amosbird)).
* Skip indexes `tokenbf_v1` and `ngrambf_v1` added support for Map data type with key of String of FixedString type. Author @lingtaolf. [#29220](https://github.com/ClickHouse/ClickHouse/pull/29220) ([Maksim Kita](https://github.com/kitaisreal)). * Support more types in `MsgPack` input/output format. [#29077](https://github.com/ClickHouse/ClickHouse/pull/29077) ([Kruglov Pavel](https://github.com/Avogar)).
* Add ability to disable converting expressions to local filter for external queries (`external_table_strict_query=true`). [#29206](https://github.com/ClickHouse/ClickHouse/pull/29206) ([Azat Khuzhin](https://github.com/azat)). * Allow to input and output `LowCardinality` columns in `ORC` input/output format. [#29062](https://github.com/ClickHouse/ClickHouse/pull/29062) ([Kruglov Pavel](https://github.com/Avogar)).
* Added an ability to execute more merges and mutations than the number of threads in background pool. Merges and mutations will be executed step by step according to their sizes (lower is more prioritized). The ratio of the number of tasks to threads to execute is controlled by a setting `background_merges_mutations_concurrency_ratio`, 2 by default. [#29140](https://github.com/ClickHouse/ClickHouse/pull/29140) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Disable projections when `ARRAY JOIN` is used. Currently projection analysis will break array join aliases. [#29139](https://github.com/ClickHouse/ClickHouse/pull/29139) ([Amos Bird](https://github.com/amosbird)).
* Fix possible LogicalError, support more types in MsgPack input/output format. [#29077](https://github.com/ClickHouse/ClickHouse/pull/29077) ([Kruglov Pavel](https://github.com/Avogar)).
* Allow to input and output LowCardinality columns in ORC input/output format. [#29062](https://github.com/ClickHouse/ClickHouse/pull/29062) ([Kruglov Pavel](https://github.com/Avogar)).
* Select from `system.distributed_ddl_queue` might show incorrect values, it's fixed. [#29061](https://github.com/ClickHouse/ClickHouse/pull/29061) ([tavplubix](https://github.com/tavplubix)). * Select from `system.distributed_ddl_queue` might show incorrect values, it's fixed. [#29061](https://github.com/ClickHouse/ClickHouse/pull/29061) ([tavplubix](https://github.com/tavplubix)).
* Correct behaviour with unknown methods for http connection. Solves [#29050](https://github.com/ClickHouse/ClickHouse/issues/29050). [#29057](https://github.com/ClickHouse/ClickHouse/pull/29057) ([Filatenkov Artur](https://github.com/FArthur-cmd)). * Correct behaviour with unknown methods for HTTP connection. Solves [#29050](https://github.com/ClickHouse/ClickHouse/issues/29050). [#29057](https://github.com/ClickHouse/ClickHouse/pull/29057) ([Filatenkov Artur](https://github.com/FArthur-cmd)).
* Fix bug in `clickhouse-keeper-converter` which can lead to some data loss while restoring from ZooKeeper logs (not snapshot). [#29030](https://github.com/ClickHouse/ClickHouse/pull/29030) ([小路](https://github.com/nicelulu)). * `clickhouse-keeper`: Fix bug in `clickhouse-keeper-converter` which can lead to some data loss while restoring from ZooKeeper logs (not snapshot). [#29030](https://github.com/ClickHouse/ClickHouse/pull/29030) ([小路](https://github.com/nicelulu)). Fix bug in `clickhouse-keeper-converter` which can lead to incorrect ZooKeeper log deserialization. [#29071](https://github.com/ClickHouse/ClickHouse/pull/29071) ([小路](https://github.com/nicelulu)).
* Apply settings from CREATE AS SELECT queries (fixes: [#28810](https://github.com/ClickHouse/ClickHouse/issues/28810)). [#28962](https://github.com/ClickHouse/ClickHouse/pull/28962) ([Azat Khuzhin](https://github.com/azat)). * Apply settings from `CREATE ... AS SELECT` queries (fixes: [#28810](https://github.com/ClickHouse/ClickHouse/issues/28810)). [#28962](https://github.com/ClickHouse/ClickHouse/pull/28962) ([Azat Khuzhin](https://github.com/azat)).
* add default database setting for alter table ... on cluster ... replace/move partition from/to ... [#28955](https://github.com/ClickHouse/ClickHouse/pull/28955) ([anneji-dev](https://github.com/anneji-dev)). * Respect default database setting for ALTER TABLE ... ON CLUSTER ... REPLACE/MOVE PARTITION FROM/TO ... [#28955](https://github.com/ClickHouse/ClickHouse/pull/28955) ([anneji-dev](https://github.com/anneji-dev)).
