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## ClickHouse release 20.6
## ClickHouse release v20.6.2.15-prestable FIXME as compared to v20.5.4.40-stable
### ClickHouse release v20.6.3.28-stable
#### New Feature
* Implementation of PostgreSQL-like ILIKE operator for https://github.com/ClickHouse/ClickHouse/issues/11710. [#12125](https://github.com/ClickHouse/ClickHouse/pull/12125) ([Mike](https://github.com/myrrc)).
* Support RIGHT and FULL JOIN with `set join_algorithm=partial_merge`. Only ALL strictness is supported (ANY, SEMI, ANTI, ASOF are not). [#12118](https://github.com/ClickHouse/ClickHouse/pull/12118) ([Artem Zuikov](https://github.com/4ertus2)).
* Add a function initializedAggregation to initialize an aggregation based on a single value. [#12109](https://github.com/ClickHouse/ClickHouse/pull/12109) ([Guillaume Tassery](https://github.com/YiuRULE)).
* #4006 Support ALTER TABLE ... [ADD|MODIFY] COLUMN ... FIRST. [#12073](https://github.com/ClickHouse/ClickHouse/pull/12073) ([Winter Zhang](https://github.com/zhang2014)).
* add function `parseDateTimeBestEffortUS`. [#12028](https://github.com/ClickHouse/ClickHouse/pull/12028) ([flynn](https://github.com/ucasFL)).
* Switched paths in S3 metadata to relative which allows to handle S3 blobs more easily. [#11892](https://github.com/ClickHouse/ClickHouse/pull/11892) ([Vladimir Chebotarev](https://github.com/excitoon)).
* Initial implementation of `EXPLAIN` query. Syntax: `EXPLAIN SELECT ...`. This fixes [#1118](https://github.com/ClickHouse/ClickHouse/issues/1118). [#11873](https://github.com/ClickHouse/ClickHouse/pull/11873) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Add ORCBlockOutputFormat. [#11662](https://github.com/ClickHouse/ClickHouse/pull/11662) ([Kruglov Pavel](https://github.com/Avogar)).
* Add storage RabbitMQ. [#11069](https://github.com/ClickHouse/ClickHouse/pull/11069) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Added new in-memory format of parts in `MergeTree`-family tables, which stores data in memory. Parts are written on disk at first merge. Part will be created in in-memory format if its size in rows or bytes is below thresholds `min_rows_for_compact_part` and `min_bytes_for_compact_part`. Also optional support of Write-Ahead-Log is available, which is enabled by default and is controlled by setting `in_memory_parts_enable_wal`. [#10697](https://github.com/ClickHouse/ClickHouse/pull/10697) ([Anton Popov](https://github.com/CurtizJ)).
* Implemented PostgreSQL-like `ILIKE` operator for [#11710](https://github.com/ClickHouse/ClickHouse/issues/11710). [#12125](https://github.com/ClickHouse/ClickHouse/pull/12125) ([Mike](https://github.com/myrrc)).
* Supported RIGHT and FULL JOIN with `set join_algorithm=partial_merge`. Only ALL strictness is allowed (ANY, SEMI, ANTI, ASOF are not). [#12118](https://github.com/ClickHouse/ClickHouse/pull/12118) ([Artem Zuikov](https://github.com/4ertus2)).
* Added a function `initializedAggregation` to initialize an aggregation based on a single value. [#12109](https://github.com/ClickHouse/ClickHouse/pull/12109) ([Guillaume Tassery](https://github.com/YiuRULE)).
* Supported `ALTER TABLE ... [ADD|MODIFY] COLUMN ... FIRST` [#4006](https://github.com/ClickHouse/ClickHouse/issues/4006). [#12073](https://github.com/ClickHouse/ClickHouse/pull/12073) ([Winter Zhang](https://github.com/zhang2014)).
* Added function `parseDateTimeBestEffortUS`. [#12028](https://github.com/ClickHouse/ClickHouse/pull/12028) ([flynn](https://github.com/ucasFL)).
* Added an initial implementation of `EXPLAIN` query. Syntax: `EXPLAIN SELECT ...`. This fixes [#1118](https://github.com/ClickHouse/ClickHouse/issues/1118). [#11873](https://github.com/ClickHouse/ClickHouse/pull/11873) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Added `ORCBlockOutputFormat`. [#11662](https://github.com/ClickHouse/ClickHouse/pull/11662) ([Kruglov Pavel](https://github.com/Avogar)).
* Added storage `RabbitMQ`. [#11069](https://github.com/ClickHouse/ClickHouse/pull/11069) ([Kseniia Sumarokova](https://github.com/kssenii)).
#### Bug Fix
* Fix wrong index analysis with functions. It could lead to pruning wrong parts, while reading from `MergeTree` tables. Fixes [#13060](https://github.com/ClickHouse/ClickHouse/issues/13060). Fixes [#12406](https://github.com/ClickHouse/ClickHouse/issues/12406). [#13081](https://github.com/ClickHouse/ClickHouse/pull/13081) ([Anton Popov](https://github.com/CurtizJ)).
* Fix error `Cannot convert column because it is constant but values of constants are different in source and result` for remote queries which use deterministic functions in scope of query, but not deterministic between queries, like `now()`, `now64()`, `randConstant()`. Fixes [#11327](https://github.com/ClickHouse/ClickHouse/issues/11327). [#13075](https://github.com/ClickHouse/ClickHouse/pull/13075) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix unnecessary limiting for the number of threads for selects from local replica. [#12840](https://github.com/ClickHouse/ClickHouse/pull/12840) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix rare bug when `ALTER DELETE` and `ALTER MODIFY COLUMN` queries executed simultaneously as a single mutation. Bug leads to an incorrect amount of rows in `count.txt` and as a consequence incorrect data in part. Also, fix a small bug with simultaneous `ALTER RENAME COLUMN` and `ALTER ADD COLUMN`. [#12760](https://github.com/ClickHouse/ClickHouse/pull/12760) ([alesapin](https://github.com/alesapin)).
