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## ClickHouse release 20.9
### ClickHouse release v20.9.2.20-stable, 2020-09-22
#### New Feature
* Added util for database generation by query. [#14442](https://github.com/ClickHouse/ClickHouse/pull/14442) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)) [#10973](https://github.com/ClickHouse/ClickHouse/issues/10973) ([ZeDRoman](https://github.com/ZeDRoman)).
* Added an aggregate function RankCorrelationSpearman which simply computes a rank correlation coefficient. [#11769](https://github.com/ClickHouse/ClickHouse/pull/11769) ([antikvist](https://github.com/antikvist)) [#14411](https://github.com/ClickHouse/ClickHouse/pull/14411) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Added column transformers, which can be applied to selected columns. For example, you can write `select * apply(length) apply(max) from wide_string_table` to find out the maxium length of all string columns. [#14233](https://github.com/ClickHouse/ClickHouse/pull/14233) ([Amos Bird](https://github.com/amosbird)).
* Added table function `view` which turns an subquery into a table object. This helps passing queries around. For instance, it can be used in remote/cluster table functions. [#12567](https://github.com/ClickHouse/ClickHouse/pull/12567) ([Amos Bird](https://github.com/amosbird)).
#### Bug Fix
* Fixed incorrect comparison with primary key of type `FixedString`. This fixes https://github.com/ClickHouse/ClickHouse/issues/14908. [#15033](https://github.com/ClickHouse/ClickHouse/pull/15033) ([Amos Bird](https://github.com/amosbird)).
* If function `bar` was called with specifically crafter arguments, buffer overflow was possible. This closes [#13926](https://github.com/ClickHouse/ClickHouse/issues/13926). [#15028](https://github.com/ClickHouse/ClickHouse/pull/15028) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Publish CPU frequencies per logical core in `system.asynchronous_metrics`. This fixes https://github.com/ClickHouse/ClickHouse/issues/14923. [#14924](https://github.com/ClickHouse/ClickHouse/pull/14924) ([Alexander Kuzmenkov](https://github.com/akuzm)).
* Fixed `.metadata.tmp File exists` error when using `MaterializeMySQL` database engine. [#14898](https://github.com/ClickHouse/ClickHouse/pull/14898) ([Winter Zhang](https://github.com/zhang2014)).
* Fix the issue when some invocations of `extractAllGroups` function may trigger "Memory limit exceeded" error. This fixes [#13383](https://github.com/ClickHouse/ClickHouse/issues/13383). [#14889](https://github.com/ClickHouse/ClickHouse/pull/14889) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix SIGSEGV for an attempt to INSERT into StorageFile(fd). [#14887](https://github.com/ClickHouse/ClickHouse/pull/14887) ([Azat Khuzhin](https://github.com/azat)).
* Fix rare error in `SELECT` queries when the queried column has `DEFAULT` expression which depends on the other column which also has `DEFAULT` and not present in select query and not exists on disk. Partially fixes [#14531](https://github.com/ClickHouse/ClickHouse/issues/14531). [#14845](https://github.com/ClickHouse/ClickHouse/pull/14845) ([alesapin](https://github.com/alesapin)).
* Fix wrong monotonicity detection for shrunk `Int -> Int` cast of signed types. It might lead to incorrect query result. This bug is unveiled in [#14513](https://github.com/ClickHouse/ClickHouse/issues/14513). [#14783](https://github.com/ClickHouse/ClickHouse/pull/14783) ([Amos Bird](https://github.com/amosbird)).
* Fixed missed default database name in metadata of materialized view when executing `ALTER ... MODIFY QUERY`. [#14664](https://github.com/ClickHouse/ClickHouse/pull/14664) ([tavplubix](https://github.com/tavplubix)).
* Fix bug when `ALTER UPDATE` mutation with Nullable column in assignment expression and constant value (like `UPDATE x = 42`) leads to incorrect value in column or segfault. Fixes [#13634](https://github.com/ClickHouse/ClickHouse/issues/13634), [#14045](https://github.com/ClickHouse/ClickHouse/issues/14045). [#14646](https://github.com/ClickHouse/ClickHouse/pull/14646) ([alesapin](https://github.com/alesapin)).
