ClickHouse/docs/changelogs/v20.5.5.74-stable.md

### ClickHouse release v20.5.5.74-stable FIXME as compared to v20.5.4.40-stable

#### Improvement
* Backported in [#13920](https://github.com/ClickHouse/ClickHouse/issues/13920): Fix data race in `lgamma` function. This race was caught only in `tsan`, no side effects a really happened. [#13842](https://github.com/ClickHouse/ClickHouse/pull/13842) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).

#### Bug Fix
* Backported in [#13300](https://github.com/ClickHouse/ClickHouse/issues/13300): The function `groupArrayMoving*` was not working for distributed queries. It's result was calculated within incorrect data type (without promotion to the largest type). The function `groupArrayMovingAvg` was returning integer number that was inconsistent with the `avg` function. This fixes [#12568](https://github.com/ClickHouse/ClickHouse/issues/12568). [#12622](https://github.com/ClickHouse/ClickHouse/pull/12622) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#13030](https://github.com/ClickHouse/ClickHouse/issues/13030): CREATE USER IF NOT EXISTS now doesn't throw exception if the user exists. This fixes [#12507](https://github.com/ClickHouse/ClickHouse/issues/12507). [#12646](https://github.com/ClickHouse/ClickHouse/pull/12646) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#12996](https://github.com/ClickHouse/ClickHouse/issues/12996): Fix optimization `optimize_move_functions_out_of_any=1` in case of `any(func(<lambda>))`. [#12664](https://github.com/ClickHouse/ClickHouse/pull/12664) ([Artem Zuikov](https://github.com/4ertus2)).
* Backported in [#13092](https://github.com/ClickHouse/ClickHouse/issues/13092): Fix CAST(Nullable(String), Enum()). [#12745](https://github.com/ClickHouse/ClickHouse/pull/12745) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#12984](https://github.com/ClickHouse/ClickHouse/issues/12984): Fix columns duplication for range hashed dictionary created from DDL query. This fixes [#10605](https://github.com/ClickHouse/ClickHouse/issues/10605). [#12857](https://github.com/ClickHouse/ClickHouse/pull/12857) ([alesapin](https://github.com/alesapin)).
* Backported in [#13561](https://github.com/ClickHouse/ClickHouse/issues/13561): Fix access to redis dictionary after connection was dropped once. It may happen with `cache` and `direct` dictionary layouts. [#13082](https://github.com/ClickHouse/ClickHouse/pull/13082) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#13508](https://github.com/ClickHouse/ClickHouse/issues/13508): Fix parsing row policies from users.xml when names of databases or tables contain dots. This fixes [#5779](https://github.com/ClickHouse/ClickHouse/issues/5779), [#12527](https://github.com/ClickHouse/ClickHouse/issues/12527). [#13199](https://github.com/ClickHouse/ClickHouse/pull/13199) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#13358](https://github.com/ClickHouse/ClickHouse/issues/13358): AvroConfluent: Skip Kafka tombstone records AvroConfluent: Support skipping broken records ... [#13203](https://github.com/ClickHouse/ClickHouse/pull/13203) ([Andrew Onyshchuk](https://github.com/oandrew)).
* Backported in [#13223](https://github.com/ClickHouse/ClickHouse/issues/13223): Fix DateTime64 conversion functions with constant argument. [#13205](https://github.com/ClickHouse/ClickHouse/pull/13205) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#13244](https://github.com/ClickHouse/ClickHouse/issues/13244): Fix assert in `arrayElement` function in case of array elements are Nullable and array subscript is also Nullable. This fixes [#12172](https://github.com/ClickHouse/ClickHouse/issues/12172). [#13224](https://github.com/ClickHouse/ClickHouse/pull/13224) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#13268](https://github.com/ClickHouse/ClickHouse/issues/13268): Fix function if with nullable constexpr as cond that is not literal NULL. Fixes [#12463](https://github.com/ClickHouse/ClickHouse/issues/12463). [#13226](https://github.com/ClickHouse/ClickHouse/pull/13226) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#13351](https://github.com/ClickHouse/ClickHouse/issues/13351): Return passed number for numbers with MSB set in roundUpToPowerOfTwoOrZero(). [#13234](https://github.com/ClickHouse/ClickHouse/pull/13234) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#13299](https://github.com/ClickHouse/ClickHouse/issues/13299): Fix potentially low performance and slightly incorrect result for `uniqExact`, `topK`, `sumDistinct` and similar aggregate functions called on Float