* Fix CAST(Nullable(String), Enum()). [#12745](https://github.com/ClickHouse/ClickHouse/pull/12745) ([Azat Khuzhin](https://github.com/azat)).
* Fix performance with large tuples, which are interpreted as functions in `IN` section. The case when user write `WHERE x IN tuple(1, 2, ...)` instead of `WHERE x IN (1, 2, ...)` for some obscure reason. [#12700](https://github.com/ClickHouse/ClickHouse/pull/12700) ([Anton Popov](https://github.com/CurtizJ)).
* Fix memory tracking for input_format_parallel_parsing (by attaching thread to group). [#12672](https://github.com/ClickHouse/ClickHouse/pull/12672) ([Azat Khuzhin](https://github.com/azat)).
* fixes [#10572](https://github.com/ClickHouse/ClickHouse/issues/10572) fix bloom filter index with const expression. [#12659](https://github.com/ClickHouse/ClickHouse/pull/12659) ([Winter Zhang](https://github.com/zhang2014)).
* Fix SIGSEGV in StorageKafka when broker is unavailable (and not only). [#12658](https://github.com/ClickHouse/ClickHouse/pull/12658) ([Azat Khuzhin](https://github.com/azat)).
* Add support for function `if` with `Array(UUID)` arguments. This fixes [#11066](https://github.com/ClickHouse/ClickHouse/issues/11066). [#12648](https://github.com/ClickHouse/ClickHouse/pull/12648) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed `aggregate function any(x) is found inside another aggregate function in query` error with `SET optimize_move_functions_out_of_any = 1` and aliases inside `any()`. [#13419](https://github.com/ClickHouse/ClickHouse/pull/13419) ([Artem Zuikov](https://github.com/4ertus2)).
* Fixed `PrettyCompactMonoBlock` for clickhouse-local. Fixed extremes/totals with `PrettyCompactMonoBlock`. This fixes [#7746](https://github.com/ClickHouse/ClickHouse/issues/7746). [#13394](https://github.com/ClickHouse/ClickHouse/pull/13394) ([Azat Khuzhin](https://github.com/azat)).
* Fixed possible error `Totals having transform was already added to pipeline` in case of a query from delayed replica. [#13290](https://github.com/ClickHouse/ClickHouse/pull/13290) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* The server may crash if user passed specifically crafted arguments to the function `h3ToChildren`. This fixes [#13275](https://github.com/ClickHouse/ClickHouse/issues/13275). [#13277](https://github.com/ClickHouse/ClickHouse/pull/13277) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed potentially low performance and slightly incorrect result for `uniqExact`, `topK`, `sumDistinct` and similar aggregate functions called on Float types with NaN values. It also triggered assert in debug build. This fixes [#12491](https://github.com/ClickHouse/ClickHouse/issues/12491). [#13254](https://github.com/ClickHouse/ClickHouse/pull/13254) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed function if with nullable constexpr as cond that is not literal NULL. Fixes [#12463](https://github.com/ClickHouse/ClickHouse/issues/12463). [#13226](https://github.com/ClickHouse/ClickHouse/pull/13226) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed assert in `arrayElement` function in case of array elements are Nullable and array subscript is also Nullable. This fixes [#12172](https://github.com/ClickHouse/ClickHouse/issues/12172). [#13224](https://github.com/ClickHouse/ClickHouse/pull/13224) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed `DateTime64` conversion functions with constant argument. [#13205](https://github.com/ClickHouse/ClickHouse/pull/13205) ([Azat Khuzhin](https://github.com/azat)).
* Fixed wrong index analysis with functions. It could lead to pruning wrong parts, while reading from `MergeTree` tables. Fixes [#13060](https://github.com/ClickHouse/ClickHouse/issues/13060). Fixes [#12406](https://github.com/ClickHouse/ClickHouse/issues/12406). [#13081](https://github.com/ClickHouse/ClickHouse/pull/13081) ([Anton Popov](https://github.com/CurtizJ)).
* Fixed error `Cannot convert column because it is constant but values of constants are different in source and result` for remote queries which use deterministic functions in scope of query, but not deterministic between queries, like `now()`, `now64()`, `randConstant()`. Fixes [#11327](https://github.com/ClickHouse/ClickHouse/issues/11327). [#13075](https://github.com/ClickHouse/ClickHouse/pull/13075) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed unnecessary limiting for the number of threads for selects from local replica. [#12840](https://github.com/ClickHouse/ClickHouse/pull/12840) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed rare bug when `ALTER DELETE` and `ALTER MODIFY COLUMN` queries executed simultaneously as a single mutation. Bug leads to an incorrect amount of rows in `count.txt` and as a consequence incorrect data in part. Also, fix a small bug with simultaneous `ALTER RENAME COLUMN` and `ALTER ADD COLUMN`. [#12760](https://github.com/ClickHouse/ClickHouse/pull/12760) ([alesapin](https://github.com/alesapin)).
* Fixed `CAST(Nullable(String), Enum())`. [#12745](https://github.com/ClickHouse/ClickHouse/pull/12745) ([Azat Khuzhin](https://github.com/azat)).
* Fixed a performance with large tuples, which are interpreted as functions in `IN` section. The case when user write `WHERE x IN tuple(1, 2, ...)` instead of `WHERE x IN (1, 2, ...)` for some obscure reason. [#12700](https://github.com/ClickHouse/ClickHouse/pull/12700) ([Anton Popov](https://github.com/CurtizJ)).
* Fixed memory tracking for `input_format_parallel_parsing` (by attaching thread to group). [#12672](https://github.com/ClickHouse/ClickHouse/pull/12672) ([Azat Khuzhin](https://github.com/azat)).
* Fixed bloom filter index with const expression. This fixes [#10572](https://github.com/ClickHouse/ClickHouse/issues/10572). [#12659](https://github.com/ClickHouse/ClickHouse/pull/12659) ([Winter Zhang](https://github.com/zhang2014)).
* Fixed `SIGSEGV` in `StorageKafka` when broker is unavailable (and not only). [#12658](https://github.com/ClickHouse/ClickHouse/pull/12658) ([Azat Khuzhin](https://github.com/azat)).