* Fix wrong Decimal multiplication result caused wrong decimal scale of result column. [#14603](https://github.com/ClickHouse/ClickHouse/pull/14603) ([Artem Zuikov](https://github.com/4ertus2)).
* Added the checker as neither calling `lc->isNullable()` nor calling `ls->getDictionaryPtr()->isNullable()` would return the correct result. [#14591](https://github.com/ClickHouse/ClickHouse/pull/14591) ([Mike](https://github.com/myrrc)).
* Cleanup data directory after Zookeeper exceptions during CreateQuery for StorageReplicatedMergeTree Engine. [#14563](https://github.com/ClickHouse/ClickHouse/pull/14563) ([Bharat Nallan](https://github.com/bharatnc)).
* Fix rare segfaults in functions with combinator -Resample, which could appear in result of overflow with very large parameters. [#14562](https://github.com/ClickHouse/ClickHouse/pull/14562) ([Anton Popov](https://github.com/CurtizJ)).
* Fixed the incorrect sorting order of `Nullable` column. This fixes [#14344](https://github.com/ClickHouse/ClickHouse/issues/14344). [#14495](https://github.com/ClickHouse/ClickHouse/pull/14495) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Check for array size overflow in `topK` aggregate function. Without this check the user may send a query with carefully crafter parameters that will lead to server crash. This closes [#14452](https://github.com/ClickHouse/ClickHouse/issues/14452). [#14467](https://github.com/ClickHouse/ClickHouse/pull/14467) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Proxy restart/start/stop/reload of SysVinit to systemd (if it is used). [#14460](https://github.com/ClickHouse/ClickHouse/pull/14460) ([Azat Khuzhin](https://github.com/azat)).
* Fix bug which leads to wrong merges assignment if table has partitions with a single part. [#14444](https://github.com/ClickHouse/ClickHouse/pull/14444) ([alesapin](https://github.com/alesapin)).
* Stop query execution if exception happened in `PipelineExecutor` itself. This could prevent rare possible query hung. [#14334](https://github.com/ClickHouse/ClickHouse/pull/14334) [#14402](https://github.com/ClickHouse/ClickHouse/pull/14402) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix crash during `ALTER` query for table which was created `AS table_function`. Fixes [#14212](https://github.com/ClickHouse/ClickHouse/issues/14212). [#14326](https://github.com/ClickHouse/ClickHouse/pull/14326) ([alesapin](https://github.com/alesapin)).
* Fix exception during ALTER LIVE VIEW query with REFRESH command. [#14320](https://github.com/ClickHouse/ClickHouse/pull/14320) ([Bharat Nallan](https://github.com/bharatnc)).
* Fix QueryPlan lifetime (for EXPLAIN PIPELINE graph=1) for queries with nested interpreter. [#14315](https://github.com/ClickHouse/ClickHouse/pull/14315) ([Azat Khuzhin](https://github.com/azat)).
* Better check for tuple size in SSD cache complex key external dictionaries. This fixes [#13981](https://github.com/ClickHouse/ClickHouse/issues/13981). [#14313](https://github.com/ClickHouse/ClickHouse/pull/14313) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Disallows `CODEC` on `ALIAS` column type. Fixes [#13911](https://github.com/ClickHouse/ClickHouse/issues/13911). [#14263](https://github.com/ClickHouse/ClickHouse/pull/14263) ([Bharat Nallan](https://github.com/bharatnc)).
* Fix GRANT ALL statement when executed on a non-global level. [#13987](https://github.com/ClickHouse/ClickHouse/pull/13987) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix arrayJoin() capturing in lambda (LOGICAL_ERROR). [#13792](https://github.com/ClickHouse/ClickHouse/pull/13792) ([Azat Khuzhin](https://github.com/azat)).
#### Improvement
* Allow using multi-volume storage configuration in storage Distributed. [#14839](https://github.com/ClickHouse/ClickHouse/pull/14839) ([Pavel Kovalenko](https://github.com/Jokser)).
* Disallow empty time_zone argument in `toStartOf*` type of functions. [#14509](https://github.com/ClickHouse/ClickHouse/pull/14509) ([Bharat Nallan](https://github.com/bharatnc)).
