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sidebar_position: 1
sidebar_label: 2022
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# 2022 Changelog

### ClickHouse release v21.5.3.1-prestable FIXME as compared to v21.5.2.25-prestable

#### Bug Fix
* Backported in [#23818](https://github.com/ClickHouse/ClickHouse/issues/23818): Fix crash when `PREWHERE` and row policy filter are both in effect with empty result. [#23763](https://github.com/ClickHouse/ClickHouse/pull/23763) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#23798](https://github.com/ClickHouse/ClickHouse/issues/23798): Fixed remote JDBC bridge timeout connection issue. Closes [#9609](https://github.com/ClickHouse/ClickHouse/issues/9609). [#23771](https://github.com/ClickHouse/ClickHouse/pull/23771) ([Maksim Kita](https://github.com/kitaisreal)).
* Backported in [#23815](https://github.com/ClickHouse/ClickHouse/issues/23815): Fix `CLEAR COLUMN` does not work when it is referenced by materialized view. Close [#23764](https://github.com/ClickHouse/ClickHouse/issues/23764). [#23781](https://github.com/ClickHouse/ClickHouse/pull/23781) ([flynn](https://github.com/ucasfl)).
* Backported in [#23832](https://github.com/ClickHouse/ClickHouse/issues/23832): Fix error `Can't initialize pipeline with empty pipe` for queries with `GLOBAL IN/JOIN` and `use_hedged_requests`. Fixes [#23431](https://github.com/ClickHouse/ClickHouse/issues/23431). [#23805](https://github.com/ClickHouse/ClickHouse/pull/23805) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#23927](https://github.com/ClickHouse/ClickHouse/issues/23927): HashedDictionary complex key update field initial load fix. Closes [#23800](https://github.com/ClickHouse/ClickHouse/issues/23800). [#23824](https://github.com/ClickHouse/ClickHouse/pull/23824) ([Maksim Kita](https://github.com/kitaisreal)).

#### NOT FOR CHANGELOG / INSIGNIFICANT

* Flat, Hashed dictionary include update field bytes into bytes_allocated [#23825](https://github.com/ClickHouse/ClickHouse/pull/23825) ([Maksim Kita](https://github.com/kitaisreal)).