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sidebar_label: 2022
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# 2022 Changelog

### ClickHouse release v21.2.10.48-stable FIXME as compared to v21.2.9.41-stable

#### Improvement
* Backported in [#23015](https://github.com/ClickHouse/ClickHouse/issues/23015): Set `background_fetches_pool_size` to 8 that is better for production usage with frequent small insertions or slow ZooKeeper cluster. [#22945](https://github.com/ClickHouse/ClickHouse/pull/22945) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#23080](https://github.com/ClickHouse/ClickHouse/issues/23080): Raised the threshold on max number of matches in result of the function `extractAllGroupsHorizontal`. [#23036](https://github.com/ClickHouse/ClickHouse/pull/23036) ([Vasily Nemkov](https://github.com/Enmk)).

#### Bug Fix
* Backported in [#23155](https://github.com/ClickHouse/ClickHouse/issues/23155): Fixed a bug with unlimited wait for auxiliary AWS requests. [#22594](https://github.com/ClickHouse/ClickHouse/pull/22594) ([Vladimir Chebotarev](https://github.com/excitoon)).
* Backported in [#23032](https://github.com/ClickHouse/ClickHouse/issues/23032): Fix error `Cannot find column in ActionsDAG result` which may happen if subquery uses `untuple`. Fixes [#22290](https://github.com/ClickHouse/ClickHouse/issues/22290). [#22991](https://github.com/ClickHouse/ClickHouse/pull/22991) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#23171](https://github.com/ClickHouse/ClickHouse/issues/23171): Some values were formatted with alignment in center in table cells in `Markdown` format. Not anymore. [#23096](https://github.com/ClickHouse/ClickHouse/pull/23096) ([Alexey Milovidov](https://github.com/alexey-milovidov)).

#### NOT FOR CHANGELOG / INSIGNIFICANT

* LibraryDictionarySource fix possible leak [#21686](https://github.com/ClickHouse/ClickHouse/pull/21686) ([Maksim Kita](https://github.com/kitaisreal)).