* MySQL handler returns `OK` for queries like `SET @@var = value`. Such statement is ignored. It is needed because some MySQL drivers send `SET @@` query for setup after handshake https://github.com/ClickHouse/ClickHouse/issues/9336#issuecomment-686222422 . [#14469](https://github.com/ClickHouse/ClickHouse/pull/14469) ([BohuTANG](https://github.com/BohuTANG)).
* Now TTLs will be applied during merge if they were not previously materialized. [#14438](https://github.com/ClickHouse/ClickHouse/pull/14438) ([alesapin](https://github.com/alesapin)).
* Creating sets for multiple `JOIN` and `IN` in parallel. It may slightly improve performance for queries with several different `IN subquery` expressions. [#14412](https://github.com/ClickHouse/ClickHouse/pull/14412) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Now obfuscator supports UUID type as proposed in [#13163](https://github.com/ClickHouse/ClickHouse/issues/13163). [#14409](https://github.com/ClickHouse/ClickHouse/pull/14409) ([dimarub2000](https://github.com/dimarub2000)).
* Added new setting system_events_show_zero_values as proposed in [#11384](https://github.com/ClickHouse/ClickHouse/issues/11384). [#14404](https://github.com/ClickHouse/ClickHouse/pull/14404) ([dimarub2000](https://github.com/dimarub2000)).
* Implicitly convert primary key to not null in MaterializeMySQL (Same as MySQL). Fixes [#14114](https://github.com/ClickHouse/ClickHouse/issues/14114). [#14397](https://github.com/ClickHouse/ClickHouse/pull/14397) ([Winter Zhang](https://github.com/zhang2014)).
* Replace wide integers from boost multiprecision with implementation from https://github.com/cerevra/int. [#14229](https://github.com/ClickHouse/ClickHouse/pull/14229) ([Artem Zuikov](https://github.com/4ertus2)).
* Add default compression codec for parts in `system.part_log` with name `default_compression_codec`. [#14116](https://github.com/ClickHouse/ClickHouse/pull/14116) ([alesapin](https://github.com/alesapin)).
* Improve the Kafka engine performance by providing independent thread for each consumer. Separate thread pool for streaming engines (like Kafka). [#13939](https://github.com/ClickHouse/ClickHouse/pull/13939) ([fastio](https://github.com/fastio)).
* Add precision argument for DateTime type. [#13761](https://github.com/ClickHouse/ClickHouse/pull/13761) ([Winter Zhang](https://github.com/zhang2014)).
* Added requirepass authorization for Redis external dictionary. [#13688](https://github.com/ClickHouse/ClickHouse/pull/13688) ([Ivan Torgashov](https://github.com/it1804)).
* Improvements in StorageRabbitMQ: Added connection and channels failure handling, proper commits, insert failures handling, better exchanges, queue durability and queue resume opportunity, new queue settings. Fixed tests. [#12761](https://github.com/ClickHouse/ClickHouse/pull/12761) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Support custom codecs in compact parts. [#12183](https://github.com/ClickHouse/ClickHouse/pull/12183) ([Anton Popov](https://github.com/CurtizJ)).
#### Performance Improvement
* Optimize queries with LIMIT/LIMIT BY/ORDER BY for distributed with GROUP BY sharding_key (under optimize_skip_unused_shards and optimize_distributed_group_by_sharding_key). [#10373](https://github.com/ClickHouse/ClickHouse/pull/10373) ([Azat Khuzhin](https://github.com/azat)).
#### Build/Testing/Packaging Improvement
* Lower binary size in debug build by removing debug info from `Functions`. This is needed only for one internal project in Yandex who is using very old linker. [#14549](https://github.com/ClickHouse/ClickHouse/pull/14549) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Prepare for build with clang 11. [#14455](https://github.com/ClickHouse/ClickHouse/pull/14455) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix the logic in backport script. In previous versions it was triggered for any labels of 100% red color. It was strange. [#14433](https://github.com/ClickHouse/ClickHouse/pull/14433) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Integration tests use default base config. All config changes are explicit with main_configs, user_configs and dictionaries parameters for instance. [#13647](https://github.com/ClickHouse/ClickHouse/pull/13647) ([Ilya Yatsishin](https://github.com/qoega)).
## ClickHouse release 20.8
### ClickHouse release v20.8.2.3-stable, 2020-09-08