ClickHouse/docs/changelogs/v21.3.17.2-lts.md

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# 2022 Changelog

### ClickHouse release v21.3.17.2-lts FIXME as compared to v21.3.16.5-lts

#### Bug Fix
* Backported in [#28647](https://github.com/ClickHouse/ClickHouse/issues/28647): 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)).

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

* Backported in [#28569](https://github.com/ClickHouse/ClickHouse/issues/28569): Fix bug which can lead to error `Existing table metadata in ZooKeeper differs in sorting key expression.` after alter of `ReplicatedVersionedCollapsingMergeTree`. Fixes [#28515](https://github.com/ClickHouse/ClickHouse/issues/28515). [#28528](https://github.com/ClickHouse/ClickHouse/pull/28528) ([alesapin](https://github.com/alesapin)).
* Backported in [#28857](https://github.com/ClickHouse/ClickHouse/issues/28857): Fix benign race condition in ReplicatedMergeTreeQueue. Shouldn't be visible for user, but can lead to subtle bugs. [#28734](https://github.com/ClickHouse/ClickHouse/pull/28734) ([alesapin](https://github.com/alesapin)).
* Backported in [#28995](https://github.com/ClickHouse/ClickHouse/issues/28995): Fix reading of subcolumns from compact parts. [#28873](https://github.com/ClickHouse/ClickHouse/pull/28873) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#28929](https://github.com/ClickHouse/ClickHouse/issues/28929): Fix higher-order array functions (`SIGSEGV` for `arrayCompact`/`ILLEGAL_COLUMN` for `arrayDifference`/`arrayCumSumNonNegative`) with consts. [#28904](https://github.com/ClickHouse/ClickHouse/pull/28904) ([Azat Khuzhin](https://github.com/azat)).