* Added support for function `if` with `Array(UUID)` arguments. This fixes [#11066](https://github.com/ClickHouse/ClickHouse/issues/11066). [#12648](https://github.com/ClickHouse/ClickHouse/pull/12648) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* `CREATE USER IF NOT EXISTS` now doesn't throw exception if the user exists. This fixes [#12507](https://github.com/ClickHouse/ClickHouse/issues/12507). [#12646](https://github.com/ClickHouse/ClickHouse/pull/12646) ([Vitaly Baranov](https://github.com/vitlibar)).
* Better exception message in disk access storage. [#12625](https://github.com/ClickHouse/ClickHouse/pull/12625) ([alesapin](https://github.com/alesapin)).
* Fix lack of aliases with function `any`. [#12593](https://github.com/ClickHouse/ClickHouse/pull/12593) ([Anton Popov](https://github.com/CurtizJ)).
* Fix race condition in external dictionaries with cache layout which can lead server crash. [#12566](https://github.com/ClickHouse/ClickHouse/pull/12566) ([alesapin](https://github.com/alesapin)).
* The function `groupArrayMoving*` was not working for distributed queries. It's result was calculated within incorrect data type (without promotion to the largest type). The function `groupArrayMovingAvg` was returning integer number that was inconsistent with the `avg` function. This fixes [#12568](https://github.com/ClickHouse/ClickHouse/issues/12568). [#12622](https://github.com/ClickHouse/ClickHouse/pull/12622) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed lack of aliases with function `any`. [#12593](https://github.com/ClickHouse/ClickHouse/pull/12593) ([Anton Popov](https://github.com/CurtizJ)).
* Fixed race condition in external dictionaries with cache layout which can lead server crash. [#12566](https://github.com/ClickHouse/ClickHouse/pull/12566) ([alesapin](https://github.com/alesapin)).
* Remove data for Distributed tables (blocks from async INSERTs) on DROP TABLE. [#12556](https://github.com/ClickHouse/ClickHouse/pull/12556) ([Azat Khuzhin](https://github.com/azat)).
* Fix bug which lead to broken old parts after `ALTER DELETE` query when `enable_mixed_granularity_parts=1`. Fixes [#12536](https://github.com/ClickHouse/ClickHouse/issues/12536). [#12543](https://github.com/ClickHouse/ClickHouse/pull/12543) ([alesapin](https://github.com/alesapin)).
* Fixed bug which lead to broken old parts after `ALTER DELETE` query when `enable_mixed_granularity_parts=1`. Fixes [#12536](https://github.com/ClickHouse/ClickHouse/issues/12536). [#12543](https://github.com/ClickHouse/ClickHouse/pull/12543) ([alesapin](https://github.com/alesapin)).
* Better exception for function `in` with invalid number of arguments. [#12529](https://github.com/ClickHouse/ClickHouse/pull/12529) ([Anton Popov](https://github.com/CurtizJ)).
* Fixing race condition in live view tables which could cause data duplication. [#12519](https://github.com/ClickHouse/ClickHouse/pull/12519) ([vzakaznikov](https://github.com/vzakaznikov)).
* Fixed performance issue, while reading from compact parts. [#12492](https://github.com/ClickHouse/ClickHouse/pull/12492) ([Anton Popov](https://github.com/CurtizJ)).
* Fix backwards compatibility in binary format of `AggregateFunction(avg, ...)` values. This fixes [#12342](https://github.com/ClickHouse/ClickHouse/issues/12342). [#12486](https://github.com/ClickHouse/ClickHouse/pull/12486) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix SETTINGS parse after FORMAT. [#12480](https://github.com/ClickHouse/ClickHouse/pull/12480) ([Azat Khuzhin](https://github.com/azat)).
* SystemLog: do not write to ordinary server log under mutex. This can lead to deadlock if `text_log` is enabled. [#12452](https://github.com/ClickHouse/ClickHouse/pull/12452) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix overflow when very large LIMIT or OFFSET is specified. This fixes [#10470](https://github.com/ClickHouse/ClickHouse/issues/10470). This fixes [#11372](https://github.com/ClickHouse/ClickHouse/issues/11372). [#12427](https://github.com/ClickHouse/ClickHouse/pull/12427) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed possible segfault if StorageMerge. Closes [#12054](https://github.com/ClickHouse/ClickHouse/issues/12054). [#12401](https://github.com/ClickHouse/ClickHouse/pull/12401) ([tavplubix](https://github.com/tavplubix)).
* Reverts change introduced in [#11079](https://github.com/ClickHouse/ClickHouse/issues/11079) to resolve [#12098](https://github.com/ClickHouse/ClickHouse/issues/12098). [#12397](https://github.com/ClickHouse/ClickHouse/pull/12397) ([Mike](https://github.com/myrrc)).
* Fixed backwards compatibility in binary format of `AggregateFunction(avg, ...)` values. This fixes [#12342](https://github.com/ClickHouse/ClickHouse/issues/12342). [#12486](https://github.com/ClickHouse/ClickHouse/pull/12486) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed SETTINGS parse after FORMAT. [#12480](https://github.com/ClickHouse/ClickHouse/pull/12480) ([Azat Khuzhin](https://github.com/azat)).
* Fixed the deadlock if `text_log` is enabled. [#12452](https://github.com/ClickHouse/ClickHouse/pull/12452) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed overflow when very large `LIMIT` or `OFFSET` is specified. This fixes [#10470](https://github.com/ClickHouse/ClickHouse/issues/10470). This fixes [#11372](https://github.com/ClickHouse/ClickHouse/issues/11372). [#12427](https://github.com/ClickHouse/ClickHouse/pull/12427) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed possible segfault if `StorageMerge`. This fixes [#12054](https://github.com/ClickHouse/ClickHouse/issues/12054). [#12401](https://github.com/ClickHouse/ClickHouse/pull/12401) ([tavplubix](https://github.com/tavplubix)).
* Reverted change introduced in [#11079](https://github.com/ClickHouse/ClickHouse/issues/11079) to resolve [#12098](https://github.com/ClickHouse/ClickHouse/issues/12098). [#12397](https://github.com/ClickHouse/ClickHouse/pull/12397) ([Mike](https://github.com/myrrc)).