* gRPC: Allow change server-side compression from client. [#28953](https://github.com/ClickHouse/ClickHouse/pull/28953) ([Vitaly Baranov](https://github.com/vitlibar)). * gRPC protocol: Allow change server-side compression from client. [#28953](https://github.com/ClickHouse/ClickHouse/pull/28953) ([Vitaly Baranov](https://github.com/vitlibar)).
* Skip "no data" exception when reading thermal sensors for asynchronous metrics. This closes [#28852](https://github.com/ClickHouse/ClickHouse/issues/28852). [#28882](https://github.com/ClickHouse/ClickHouse/pull/28882) ([alexey-milovidov](https://github.com/alexey-milovidov)). * Skip "no data" exception when reading thermal sensors for asynchronous metrics. This closes [#28852](https://github.com/ClickHouse/ClickHouse/issues/28852). [#28882](https://github.com/ClickHouse/ClickHouse/pull/28882) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed race condition that might cause `Dictionary not found` error for existing dictionary in rare cases. [#28853](https://github.com/ClickHouse/ClickHouse/pull/28853) ([tavplubix](https://github.com/tavplubix)). * Fixed logical race condition that might cause `Dictionary not found` error for existing dictionary in rare cases. [#28853](https://github.com/ClickHouse/ClickHouse/pull/28853) ([tavplubix](https://github.com/tavplubix)).
* Relax nested function for If-combinator check (but forbid nested identical combinators). [#28828](https://github.com/ClickHouse/ClickHouse/pull/28828) ([Azat Khuzhin](https://github.com/azat)). * Relax nested function for If-combinator check (but forbid nested identical combinators). [#28828](https://github.com/ClickHouse/ClickHouse/pull/28828) ([Azat Khuzhin](https://github.com/azat)).
* Fix uncaught exception during server termination. [#28761](https://github.com/ClickHouse/ClickHouse/pull/28761) ([Azat Khuzhin](https://github.com/azat)). * Fix possible uncaught exception during server termination. [#28761](https://github.com/ClickHouse/ClickHouse/pull/28761) ([Azat Khuzhin](https://github.com/azat)).
* Forbid cleaning of tmp directories that can be used by an active mutation/merge. [#28760](https://github.com/ClickHouse/ClickHouse/pull/28760) ([Azat Khuzhin](https://github.com/azat)). * Forbid cleaning of tmp directories that can be used by an active mutation/merge if mutation/merge is extraordinarily long. [#28760](https://github.com/ClickHouse/ClickHouse/pull/28760) ([Azat Khuzhin](https://github.com/azat)).
* Allow optimization : `optimize_arithmetic_operations_in_aggregate_functions = 1` when alias is used. I cannot figure out why it was disabled. We set aliases in all other TreeOptimizers, except this one. Maybe I'm missing something important) @4ertus2 could you give a bad example?. [#28746](https://github.com/ClickHouse/ClickHouse/pull/28746) ([Amos Bird](https://github.com/amosbird)). * Allow optimization `optimize_arithmetic_operations_in_aggregate_functions = 1` when alias is used. [#28746](https://github.com/ClickHouse/ClickHouse/pull/28746) ([Amos Bird](https://github.com/amosbird)).
* Implement `detach_not_byte_identical_parts` setting for `ReplicatedMergeTree`, that will detach instead of remove not byte-identical parts (after mege/mutate). [#28708](https://github.com/ClickHouse/ClickHouse/pull/28708) ([Azat Khuzhin](https://github.com/azat)). * Implement `detach_not_byte_identical_parts` setting for `ReplicatedMergeTree`, that will detach instead of remove not byte-identical parts (after mege/mutate). [#28708](https://github.com/ClickHouse/ClickHouse/pull/28708) ([Azat Khuzhin](https://github.com/azat)).
* Implement `max_suspicious_broken_parts_bytes` setting for `MergeTree` (to limit total size of all broken parts, default is `1GiB`). [#28707](https://github.com/ClickHouse/ClickHouse/pull/28707) ([Azat Khuzhin](https://github.com/azat)). * Implement `max_suspicious_broken_parts_bytes` setting for `MergeTree` (to limit total size of all broken parts, default is `1GiB`). [#28707](https://github.com/ClickHouse/ClickHouse/pull/28707) ([Azat Khuzhin](https://github.com/azat)).