types with NaN values. It also triggered assert in debug build. This fixes [#12491](https://github.com/ClickHouse/ClickHouse/issues/12491). [#13254](https://github.com/ClickHouse/ClickHouse/pull/13254) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#13315](https://github.com/ClickHouse/ClickHouse/issues/13315): The server may crash if user passed specifically crafted arguments to the function `h3ToChildren`. This fixes [#13275](https://github.com/ClickHouse/ClickHouse/issues/13275). [#13277](https://github.com/ClickHouse/ClickHouse/pull/13277) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#13328](https://github.com/ClickHouse/ClickHouse/issues/13328): Fix possible error `Totals having transform was already added to pipeline` in case of a query from delayed replica. [#13290](https://github.com/ClickHouse/ClickHouse/pull/13290) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#13609](https://github.com/ClickHouse/ClickHouse/issues/13609): Fix missing or excessive headers in `TSV/CSVWithNames` formats. This fixes [#12504](https://github.com/ClickHouse/ClickHouse/issues/12504). [#13343](https://github.com/ClickHouse/ClickHouse/pull/13343) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#13482](https://github.com/ClickHouse/ClickHouse/issues/13482): Fix queries with constant columns and `ORDER BY` prefix of primary key. [#13396](https://github.com/ClickHouse/ClickHouse/pull/13396) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#13488](https://github.com/ClickHouse/ClickHouse/issues/13488): Fix empty output for `Arrow` and `Parquet` formats in case if query return zero rows. It was done because empty output is not valid for this formats. [#13399](https://github.com/ClickHouse/ClickHouse/pull/13399) ([hcz](https://github.com/hczhcz)).
* Backported in [#13569](https://github.com/ClickHouse/ClickHouse/issues/13569): Fix possible race in `StorageMemory`. https://clickhouse-test-reports.s3.yandex.net/0/9cac8a7244063d2092ad25d45502611e18d3749c/stress_test_(thread)/stderr.log Have no idea how to write a test. [#13416](https://github.com/ClickHouse/ClickHouse/pull/13416) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#13442](https://github.com/ClickHouse/ClickHouse/issues/13442): Fix `aggregate function any(x) is found inside another aggregate function in query` error with `SET optimize_move_functions_out_of_any = 1` and aliases inside `any()`. [#13419](https://github.com/ClickHouse/ClickHouse/pull/13419) ([Artem Zuikov](https://github.com/4ertus2)).
* Backported in [#13486](https://github.com/ClickHouse/ClickHouse/issues/13486): Fix invalid return type for comparison of tuples with `NULL` elements. Fixes [#12461](https://github.com/ClickHouse/ClickHouse/issues/12461). [#13420](https://github.com/ClickHouse/ClickHouse/pull/13420) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#13463](https://github.com/ClickHouse/ClickHouse/issues/13463): Fix error in `parseDateTimeBestEffort` function when unix timestamp was passed as an argument. This fixes [#13362](https://github.com/ClickHouse/ClickHouse/issues/13362). [#13441](https://github.com/ClickHouse/ClickHouse/pull/13441) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#13663](https://github.com/ClickHouse/ClickHouse/issues/13663): Concurrent `ALTER ... REPLACE/MOVE PARTITION ...` queries might cause deadlock. It's fixed. [#13626](https://github.com/ClickHouse/ClickHouse/pull/13626) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#13717](https://github.com/ClickHouse/ClickHouse/issues/13717): Fix crash in JOIN with StorageMerge and `set enable_optimize_predicate_expression=1`. [#13679](https://github.com/ClickHouse/ClickHouse/pull/13679) ([Artem Zuikov](https://github.com/4ertus2)).
* Backported in [#13701](https://github.com/ClickHouse/ClickHouse/issues/13701): Do not optimize any(arrayJoin()) -> arrayJoin() under optimize_move_functions_out_of_any. [#13681](https://github.com/ClickHouse/ClickHouse/pull/13681) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#13732](https://github.com/ClickHouse/ClickHouse/issues/13732): Fix incorrect message in `clickhouse-server.init` while checking user and group. [#13711](https://github.com/ClickHouse/ClickHouse/pull/13711) ([ylchou](https://github.com/ylchou)).
* Backported in [#13903](https://github.com/ClickHouse/ClickHouse/issues/13903): Fix incorrect sorting for `FixedString` columns. Fixes [#13182](https://github.com/ClickHouse/ClickHouse/issues/13182). [#13887](https://github.com/ClickHouse/ClickHouse/pull/13887) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).