* Additional check for arguments of bloom filter index. This fixes [#11408](https://github.com/ClickHouse/ClickHouse/issues/11408). [#12388](https://github.com/ClickHouse/ClickHouse/pull/12388) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Avoid exception when negative or floating point constant is used in WHERE condition for indexed tables. This fixes [#11905](https://github.com/ClickHouse/ClickHouse/issues/11905). [#12384](https://github.com/ClickHouse/ClickHouse/pull/12384) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Allow to CLEAR column even if there are depending DEFAULT expressions. This fixes [#12333](https://github.com/ClickHouse/ClickHouse/issues/12333). [#12378](https://github.com/ClickHouse/ClickHouse/pull/12378) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix TOTALS/ROLLUP/CUBE for aggregate functions with `-State` and `Nullable` arguments. This fixes [#12163](https://github.com/ClickHouse/ClickHouse/issues/12163). [#12376](https://github.com/ClickHouse/ClickHouse/pull/12376) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix error message and exit codes for `ALTER RENAME COLUMN` queries, when `RENAME` is not allowed. Fixes [#12301](https://github.com/ClickHouse/ClickHouse/issues/12301) and [#12303](https://github.com/ClickHouse/ClickHouse/issues/12303). [#12335](https://github.com/ClickHouse/ClickHouse/pull/12335) ([alesapin](https://github.com/alesapin)).
* Fix very rare race condition in ReplicatedMergeTreeQueue. [#12315](https://github.com/ClickHouse/ClickHouse/pull/12315) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Allowed to `CLEAR` column even if there are depending `DEFAULT` expressions. This fixes [#12333](https://github.com/ClickHouse/ClickHouse/issues/12333). [#12378](https://github.com/ClickHouse/ClickHouse/pull/12378) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix `TOTALS/ROLLUP/CUBE` for aggregate functions with `-State` and `Nullable` arguments. This fixes [#12163](https://github.com/ClickHouse/ClickHouse/issues/12163). [#12376](https://github.com/ClickHouse/ClickHouse/pull/12376) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed error message and exit codes for `ALTER RENAME COLUMN` queries, when `RENAME` is not allowed. Fixes [#12301](https://github.com/ClickHouse/ClickHouse/issues/12301) and [#12303](https://github.com/ClickHouse/ClickHouse/issues/12303). [#12335](https://github.com/ClickHouse/ClickHouse/pull/12335) ([alesapin](https://github.com/alesapin)).
* Fixed very rare race condition in `ReplicatedMergeTreeQueue`. [#12315](https://github.com/ClickHouse/ClickHouse/pull/12315) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* When using codec `Delta` or `DoubleDelta` with non fixed width types, exception with code `LOGICAL_ERROR` was returned instead of exception with code `BAD_ARGUMENTS` (we ensure that exceptions with code logical error never happen). This fixes [#12110](https://github.com/ClickHouse/ClickHouse/issues/12110). [#12308](https://github.com/ClickHouse/ClickHouse/pull/12308) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix order of columns in `WITH FILL` modifier. Previously order of columns of `ORDER BY` statement wasn't respected. [#12306](https://github.com/ClickHouse/ClickHouse/pull/12306) ([Anton Popov](https://github.com/CurtizJ)).
* Fixed order of columns in `WITH FILL` modifier. Previously order of columns of `ORDER BY` statement wasn't respected. [#12306](https://github.com/ClickHouse/ClickHouse/pull/12306) ([Anton Popov](https://github.com/CurtizJ)).
* Avoid "bad cast" exception when there is an expression that filters data by virtual columns (like `_table` in `Merge` tables) or by "index" columns in system tables such as filtering by database name when querying from `system.tables`, and this expression returns `Nullable` type. This fixes [#12166](https://github.com/ClickHouse/ClickHouse/issues/12166). [#12305](https://github.com/ClickHouse/ClickHouse/pull/12305) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix TTL after renaming column, on which depends TTL expression. [#12304](https://github.com/ClickHouse/ClickHouse/pull/12304) ([Anton Popov](https://github.com/CurtizJ)).
* kafka: fix SIGSEGV if there is an message with error in the middle of the batch. [#12302](https://github.com/ClickHouse/ClickHouse/pull/12302) ([Azat Khuzhin](https://github.com/azat)).
* Some threads might randomly hang for a few seconds during DNS cache updating. It's fixed. [#12296](https://github.com/ClickHouse/ClickHouse/pull/12296) ([tavplubix](https://github.com/tavplubix)).
* Fix typo in setting name. [#12292](https://github.com/ClickHouse/ClickHouse/pull/12292) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Show error after TrieDictionary failed to load. [#12290](https://github.com/ClickHouse/ClickHouse/pull/12290) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fixed `TTL` after renaming column, on which depends TTL expression. [#12304](https://github.com/ClickHouse/ClickHouse/pull/12304) ([Anton Popov](https://github.com/CurtizJ)).
* Fixed SIGSEGV if there is an message with error in the middle of the batch in `Kafka` Engine. [#12302](https://github.com/ClickHouse/ClickHouse/pull/12302) ([Azat Khuzhin](https://github.com/azat)).
* Fixed the situation when some threads might randomly hang for a few seconds during `DNS` cache updating. [#12296](https://github.com/ClickHouse/ClickHouse/pull/12296) ([tavplubix](https://github.com/tavplubix)).
* Fixed typo in setting name. [#12292](https://github.com/ClickHouse/ClickHouse/pull/12292) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Show error after `TrieDictionary` failed to load. [#12290](https://github.com/ClickHouse/ClickHouse/pull/12290) ([Vitaly Baranov](https://github.com/vitlibar)).