* This PR enables expanding macros in RabbitMQ settings, for example:. [#28683](https://github.com/ClickHouse/ClickHouse/pull/28683) ([Vitaly Baranov](https://github.com/vitlibar)). * Enable expanding macros in `RabbitMQ` table settings. [#28683](https://github.com/ClickHouse/ClickHouse/pull/28683) ([Vitaly Baranov](https://github.com/vitlibar)).
* Restore the possibility to read data of a table using the `Log` engine in multiple threads. [#28125](https://github.com/ClickHouse/ClickHouse/pull/28125) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix misbehavior of NULL column handling in JSON functions. This fixes [#27930](https://github.com/ClickHouse/ClickHouse/issues/27930). [#28012](https://github.com/ClickHouse/ClickHouse/pull/28012) ([Amos Bird](https://github.com/amosbird)).
* Reload stacktrace cache when symbol is reloaded. [#28137](https://github.com/ClickHouse/ClickHouse/pull/28137) ([Amos Bird](https://github.com/amosbird)). * Allow to set the size of Mark/Uncompressed cache for skip indices separately from columns. [#27961](https://github.com/ClickHouse/ClickHouse/pull/27961) ([Amos Bird](https://github.com/amosbird)).
* This PR allows reading data of a table using the `Log` engine in multiple threads. [#28125](https://github.com/ClickHouse/ClickHouse/pull/28125) ([Vitaly Baranov](https://github.com/vitlibar)). * Allow to mix JOIN with `USING` with other JOIN types. [#23881](https://github.com/ClickHouse/ClickHouse/pull/23881) ([darkkeks](https://github.com/darkkeks)).
* Fix misbehavior of NULL column handling in json functions. This fixes [#27930](https://github.com/ClickHouse/ClickHouse/issues/27930). [#28012](https://github.com/ClickHouse/ClickHouse/pull/28012) ([Amos Bird](https://github.com/amosbird)). * Update aws-sdk submodule for throttling in Yandex Cloud S3. [#30646](https://github.com/ClickHouse/ClickHouse/pull/30646) ([ianton-ru](https://github.com/ianton-ru)).
* Add dedicated Mark/Uncompressed cache for skip indices. Not sure how to test it properly. [#27961](https://github.com/ClickHouse/ClickHouse/pull/27961) ([Amos Bird](https://github.com/amosbird)). * Fix releasing query ID and session ID at the end of query processing while handing gRPC call. [#29954](https://github.com/ClickHouse/ClickHouse/pull/29954) ([Vitaly Baranov](https://github.com/vitlibar)).
* Correct `Codec(AES_128_GCM_SIV)`. [#27476](https://github.com/ClickHouse/ClickHouse/pull/27476) ([Filatenkov Artur](https://github.com/FArthur-cmd)). * Fix shutdown of `AccessControlManager` to fix flaky test. [#29951](https://github.com/ClickHouse/ClickHouse/pull/29951) ([Vitaly Baranov](https://github.com/vitlibar)).
* - Allow to mix using join with other join types. [#23881](https://github.com/ClickHouse/ClickHouse/pull/23881) ([darkkeks](https://github.com/darkkeks)).
#### Build/Testing/Packaging Improvement #### Build/Testing/Packaging Improvement
* Add support for FreeBSD builds for Aarch64 machines. [#29952](https://github.com/ClickHouse/ClickHouse/pull/29952) ([MikaelUrankar](https://github.com/MikaelUrankar)). * Add support for FreeBSD builds for Aarch64 machines. [#29952](https://github.com/ClickHouse/ClickHouse/pull/29952) ([MikaelUrankar](https://github.com/MikaelUrankar)).
* Recursive submodules are no longer needed for ClickHouse. [#30315](https://github.com/ClickHouse/ClickHouse/pull/30315) ([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)).
* 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)). * 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)).
* 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)). * Enable `Protobuf`, `Arrow`, `ORC`, `Parquet` for `AArch64` and `Darwin` (macOS) 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 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)). * 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)).
* 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)). * 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)).
* Implemented structure-aware fuzzing approach in ClickHouse for select statement parser. [#30012](https://github.com/ClickHouse/ClickHouse/pull/30012) ([Paul](https://github.com/PaulCher)). * Implemented structure-aware fuzzing approach in ClickHouse for select statement parser. [#30012](https://github.com/ClickHouse/ClickHouse/pull/30012) ([Paul](https://github.com/PaulCher)).
@ -210,14 +178,14 @@
* Reduce Debug build binary size by clang optimization option. [#28736](https://github.com/ClickHouse/ClickHouse/pull/28736) ([flynn](https://github.com/ucasfl)). * Reduce Debug build binary size by clang optimization option. [#28736](https://github.com/ClickHouse/ClickHouse/pull/28736) ([flynn](https://github.com/ucasfl)).
