### ClickHouse release v21.3.19.1-lts FIXME as compared to v21.3.18.4-lts

#### Performance Improvement
* Backported in [#31733](https://github.com/ClickHouse/ClickHouse/issues/31733): Improve performance of JSON and XML output formats. [#31673](https://github.com/ClickHouse/ClickHouse/pull/31673) ([Alexey Milovidov](https://github.com/alexey-milovidov)).

#### Bug Fix
* Backported in [#31577](https://github.com/ClickHouse/ClickHouse/issues/31577): Quota limit was not reached, but the limit was exceeded. This PR fixes [#31174](https://github.com/ClickHouse/ClickHouse/issues/31174). [#31337](https://github.com/ClickHouse/ClickHouse/pull/31337) ([sunny](https://github.com/sunny19930321)).
* Backported in [#32347](https://github.com/ClickHouse/ClickHouse/issues/32347): Fix bug when remove unneeded columns in subquery. If there is an aggregation function in query without group by, do not remove if it is unneeded. [#32289](https://github.com/ClickHouse/ClickHouse/pull/32289) ([dongyifeng](https://github.com/dyf6372)).

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

* Backported in [#30913](https://github.com/ClickHouse/ClickHouse/issues/30913): Fix `ORDER BY ... WITH FILL` with set `TO` and `FROM` and no rows in result set. [#30888](https://github.com/ClickHouse/ClickHouse/pull/30888) ([Anton Popov](https://github.com/CurtizJ)).

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

* Backported in [#30750](https://github.com/ClickHouse/ClickHouse/issues/30750): Functions for case-insensitive search in UTF8 strings like `positionCaseInsensitiveUTF8` and `countSubstringsCaseInsensitiveUTF8` might find substrings that actually does not match, it's fixed. [#30663](https://github.com/ClickHouse/ClickHouse/pull/30663) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#31038](https://github.com/ClickHouse/ClickHouse/issues/31038): Using `formatRow` function with not row formats led to segfault. Don't allow to use this function with such formats (because it doesn't make sense). [#31001](https://github.com/ClickHouse/ClickHouse/pull/31001) ([Kruglov Pavel](https://github.com/Avogar)).
* Backported in [#31519](https://github.com/ClickHouse/ClickHouse/issues/31519): Remove not like function into RPNElement. [#31169](https://github.com/ClickHouse/ClickHouse/pull/31169) ([sundyli](https://github.com/sundy-li)).
* Backported in [#31581](https://github.com/ClickHouse/ClickHouse/issues/31581): * Disable `partial_merge_join_left_table_buffer_bytes` before bug in this optimization is fixed. See [#31009](https://github.com/ClickHouse/ClickHouse/issues/31009)). * Remove redundant option `partial_merge_join_optimizations`. [#31528](https://github.com/ClickHouse/ClickHouse/pull/31528) ([Vladimir C](https://github.com/vdimir)).
* Backported in [#31792](https://github.com/ClickHouse/ClickHouse/issues/31792): Settings `input_format_allow_errors_num` and `input_format_allow_errors_ratio` did not work for parsing of domain types, such as `IPv4`, it's fixed. Fixes [#31686](https://github.com/ClickHouse/ClickHouse/issues/31686). [#31697](https://github.com/ClickHouse/ClickHouse/pull/31697) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#31816](https://github.com/ClickHouse/ClickHouse/issues/31816): Fix race in JSONEachRowWithProgress output format when data and lines with progress are mixed in output. [#31736](https://github.com/ClickHouse/ClickHouse/pull/31736) ([Kruglov Pavel](https://github.com/Avogar)).
* Backported in [#31758](https://github.com/ClickHouse/ClickHouse/issues/31758): Fix usage of `Buffer` table engine with type `Map`. Fixes [#30546](https://github.com/ClickHouse/ClickHouse/issues/30546). [#31742](https://github.com/ClickHouse/ClickHouse/pull/31742) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#32153](https://github.com/ClickHouse/ClickHouse/issues/32153): Fix crash when function `dictGet` with type is used for dictionary attribute when type is `Nullable`. Fixes [#30980](https://github.com/ClickHouse/ClickHouse/issues/30980). [#31800](https://github.com/ClickHouse/ClickHouse/pull/31800) ([Maksim Kita](https://github.com/kitaisreal)).
* Backported in [#31894](https://github.com/ClickHouse/ClickHouse/issues/31894): Fix possible assertion `../src/IO/ReadBuffer.h:58: bool DB::ReadBuffer::next(): Assertion '!hasPendingData()' failed.` in TSKV format. [#31804](https://github.com/ClickHouse/ClickHouse/pull/31804) ([Kruglov Pavel](https://github.com/Avogar)).
* Backported in [#32214](https://github.com/ClickHouse/ClickHouse/issues/32214): Number of active replicas might be determined incorrectly when inserting with quorum if setting `replicated_can_become_leader` is disabled on some replicas. It's fixed. [#32157](https://github.com/ClickHouse/ClickHouse/pull/32157) ([Alexander Tokmakov](https://github.com/tavplubix)).