* The function `arrayFill` worked incorrectly for empty arrays that may lead to crash. This fixes [#12263](https://github.com/ClickHouse/ClickHouse/issues/12263). [#12279](https://github.com/ClickHouse/ClickHouse/pull/12279) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Implement conversions to the common type for LowCardinality types. This allows to execute UNION ALL of tables with columns of LowCardinality and other columns. This fixes [#8212](https://github.com/ClickHouse/ClickHouse/issues/8212). This fixes [#4342](https://github.com/ClickHouse/ClickHouse/issues/4342). [#12275](https://github.com/ClickHouse/ClickHouse/pull/12275) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Not for changelog. Cherry-pick after [#12196](https://github.com/ClickHouse/ClickHouse/issues/12196). [#12271](https://github.com/ClickHouse/ClickHouse/pull/12271) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed behaviour on reaching redirect limit in request to S3 storage. [#12256](https://github.com/ClickHouse/ClickHouse/pull/12256) ([ianton-ru](https://github.com/ianton-ru)).
* Implement conversions to the common type for `LowCardinality` types. This allows to execute UNION ALL of tables with columns of LowCardinality and other columns. This fixes [#8212](https://github.com/ClickHouse/ClickHouse/issues/8212). This fixes [#4342](https://github.com/ClickHouse/ClickHouse/issues/4342). [#12275](https://github.com/ClickHouse/ClickHouse/pull/12275) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed the behaviour on reaching redirect limit in request to `S3` storage. [#12256](https://github.com/ClickHouse/ClickHouse/pull/12256) ([ianton-ru](https://github.com/ianton-ru)).
* Fixed the behaviour when during multiple sequential inserts in `StorageFile` header for some special types was written more than once. This fixed [#6155](https://github.com/ClickHouse/ClickHouse/issues/6155). [#12197](https://github.com/ClickHouse/ClickHouse/pull/12197) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Fixed logical functions for UInt8 values when they are not equal to 0 or 1. [#12196](https://github.com/ClickHouse/ClickHouse/pull/12196) ([Alexander Kazakov](https://github.com/Akazz)).
* Cap max_memory_usage* limits to the process resident memory. [#12182](https://github.com/ClickHouse/ClickHouse/pull/12182) ([Azat Khuzhin](https://github.com/azat)).
* Fix dictGet arguments check during GROUP BY injective functions elimination. [#12179](https://github.com/ClickHouse/ClickHouse/pull/12179) ([Azat Khuzhin](https://github.com/azat)).
* Fix dictGet arguments check during `GROUP BY` injective functions elimination. [#12179](https://github.com/ClickHouse/ClickHouse/pull/12179) ([Azat Khuzhin](https://github.com/azat)).
* Fixed the behaviour when `SummingMergeTree` engine sums up columns from partition key. Added an exception in case of explicit definition of columns to sum which intersects with partition key columns. This fixes [#7867](https://github.com/ClickHouse/ClickHouse/issues/7867). [#12173](https://github.com/ClickHouse/ClickHouse/pull/12173) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Don't split the dictionary source's table name into schema and table name itself if ODBC connection doesn't support schema. [#12165](https://github.com/ClickHouse/ClickHouse/pull/12165) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix wrong logic in ALTER DELETE that leads to deleting of records when condition evaluates to NULL. This fixes [#9088](https://github.com/ClickHouse/ClickHouse/issues/9088). This closes [#12106](https://github.com/ClickHouse/ClickHouse/issues/12106). [#12153](https://github.com/ClickHouse/ClickHouse/pull/12153) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix transform of query to send to external DBMS (e.g. MySQL, ODBC) in presense of aliases. This fixes [#12032](https://github.com/ClickHouse/ClickHouse/issues/12032). [#12151](https://github.com/ClickHouse/ClickHouse/pull/12151) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix bad code in redundant ORDER BY optimization. The bug was introduced in [#10067](https://github.com/ClickHouse/ClickHouse/issues/10067). [#12148](https://github.com/ClickHouse/ClickHouse/pull/12148) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix potential overflow in integer division. This fixes [#12119](https://github.com/ClickHouse/ClickHouse/issues/12119). [#12140](https://github.com/ClickHouse/ClickHouse/pull/12140) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix potential infinite loop in `greatCircleDistance`, `geoDistance`. This fixes [#12117](https://github.com/ClickHouse/ClickHouse/issues/12117). [#12137](https://github.com/ClickHouse/ClickHouse/pull/12137) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed wrong logic in `ALTER DELETE` that leads to deleting of records when condition evaluates to NULL. This fixes [#9088](https://github.com/ClickHouse/ClickHouse/issues/9088). This closes [#12106](https://github.com/ClickHouse/ClickHouse/issues/12106). [#12153](https://github.com/ClickHouse/ClickHouse/pull/12153) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed transform of query to send to external DBMS (e.g. MySQL, ODBC) in presense of aliases. This fixes [#12032](https://github.com/ClickHouse/ClickHouse/issues/12032). [#12151](https://github.com/ClickHouse/ClickHouse/pull/12151) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed bad code in redundant ORDER BY optimization. The bug was introduced in [#10067](https://github.com/ClickHouse/ClickHouse/issues/10067). [#12148](https://github.com/ClickHouse/ClickHouse/pull/12148) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed potential overflow in integer division. This fixes [#12119](https://github.com/ClickHouse/ClickHouse/issues/12119). [#12140](https://github.com/ClickHouse/ClickHouse/pull/12140) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed potential infinite loop in `greatCircleDistance`, `geoDistance`. This fixes [#12117](https://github.com/ClickHouse/ClickHouse/issues/12117). [#12137](https://github.com/ClickHouse/ClickHouse/pull/12137) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Normalize "pid" file handling. In previous versions the server may refuse to start if it was killed without proper shutdown and if there is another process that has the same pid as previously runned server. Also pid file may be removed in unsuccessful server startup even if there is another server running. This fixes [#3501](https://github.com/ClickHouse/ClickHouse/issues/3501). [#12133](https://github.com/ClickHouse/ClickHouse/pull/12133) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix bug which leads to incorrect table metadata in ZooKeepeer for ReplicatedVersionedCollapsingMergeTree tables. Fixes [#12093](https://github.com/ClickHouse/ClickHouse/issues/12093). [#12121](https://github.com/ClickHouse/ClickHouse/pull/12121) ([alesapin](https://github.com/alesapin)).