* Now all images for CI will be placed in the separate dockerhub repo. [#28656](https://github.com/ClickHouse/ClickHouse/pull/28656) ([alesapin](https://github.com/alesapin)). * Now all images for CI will be placed in the separate dockerhub repo. [#28656](https://github.com/ClickHouse/ClickHouse/pull/28656) ([alesapin](https://github.com/alesapin)).
* Improve support for build with clang-13. [#28046](https://github.com/ClickHouse/ClickHouse/pull/28046) ([Sergei Semin](https://github.com/syominsergey)). * Improve support for build with clang-13. [#28046](https://github.com/ClickHouse/ClickHouse/pull/28046) ([Sergei Semin](https://github.com/syominsergey)).
* 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)).
* Add time dependency for clickhouse-server unit (systemd and sysvinit init). [#28891](https://github.com/ClickHouse/ClickHouse/pull/28891) ([Azat Khuzhin](https://github.com/azat)). * Add time dependency for clickhouse-server unit (systemd and sysvinit init). [#28891](https://github.com/ClickHouse/ClickHouse/pull/28891) ([Azat Khuzhin](https://github.com/azat)).
* Reload stacktrace cache when symbol is reloaded. [#28137](https://github.com/ClickHouse/ClickHouse/pull/28137) ([Amos Bird](https://github.com/amosbird)).
#### Bug Fix (user-visible misbehaviour in official stable or prestable release) #### Bug Fix
* Functions for case-insensitive search in UTF-8 strings like `positionCaseInsensitiveUTF8` and `countSubstringsCaseInsensitiveUTF8` might find substrings that actually does not match in very rare cases, it's fixed. [#30663](https://github.com/ClickHouse/ClickHouse/pull/30663) ([tavplubix](https://github.com/tavplubix)).
* Fix reading from empty file on encrypted disk. [#30494](https://github.com/ClickHouse/ClickHouse/pull/30494) ([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)).
* 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 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 bug in `clickhouse-keeper-converter` which can lead to incorrect ZooKeeper log deserialization. [#29071](https://github.com/ClickHouse/ClickHouse/pull/29071) ([小路](https://github.com/nicelulu)).
* Fix transformation of disjunctions chain to `IN` (controlled by settings `optimize_min_equality_disjunction_chain_length`) in distributed queries with settings `legacy_column_name_of_tuple_literal = 0`. [#28658](https://github.com/ClickHouse/ClickHouse/pull/28658) ([Anton Popov](https://github.com/CurtizJ)). * Fix transformation of disjunctions chain to `IN` (controlled by settings `optimize_min_equality_disjunction_chain_length`) in distributed queries with settings `legacy_column_name_of_tuple_literal = 0`. [#28658](https://github.com/ClickHouse/ClickHouse/pull/28658) ([Anton Popov](https://github.com/CurtizJ)).
* Allow using a materialized column as the sharding key in a distributed table even if `insert_allow_materialized_columns=0`:. [#28637](https://github.com/ClickHouse/ClickHouse/pull/28637) ([Vitaly Baranov](https://github.com/vitlibar)). * Allow using a materialized column as the sharding key in a distributed table even if `insert_allow_materialized_columns=0`:. [#28637](https://github.com/ClickHouse/ClickHouse/pull/28637) ([Vitaly Baranov](https://github.com/vitlibar)).
* 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)). * 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)).
@ -227,22 +195,19 @@
* Clean temporary directory when localBackup failed by some reason. [#30797](https://github.com/ClickHouse/ClickHouse/pull/30797) ([ianton-ru](https://github.com/ianton-ru)). * 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 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) ([tavplubix](https://github.com/tavplubix)). * 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) ([tavplubix](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)). * Fix PREWHERE with WHERE in case of always true PREWHERE. [#30668](https://github.com/ClickHouse/ClickHouse/pull/30668) ([Azat Khuzhin](https://github.com/azat)).
* 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) ([tavplubix](https://github.com/tavplubix)).
* Update aws-sdk submodule for throttling in Yandex.S3. [#30646](https://github.com/ClickHouse/ClickHouse/pull/30646) ([ianton-ru](https://github.com/ianton-ru)).
* 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)). * 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)).
* 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)). * 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)).
* * 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)). * 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)).
