ClickHouse/docs/changelogs/v21.7.10.4-stable.md

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# 2022 Changelog

### ClickHouse release v21.7.10.4-stable FIXME as compared to v21.7.9.7-stable

#### Improvement
* Backported in [#28898](https://github.com/ClickHouse/ClickHouse/issues/28898): Use real tmp file instead of predefined "rows_sources" for vertical merges. This avoids generating garbage directories in tmp disks. [#28299](https://github.com/ClickHouse/ClickHouse/pull/28299) ([Amos Bird](https://github.com/amosbird)).

#### Bug Fix
* Backported in [#27925](https://github.com/ClickHouse/ClickHouse/issues/27925): Fix PostgreSQL-style cast (`::` operator) with negative numbers. [#27876](https://github.com/ClickHouse/ClickHouse/pull/27876) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#28752](https://github.com/ClickHouse/ClickHouse/issues/28752): Fix transformation of disjunctions chain to `IN` (controlled by settings `optimize_min_equality_disjunction_chain_length`) in distributed queries with settings `legacy_column_name_of_tuple_literal = 0`. [#28658](https://github.com/ClickHouse/ClickHouse/pull/28658) ([Anton Popov](https://github.com/CurtizJ)).

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

* Backported in [#28509](https://github.com/ClickHouse/ClickHouse/issues/28509): Fixed possible ZooKeeper watches leak on background processing of distributed DDL queue. Closes [#26036](https://github.com/ClickHouse/ClickHouse/issues/26036). [#28446](https://github.com/ClickHouse/ClickHouse/pull/28446) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#28570](https://github.com/ClickHouse/ClickHouse/issues/28570): 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 [#28598](https://github.com/ClickHouse/ClickHouse/issues/28598): Fix `There is no subcolumn` error, while select from tables, which have `Nested` columns and scalar columns with dot in name and the same prefix as `Nested` (e.g. `n.id UInt32, n.arr1 Array(UInt64), n.arr2 Array(UInt64)`). [#28531](https://github.com/ClickHouse/ClickHouse/pull/28531) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#28742](https://github.com/ClickHouse/ClickHouse/issues/28742): Fix the coredump in the creation of distributed tables, when the parameters passed in are wrong. [#28686](https://github.com/ClickHouse/ClickHouse/pull/28686) ([Zhiyong Wang](https://github.com/ljcui)).
* Backported in [#28788](https://github.com/ClickHouse/ClickHouse/issues/28788): 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 [#28947](https://github.com/ClickHouse/ClickHouse/issues/28947): Fix reading of subcolumns from compact parts. [#28873](https://github.com/ClickHouse/ClickHouse/pull/28873) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#28931](https://github.com/ClickHouse/ClickHouse/issues/28931): 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)).

#### NOT FOR CHANGELOG / INSIGNIFICANT

* Add more checks for LC in native protocol. [#27827](https://github.com/ClickHouse/ClickHouse/pull/27827) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* CHJIT custom memory manager [#28236](https://github.com/ClickHouse/ClickHouse/pull/28236) ([Maksim Kita](https://github.com/kitaisreal)).
* Function dictGet default implementation for nulls [#28530](https://github.com/ClickHouse/ClickHouse/pull/28530) ([Maksim Kita](https://github.com/kitaisreal)).
* Fix usage of nested columns with non-array columns with the same prefix [2] [#28762](https://github.com/ClickHouse/ClickHouse/pull/28762) ([Anton Popov](https://github.com/CurtizJ)).
* Lower compiled_expression_cache_size to 128MB [#28816](https://github.com/ClickHouse/ClickHouse/pull/28816) ([Maksim Kita](https://github.com/kitaisreal)).