* Fixed bug which leads to incorrect table metadata in ZooKeepeer for ReplicatedVersionedCollapsingMergeTree tables. Fixes [#12093](https://github.com/ClickHouse/ClickHouse/issues/12093). [#12121](https://github.com/ClickHouse/ClickHouse/pull/12121) ([alesapin](https://github.com/alesapin)).
* Avoid "There is no query" exception for materialized views with joins or with subqueries attached to system logs (system.query_log, metric_log, etc) or to engine=Buffer underlying table. [#12120](https://github.com/ClickHouse/ClickHouse/pull/12120) ([filimonov](https://github.com/filimonov)).
* Fix handling dependency of table with ENGINE=Dictionary on dictionary. This fixes [#10994](https://github.com/ClickHouse/ClickHouse/issues/10994). This fixes [#10397](https://github.com/ClickHouse/ClickHouse/issues/10397). [#12116](https://github.com/ClickHouse/ClickHouse/pull/12116) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fixed handling dependency of table with ENGINE=Dictionary on dictionary. This fixes [#10994](https://github.com/ClickHouse/ClickHouse/issues/10994). This fixes [#10397](https://github.com/ClickHouse/ClickHouse/issues/10397). [#12116](https://github.com/ClickHouse/ClickHouse/pull/12116) ([Vitaly Baranov](https://github.com/vitlibar)).
* Format `Parquet` now properly works with `LowCardinality` and `LowCardinality(Nullable)` types. Fixes [#12086](https://github.com/ClickHouse/ClickHouse/issues/12086), [#8406](https://github.com/ClickHouse/ClickHouse/issues/8406). [#12108](https://github.com/ClickHouse/ClickHouse/pull/12108) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix performance for selects with `UNION` caused by wrong limit for the total number of threads. Fixes [#12030](https://github.com/ClickHouse/ClickHouse/issues/12030). [#12103](https://github.com/ClickHouse/ClickHouse/pull/12103) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix segfault with `-StateResample` combinators. [#12092](https://github.com/ClickHouse/ClickHouse/pull/12092) ([Anton Popov](https://github.com/CurtizJ)).
* Fix empty `result_rows` and `result_bytes` metrics in `system.quey_log` for selects. Fixes [#11595](https://github.com/ClickHouse/ClickHouse/issues/11595). [#12089](https://github.com/ClickHouse/ClickHouse/pull/12089) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix unnecessary limiting the number of threads for selects from `VIEW`. Fixes [#11937](https://github.com/ClickHouse/ClickHouse/issues/11937). [#12085](https://github.com/ClickHouse/ClickHouse/pull/12085) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix SIGSEGV in StorageKafka on DROP TABLE. [#12075](https://github.com/ClickHouse/ClickHouse/pull/12075) ([Azat Khuzhin](https://github.com/azat)).
* Fix possible crash while using wrong type for `PREWHERE`. Fixes [#12053](https://github.com/ClickHouse/ClickHouse/issues/12053), [#12060](https://github.com/ClickHouse/ClickHouse/issues/12060). [#12060](https://github.com/ClickHouse/ClickHouse/pull/12060) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix error `Cannot capture column` for higher-order functions with `Tuple(LowCardinality)` argument. Fixes [#9766](https://github.com/ClickHouse/ClickHouse/issues/9766). [#12055](https://github.com/ClickHouse/ClickHouse/pull/12055) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix constraints check if constraint is a constant expression. This fixes [#11360](https://github.com/ClickHouse/ClickHouse/issues/11360). [#12042](https://github.com/ClickHouse/ClickHouse/pull/12042) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix wrong result and potential crash when invoking function `if` with arguments of type `FixedString` with different sizes. This fixes [#11362](https://github.com/ClickHouse/ClickHouse/issues/11362). [#12021](https://github.com/ClickHouse/ClickHouse/pull/12021) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed performance for selects with `UNION` caused by wrong limit for the total number of threads. Fixes [#12030](https://github.com/ClickHouse/ClickHouse/issues/12030). [#12103](https://github.com/ClickHouse/ClickHouse/pull/12103) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed segfault with `-StateResample` combinators. [#12092](https://github.com/ClickHouse/ClickHouse/pull/12092) ([Anton Popov](https://github.com/CurtizJ)).
* Fixed empty `result_rows` and `result_bytes` metrics in `system.quey_log` for selects. Fixes [#11595](https://github.com/ClickHouse/ClickHouse/issues/11595). [#12089](https://github.com/ClickHouse/ClickHouse/pull/12089) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed unnecessary limiting the number of threads for selects from `VIEW`. Fixes [#11937](https://github.com/ClickHouse/ClickHouse/issues/11937). [#12085](https://github.com/ClickHouse/ClickHouse/pull/12085) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed SIGSEGV in StorageKafka on DROP TABLE. [#12075](https://github.com/ClickHouse/ClickHouse/pull/12075) ([Azat Khuzhin](https://github.com/azat)).
* Fixed possible crash while using wrong type for `PREWHERE`. Fixes [#12053](https://github.com/ClickHouse/ClickHouse/issues/12053), [#12060](https://github.com/ClickHouse/ClickHouse/issues/12060). [#12060](https://github.com/ClickHouse/ClickHouse/pull/12060) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed error `Cannot capture column` for higher-order functions with `Tuple(LowCardinality)` argument. Fixes [#9766](https://github.com/ClickHouse/ClickHouse/issues/9766). [#12055](https://github.com/ClickHouse/ClickHouse/pull/12055) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed constraints check if constraint is a constant expression. This fixes [#11360](https://github.com/ClickHouse/ClickHouse/issues/11360). [#12042](https://github.com/ClickHouse/ClickHouse/pull/12042) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fixed wrong result and potential crash when invoking function `if` with arguments of type `FixedString` with different sizes. This fixes [#11362](https://github.com/ClickHouse/ClickHouse/issues/11362). [#12021](https://github.com/ClickHouse/ClickHouse/pull/12021) ([alexey-milovidov](https://github.com/alexey-milovidov)).
