ClickHouse/docs/changelogs/v21.7.9.7-stable.md

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sidebar_label: 2022
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# 2022 Changelog

### ClickHouse release v21.7.9.7-stable FIXME as compared to v21.7.8.58-stable

#### Improvement
* Backported in [#27892](https://github.com/ClickHouse/ClickHouse/issues/27892): Allow symlinks for library dictionaty path. [#27815](https://github.com/ClickHouse/ClickHouse/pull/27815) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Backported in [#28155](https://github.com/ClickHouse/ClickHouse/issues/28155): Use Multipart copy upload for large S3 objects. [#27858](https://github.com/ClickHouse/ClickHouse/pull/27858) ([ianton-ru](https://github.com/ianton-ru)).

#### Bug Fix
* Backported in [#27976](https://github.com/ClickHouse/ClickHouse/issues/27976): Bugfix for windowFunnel's "strict" mode. This fixes [#27469](https://github.com/ClickHouse/ClickHouse/issues/27469). [#27563](https://github.com/ClickHouse/ClickHouse/pull/27563) ([achimbab](https://github.com/achimbab)).
* Backported in [#27780](https://github.com/ClickHouse/ClickHouse/issues/27780): Fix column filtering with union distinct in subquery. Closes [#27578](https://github.com/ClickHouse/ClickHouse/issues/27578). [#27689](https://github.com/ClickHouse/ClickHouse/pull/27689) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Backported in [#27866](https://github.com/ClickHouse/ClickHouse/issues/27866): Prevent crashes for some formats when NULL (tombstone) message was coming from Kafka. Closes [#19255](https://github.com/ClickHouse/ClickHouse/issues/19255). [#27794](https://github.com/ClickHouse/ClickHouse/pull/27794) ([filimonov](https://github.com/filimonov)).
* Backported in [#28347](https://github.com/ClickHouse/ClickHouse/issues/28347): Fix a rare bug in `DROP PART` which can lead to the error `Unexpected merged part intersects drop range`. [#27807](https://github.com/ClickHouse/ClickHouse/pull/27807) ([alesapin](https://github.com/alesapin)).
* Backported in [#27955](https://github.com/ClickHouse/ClickHouse/issues/27955): Fix selecting with extremes from a column of the type `LowCardinality(UUID)`. [#27918](https://github.com/ClickHouse/ClickHouse/pull/27918) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#27951](https://github.com/ClickHouse/ClickHouse/issues/27951): Check cluster name before creating Distributed table, do not allow to create a table with incorrect cluster name. Fixes [#27832](https://github.com/ClickHouse/ClickHouse/issues/27832). [#27927](https://github.com/ClickHouse/ClickHouse/pull/27927) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#28208](https://github.com/ClickHouse/ClickHouse/issues/28208): Fix cases, when read buffer fails with 'attempt to read after end of file'. Closes [#26149](https://github.com/ClickHouse/ClickHouse/issues/26149). [#28150](https://github.com/ClickHouse/ClickHouse/pull/28150) ([Filatenkov Artur](https://github.com/FArthur-cmd)).

#### Build/Testing/Packaging Improvement
* Backported in [#28032](https://github.com/ClickHouse/ClickHouse/issues/28032): Temporarily switched ubuntu apt repository to mirror ru.archive.ubuntu.com as default one(archive.ubuntu.com) is not responding from our CI. [#28016](https://github.com/ClickHouse/ClickHouse/pull/28016) ([Ilya Yatsishin](https://github.com/qoega)).

#### Bug Fix (user-visible misbehaviour in official stable release)

* Backported in [#28116](https://github.com/ClickHouse/ClickHouse/issues/28116): Fix extremely rare segfaults on shutdown due to incorrect order of context/config reloader shutdown. [#28088](https://github.com/ClickHouse/ClickHouse/pull/28088) ([nvartolomei](https://github.com/nvartolomei)).
* Backported in [#28183](https://github.com/ClickHouse/ClickHouse/issues/28183): Fixed possible excessive number of conditions moved from `WHERE` to `PREWHERE` (optimization controlled by settings `optimize_move_to_prewhere`). [#28139](https://github.com/ClickHouse/ClickHouse/pull/28139) ([lthaooo](https://github.com/lthaooo)).
* Backported in [#28255](https://github.com/ClickHouse/ClickHouse/issues/28255): Fix incorrect behavior in `clickhouse-keeper` when list watches (`getChildren`) triggered with `set` requests for children. [#28190](https://github.com/ClickHouse/ClickHouse/pull/28190) ([alesapin](https://github.com/alesapin)).
* Backported in [#28265](https://github.com/ClickHouse/ClickHouse/issues/28265): Fix possible read of uninitialized memory for queries with `Nullable(LowCardinality)` type and extremes. Fixes [#28165](https://github.com/ClickHouse/ClickHouse/issues/28165). [#28205](https://github.com/ClickHouse/ClickHouse/pull/28205) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#28288](https://github.com/ClickHouse/ClickHouse/issues/28288): Fix reading of custom TLD w/o new line at EOF. [#28213](https://github.com/ClickHouse/ClickHouse/pull/28213) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#28295](https://github.com/ClickHouse/ClickHouse/issues/28295): Fix inconsistent result in queries with `ORDER BY` and `Merge` tables with enabled setting `optimize_read_in_order`. [#28266](https://github.com/ClickHouse/ClickHouse/pull/28266) ([Anton Popov](https://github.com/CurtizJ)).

#### NOT FOR CHANGELOG / INSIGNIFICANT

* Fix prometheus metric name [#26140](https://github.com/ClickHouse/ClickHouse/pull/26140) ([Vladimir C](https://github.com/vdimir)).
* Fix flaky test [#27383](https://github.com/ClickHouse/ClickHouse/pull/27383) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Fix throw without exception in MySQL source. [#28027](https://github.com/ClickHouse/ClickHouse/pull/28027) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix race between REPLACE PARTITION and MOVE PARTITION [#28035](https://github.com/ClickHouse/ClickHouse/pull/28035) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Follow-up to [#28016](https://github.com/ClickHouse/ClickHouse/issues/28016) [#28036](https://github.com/ClickHouse/ClickHouse/pull/28036) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Set version of tzlocal to 2.1 [#28063](https://github.com/ClickHouse/ClickHouse/pull/28063) ([Vitaly Baranov](https://github.com/vitlibar)).
* ODBC connection holder fix dangling reference [#28298](https://github.com/ClickHouse/ClickHouse/pull/28298) ([Maksim Kita](https://github.com/kitaisreal)).
* Another try to fix BackgroundPoolTask decrement. [#28353](https://github.com/ClickHouse/ClickHouse/pull/28353) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* More accurate check that zk root exists. [#28412](https://github.com/ClickHouse/ClickHouse/pull/28412) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).