### ClickHouse release v21.6.5.37-stable FIXME as compared to v21.6.4.26-stable
#### Improvement
* Backported in [#25221](https://github.com/ClickHouse/ClickHouse/issues/25221): Here will be listed all the bugs that I am gonna to fix in this PR. [#23518](https://github.com/ClickHouse/ClickHouse/pull/23518) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
#### Bug Fix
* Backported in [#25480](https://github.com/ClickHouse/ClickHouse/issues/25480): Fix "Missing columns" exception when joining Distributed Materialized View. [#24870](https://github.com/ClickHouse/ClickHouse/pull/24870) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#25366](https://github.com/ClickHouse/ClickHouse/issues/25366): Fix serialization of splitted nested messages in Protobuf format. This PR fixes [#24647](https://github.com/ClickHouse/ClickHouse/issues/24647). [#25000](https://github.com/ClickHouse/ClickHouse/pull/25000) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#25102](https://github.com/ClickHouse/ClickHouse/issues/25102): Distinguish KILL MUTATION for different tables (fixes unexpected `Cancelled mutating parts` error). [#25025](https://github.com/ClickHouse/ClickHouse/pull/25025) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#25213](https://github.com/ClickHouse/ClickHouse/issues/25213): Fixed an error which occurred while inserting a subset of columns using CSVWithNames format. Fixes [#25129](https://github.com/ClickHouse/ClickHouse/issues/25129). [#25169](https://github.com/ClickHouse/ClickHouse/pull/25169) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Backported in [#25352](https://github.com/ClickHouse/ClickHouse/issues/25352): Fix TOCTOU error in installation script. [#25277](https://github.com/ClickHouse/ClickHouse/pull/25277) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#25385](https://github.com/ClickHouse/ClickHouse/issues/25385): Fix incorrect behaviour and UBSan report in big integers. In previous versions `CAST(1e19 AS UInt128)` returned zero. [#25279](https://github.com/ClickHouse/ClickHouse/pull/25279) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#25470](https://github.com/ClickHouse/ClickHouse/issues/25470): Fix joinGetOrNull with not-nullable columns. This fixes [#24261](https://github.com/ClickHouse/ClickHouse/issues/24261). [#25288](https://github.com/ClickHouse/ClickHouse/pull/25288) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#25360](https://github.com/ClickHouse/ClickHouse/issues/25360): Fix error `Bad cast from type DB::ColumnLowCardinality to DB::ColumnVector<char8_t>` for queries where `LowCardinality` argument was used for IN (this bug appeared in 21.6). Fixes [#25187](https://github.com/ClickHouse/ClickHouse/issues/25187). [#25290](https://github.com/ClickHouse/ClickHouse/pull/25290) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#25356](https://github.com/ClickHouse/ClickHouse/issues/25356): Fix Logical Error Cannot sum Array/Tuple in min/maxMap. [#25298](https://github.com/ClickHouse/ClickHouse/pull/25298) ([Kruglov Pavel](https://github.com/Avogar)).
* Backported in [#25436](https://github.com/ClickHouse/ClickHouse/issues/25436): Support `SimpleAggregateFunction(LowCardinality)` for `SummingMergeTree`. Fixes [#25134](https://github.com/ClickHouse/ClickHouse/issues/25134). [#25300](https://github.com/ClickHouse/ClickHouse/pull/25300) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#25363](https://github.com/ClickHouse/ClickHouse/issues/25363): On ZooKeeper connection loss `ReplicatedMergeTree` table might wait for background operations to complete before trying to reconnect. It's fixed, now background operations are stopped forcefully. [#25306](https://github.com/ClickHouse/ClickHouse/pull/25306) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#25388](https://github.com/ClickHouse/ClickHouse/issues/25388): Fix the possibility of non-deterministic behaviour of the `quantileDeterministic` function and similar. This closes [#20480](https://github.com/ClickHouse/ClickHouse/issues/20480). [#25313](https://github.com/ClickHouse/ClickHouse/pull/25313) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#25448](https://github.com/ClickHouse/ClickHouse/issues/25448): Fix lost `WHERE` condition in expression-push-down optimization of query plan (setting `query_plan_filter_push_down = 1` by default). Fixes [#25368](https://github.com/ClickHouse/ClickHouse/issues/25368). [#25370](https://github.com/ClickHouse/ClickHouse/pull/25370) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#25407](https://github.com/ClickHouse/ClickHouse/issues/25407): Fix `REPLACE` column transformer when used in DDL by correctly quoting the formated query. This fixes [#23925](https://github.com/ClickHouse/ClickHouse/issues/23925). [#25391](https://github.com/ClickHouse/ClickHouse/pull/25391) ([Amos Bird](https://github.com/amosbird)).