#### Improvement
* Allow to set JOIN kind and type in more standad way: `LEFT SEMI JOIN` instead of `SEMI LEFT JOIN`. For now both are correct. [#12520](https://github.com/ClickHouse/ClickHouse/pull/12520) ([Artem Zuikov](https://github.com/4ertus2)).
* Allowed to set `JOIN` kind and type in more standart way: `LEFT SEMI JOIN` instead of `SEMI LEFT JOIN`. For now both are correct. [#12520](https://github.com/ClickHouse/ClickHouse/pull/12520) ([Artem Zuikov](https://github.com/4ertus2)).
* lifetime_rows/lifetime_bytes for Buffer engine. [#12421](https://github.com/ClickHouse/ClickHouse/pull/12421) ([Azat Khuzhin](https://github.com/azat)).
* Write the detail exception message to the client instead of 'MySQL server has gone away'. [#12383](https://github.com/ClickHouse/ClickHouse/pull/12383) ([BohuTANG](https://github.com/BohuTANG)).
* This setting allows to chose charset for printing grids (either utf8 or ascii). [#12372](https://github.com/ClickHouse/ClickHouse/pull/12372) ([Sabyanin Maxim](https://github.com/s-mx)).
* 1. Support MySQL 'SELECT DATABASE()' [#9336](https://github.com/ClickHouse/ClickHouse/issues/9336) 2. Add MySQL replacement query integration test. [#12314](https://github.com/ClickHouse/ClickHouse/pull/12314) ([BohuTANG](https://github.com/BohuTANG)).
* Add `KILL QUERY [connection_id]` for the MySQL client/driver to cancel the long query, issue [#12038](https://github.com/ClickHouse/ClickHouse/issues/12038). [#12152](https://github.com/ClickHouse/ClickHouse/pull/12152) ([BohuTANG](https://github.com/BohuTANG)).
* Allows to change a charset which is used for printing grids borders. Available charsets are following: UTF-8, ASCII. Setting `output_format_pretty_grid_charset` enables this feature. [#12372](https://github.com/ClickHouse/ClickHouse/pull/12372) ([Sabyanin Maxim](https://github.com/s-mx)).
* Supported MySQL 'SELECT DATABASE()' [#9336](https://github.com/ClickHouse/ClickHouse/issues/9336) 2. Add MySQL replacement query integration test. [#12314](https://github.com/ClickHouse/ClickHouse/pull/12314) ([BohuTANG](https://github.com/BohuTANG)).
* Added `KILL QUERY [connection_id]` for the MySQL client/driver to cancel the long query, issue [#12038](https://github.com/ClickHouse/ClickHouse/issues/12038). [#12152](https://github.com/ClickHouse/ClickHouse/pull/12152) ([BohuTANG](https://github.com/BohuTANG)).
* Added support for `%g` (two digit ISO year) and `%G` (four digit ISO year) substitutions in `formatDateTime` function. [#12136](https://github.com/ClickHouse/ClickHouse/pull/12136) ([vivarum](https://github.com/vivarum)).
* Add 'type' column in system.disks. [#12115](https://github.com/ClickHouse/ClickHouse/pull/12115) ([ianton-ru](https://github.com/ianton-ru)).
* Improves `REVOKE` command: now it requires grant/admin option for only access which will be revoked. For example, to execute `REVOKE ALL ON *.* FROM user1` now it doesn't require to have full access rights granted with grant option. Added command `REVOKE ALL FROM user1` - it revokes all granted roles from `user1`. [#12083](https://github.com/ClickHouse/ClickHouse/pull/12083) ([Vitaly Baranov](https://github.com/vitlibar)).
* Added 'type' column in system.disks. [#12115](https://github.com/ClickHouse/ClickHouse/pull/12115) ([ianton-ru](https://github.com/ianton-ru)).
* Improved `REVOKE` command: now it requires grant/admin option for only access which will be revoked. For example, to execute `REVOKE ALL ON *.* FROM user1` now it doesn't require to have full access rights granted with grant option. Added command `REVOKE ALL FROM user1` - it revokes all granted roles from `user1`. [#12083](https://github.com/ClickHouse/ClickHouse/pull/12083) ([Vitaly Baranov](https://github.com/vitlibar)).
* Implemented single part uploads for DiskS3. [#12026](https://github.com/ClickHouse/ClickHouse/pull/12026) ([Vladimir Chebotarev](https://github.com/excitoon)).
* Add replica priority for load_balancing (for manual prioritization of the load balancing). [#11995](https://github.com/ClickHouse/ClickHouse/pull/11995) ([Azat Khuzhin](https://github.com/azat)).
* Improved performace of 'ORDER BY' and 'GROUP BY' by prefix of sorting key. [#11696](https://github.com/ClickHouse/ClickHouse/pull/11696) ([Anton Popov](https://github.com/CurtizJ)).
* Added replica priority for load_balancing (for manual prioritization of the load balancing). [#11995](https://github.com/ClickHouse/ClickHouse/pull/11995) ([Azat Khuzhin](https://github.com/azat)).
* Switched paths in S3 metadata to relative which allows to handle S3 blobs more easily. [#11892](https://github.com/ClickHouse/ClickHouse/pull/11892) ([Vladimir Chebotarev](https://github.com/excitoon)).
#### Performance Improvement
* Remove injective functions inside `uniq*()` if `set optimize_injective_functions_inside_uniq=1`. [#12337](https://github.com/ClickHouse/ClickHouse/pull/12337) ([Artem Zuikov](https://github.com/4ertus2)).
* Fix "[#10574](https://github.com/ClickHouse/ClickHouse/issues/10574) Index not used for IN operator with literals", performance regression introduced around v19.3. [#12062](https://github.com/ClickHouse/ClickHouse/pull/12062) ([nvartolomei](https://github.com/nvartolomei)).
* Removed injective functions inside `uniq*()` if `set optimize_injective_functions_inside_uniq=1`. [#12337](https://github.com/ClickHouse/ClickHouse/pull/12337) ([Ruslan Kamalov](https://github.com/kamalov-ruslan)).
