ClickHouse/docs/changelogs/v21.6.2.7-prestable.md

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# 2022 Changelog

### ClickHouse release v21.6.2.7-prestable FIXME as compared to v21.6.1.6891-prestable

#### Bug Fix
* Backported in [#24567](https://github.com/ClickHouse/ClickHouse/issues/24567): Use old modulo function version when used in partition key. Closes [#23508](https://github.com/ClickHouse/ClickHouse/issues/23508). [#24157](https://github.com/ClickHouse/ClickHouse/pull/24157) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Backported in [#24367](https://github.com/ClickHouse/ClickHouse/issues/24367): Set `max_threads = 1` to fix mutation fail of StorageMemory. Closes [#24274](https://github.com/ClickHouse/ClickHouse/issues/24274). [#24275](https://github.com/ClickHouse/ClickHouse/pull/24275) ([flynn](https://github.com/ucasfl)).
* Backported in [#24383](https://github.com/ClickHouse/ClickHouse/issues/24383): Allow empty HTTP headers. Fixes [#23901](https://github.com/ClickHouse/ClickHouse/issues/23901). [#24285](https://github.com/ClickHouse/ClickHouse/pull/24285) ([Ivan](https://github.com/abyss7)).
* Backported in [#24365](https://github.com/ClickHouse/ClickHouse/issues/24365): Fixed a bug in moving Materialized View from Ordinary to Atomic database (`RENAME TABLE` query). Now inner table is moved to new database together with Materialized View. Fixes [#23926](https://github.com/ClickHouse/ClickHouse/issues/23926). [#24309](https://github.com/ClickHouse/ClickHouse/pull/24309) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#24510](https://github.com/ClickHouse/ClickHouse/issues/24510): Fix drop partition with intersect fake parts. In rare cases there might be parts with mutation version greater than current block number. [#24321](https://github.com/ClickHouse/ClickHouse/pull/24321) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#24542](https://github.com/ClickHouse/ClickHouse/issues/24542): Fix incorrect monotonicity of toWeek function. This fixes [#24422](https://github.com/ClickHouse/ClickHouse/issues/24422) . This bug was introduced in https://github.com/ClickHouse/ClickHouse/pull/5212 , and was exposed later by smarter partition pruner. [#24446](https://github.com/ClickHouse/ClickHouse/pull/24446) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#24556](https://github.com/ClickHouse/ClickHouse/issues/24556): Fixed the behavior when query `SYSTEM RESTART REPLICA` or `SYSTEM SYNC REPLICA` is being processed infinitely. This was detected on server with extremely little amount of RAM. [#24457](https://github.com/ClickHouse/ClickHouse/pull/24457) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Backported in [#24597](https://github.com/ClickHouse/ClickHouse/issues/24597): Fix usage of tuples in `CREATE .. AS SELECT` queries. [#24464](https://github.com/ClickHouse/ClickHouse/pull/24464) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#24600](https://github.com/ClickHouse/ClickHouse/issues/24600): Enable reading of subcolumns for distributed tables. [#24472](https://github.com/ClickHouse/ClickHouse/pull/24472) ([Anton Popov](https://github.com/CurtizJ)).

#### NOT FOR CHANGELOG / INSIGNIFICANT

* Use memmove in PODArray::insert to handle memory overlapping. [#24271](https://github.com/ClickHouse/ClickHouse/pull/24271) ([Fu Zhe](https://github.com/fuzhe1989)).
* Fix cli argument in clickhouse-server.init [#24449](https://github.com/ClickHouse/ClickHouse/pull/24449) ([Vladimir C](https://github.com/vdimir)).
* Fix several cases in cast operator [#24471](https://github.com/ClickHouse/ClickHouse/pull/24471) ([Anton Popov](https://github.com/CurtizJ)).