* Fixed segfault which might happen if session expired during execution of REPLACE PARTITION. [#30432](https://github.com/ClickHouse/ClickHouse/pull/30432) ([tavplubix](https://github.com/tavplubix)). * Fixed segfault which might happen if session expired during execution of REPLACE PARTITION. [#30432](https://github.com/ClickHouse/ClickHouse/pull/30432) ([tavplubix](https://github.com/tavplubix)).
* 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)).
* 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)). * 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)).
* 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)). * 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)).
* fix replaceRegexpAll bug. [#30292](https://github.com/ClickHouse/ClickHouse/pull/30292) ([Memo](https://github.com/Joeywzr)). * Fix some deficiency in `replaceRegexpAll` function. [#30292](https://github.com/ClickHouse/ClickHouse/pull/30292) ([Memo](https://github.com/Joeywzr)).
* Fix ComplexKeyHashedDictionary, ComplexKeySparseHashedDictionary parsing `preallocate` option from layout config. [#30246](https://github.com/ClickHouse/ClickHouse/pull/30246) ([Maksim Kita](https://github.com/kitaisreal)). * Fix ComplexKeyHashedDictionary, ComplexKeySparseHashedDictionary parsing `preallocate` option from layout config. [#30246](https://github.com/ClickHouse/ClickHouse/pull/30246) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix `[I]LIKE` function. Closes [#28661](https://github.com/ClickHouse/ClickHouse/issues/28661). [#30244](https://github.com/ClickHouse/ClickHouse/pull/30244) ([Nikolay Degterinsky](https://github.com/evillique)). * Fix `[I]LIKE` function. Closes [#28661](https://github.com/ClickHouse/ClickHouse/issues/28661). [#30244](https://github.com/ClickHouse/ClickHouse/pull/30244) ([Nikolay Degterinsky](https://github.com/evillique)).
* Fix crash with shortcircuit and lowcardinality in multiIf. [#30243](https://github.com/ClickHouse/ClickHouse/pull/30243) ([Raúl Marín](https://github.com/Algunenano)). * Fix crash with shortcircuit and lowcardinality in multiIf. [#30243](https://github.com/ClickHouse/ClickHouse/pull/30243) ([Raúl Marín](https://github.com/Algunenano)).
* FlatDictionary, HashedDictionary fix bytes_allocated calculation for nullable attributes. [#30238](https://github.com/ClickHouse/ClickHouse/pull/30238) ([Maksim Kita](https://github.com/kitaisreal)). * FlatDictionary, HashedDictionary fix bytes_allocated calculation for nullable attributes. [#30238](https://github.com/ClickHouse/ClickHouse/pull/30238) ([Maksim Kita](https://github.com/kitaisreal)).
* * Allow identifiers staring with numbers in multiple joins. [#30230](https://github.com/ClickHouse/ClickHouse/pull/30230) ([Vladimir C](https://github.com/vdimir)). * Allow identifiers starting with numbers in multiple joins. [#30230](https://github.com/ClickHouse/ClickHouse/pull/30230) ([Vladimir C](https://github.com/vdimir)).
* 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)). * Fix reading from `MergeTree` with `max_read_buffer_size = 0` (when the user wants to shoot himself in the foot) (can lead to exceptions `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)).
* 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 `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 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 INSERT SELECT incorrectly fills MATERIALIZED column based of Nullable column. [#30189](https://github.com/ClickHouse/ClickHouse/pull/30189) ([Azat Khuzhin](https://github.com/azat)).
* Support nullable arguments in function `initializeAggregation`. [#30177](https://github.com/ClickHouse/ClickHouse/pull/30177) ([Anton Popov](https://github.com/CurtizJ)). * Support nullable arguments in function `initializeAggregation`. [#30177](https://github.com/ClickHouse/ClickHouse/pull/30177) ([Anton Popov](https://github.com/CurtizJ)).
@ -304,8 +269,6 @@
* Fix "Column is not under aggregate function and not in GROUP BY" with PREWHERE (Fixes: [#28461](https://github.com/ClickHouse/ClickHouse/issues/28461)). [#28502](https://github.com/ClickHouse/ClickHouse/pull/28502) ([Azat Khuzhin](https://github.com/azat)). * Fix "Column is not under aggregate function and not in GROUP BY" with PREWHERE (Fixes: [#28461](https://github.com/ClickHouse/ClickHouse/issues/28461)). [#28502](https://github.com/ClickHouse/ClickHouse/pull/28502) ([Azat Khuzhin](https://github.com/azat)).
### ClickHouse release v21.10, 2021-10-16 ### ClickHouse release v21.10, 2021-10-16
#### Backward Incompatible Change #### Backward Incompatible Change