* Index not used for IN operator with literals", performance regression introduced around v19.3. This fixes "[#10574](https://github.com/ClickHouse/ClickHouse/issues/10574). [#12062](https://github.com/ClickHouse/ClickHouse/pull/12062) ([nvartolomei](https://github.com/nvartolomei)).
* Improved performace of 'ORDER BY' and 'GROUP BY' by prefix of sorting key. [#11696](https://github.com/ClickHouse/ClickHouse/pull/11696) ([Anton Popov](https://github.com/CurtizJ)).
#### Experimental Feature
* Added new in-memory format of parts in `MergeTree`-family tables, which stores data in memory. Parts are written on disk at first merge. Part will be created in in-memory format if its size in rows or bytes is below thresholds `min_rows_for_compact_part` and `min_bytes_for_compact_part`. Also optional support of Write-Ahead-Log is available, which is enabled by default and is controlled by setting `in_memory_parts_enable_wal`. [#10697](https://github.com/ClickHouse/ClickHouse/pull/10697) ([Anton Popov](https://github.com/CurtizJ)).
#### Build/Testing/Packaging Improvement
* Implement AST-based query fuzzing mode for clickhouse-client. See [this label](https://github.com/ClickHouse/ClickHouse/issues?q=label%3Afuzz+is%3Aissue) for the list of issues we recently found by fuzzing. Most of them were found by this tool, and a couple by SQLancer and `00746_sql_fuzzy.pl`. [#12111](https://github.com/ClickHouse/ClickHouse/pull/12111) ([Alexander Kuzmenkov](https://github.com/akuzm)).
* Add new type of tests based on Testflows framework. [#12090](https://github.com/ClickHouse/ClickHouse/pull/12090) ([vzakaznikov](https://github.com/vzakaznikov)).
* Added S3 HTTPS integration test. [#12412](https://github.com/ClickHouse/ClickHouse/pull/12412) ([Pavel Kovalenko](https://github.com/Jokser)).
* Log sanitizer trap messages from separate thread. This will prevent possible deadlock under thread sanitizer. [#12313](https://github.com/ClickHouse/ClickHouse/pull/12313) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Now functional and stress tests will be able to run with old version of `clickhouse-test` script. [#12287](https://github.com/ClickHouse/ClickHouse/pull/12287) ([alesapin](https://github.com/alesapin)).
* Remove strange file creation during build in `orc`. [#12258](https://github.com/ClickHouse/ClickHouse/pull/12258) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Remove verbosity from the binary builds. [#12174](https://github.com/ClickHouse/ClickHouse/pull/12174) ([alesapin](https://github.com/alesapin)).
* Place common docker compose files to integration docker container. [#12168](https://github.com/ClickHouse/ClickHouse/pull/12168) ([Ilya Yatsishin](https://github.com/qoega)).
* Record additional detail on Dockerfile scan reports. [#12159](https://github.com/ClickHouse/ClickHouse/pull/12159) ([Ivan Blinkov](https://github.com/blinkov)).
* Fix warnings from CodeQL. `CodeQL` is another static analyzer that we will use along with `clang-tidy` and `PVS-Studio` that we use already. [#12138](https://github.com/ClickHouse/ClickHouse/pull/12138) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Missed `<atomic>` is required for `std::atomic<>`. [#12134](https://github.com/ClickHouse/ClickHouse/pull/12134) ([Matwey V. Kornilov](https://github.com/matwey)).
* Minor CMake fixes for UNBUNDLED build. [#12131](https://github.com/ClickHouse/ClickHouse/pull/12131) ([Matwey V. Kornilov](https://github.com/matwey)).
* Added a showcase of the minimal Docker image without using any Linux distribution. [#12126](https://github.com/ClickHouse/ClickHouse/pull/12126) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Perform an upgrade of system packages in the `clickhouse-server` docker image. [#12124](https://github.com/ClickHouse/ClickHouse/pull/12124) ([Ivan Blinkov](https://github.com/blinkov)).
* Implement AST-based query fuzzing mode for clickhouse-client. See [this label](https://github.com/ClickHouse/ClickHouse/issues?q=label%3Afuzz+is%3Aissue) for the list of issues we recently found by fuzzing. Most of them were found by this tool, and a couple by SQLancer and `00746_sql_fuzzy.pl`. [#12111](https://github.com/ClickHouse/ClickHouse/pull/12111) ([Alexander Kuzmenkov](https://github.com/akuzm)).
* Add `UNBUNDLED` flag to `system.build_options` table. Move skip lists for `clickhouse-test` to clickhouse repo. [#12107](https://github.com/ClickHouse/ClickHouse/pull/12107) ([alesapin](https://github.com/alesapin)).
* Regular check by [Anchore Container Analysis](https://docs.anchore.com) security analysis tool that looks for [CVE](https://cve.mitre.org/) in `clickhouse-server` Docker image. Also confirms that `Dockerfile` is buildable. Runs daily on `master` and on pull-requests to `Dockerfile`. [#12102](https://github.com/ClickHouse/ClickHouse/pull/12102) ([Ivan Blinkov](https://github.com/blinkov)).
* Daily check by [GitHub CodeQL](https://securitylab.github.com/tools/codeql) security analysis tool that looks for [CWE](https://cwe.mitre.org/). [#12101](https://github.com/ClickHouse/ClickHouse/pull/12101) ([Ivan Blinkov](https://github.com/blinkov)).
* Install `ca-certificates` before the first `apt-get update` in Dockerfile. [#12095](https://github.com/ClickHouse/ClickHouse/pull/12095) ([Ivan Blinkov](https://github.com/blinkov)).
* Add new type of tests based on Testflows framework. [#12090](https://github.com/ClickHouse/ClickHouse/pull/12090) ([vzakaznikov](https://github.com/vzakaznikov)).
#### NO CL CATEGORY
* ... [#12431](https://github.com/ClickHouse/ClickHouse/pull/12431) ([Tom Bombadil](https://github.com/ithangzhou)).
* * Not for changelog. [#12265](https://github.com/ClickHouse/ClickHouse/pull/12265) ([Alexander Kuzmenkov](https://github.com/akuzm)).
## ClickHouse release 20.5