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ClickHouse/docs/changelogs/v21.9.2.17-stable.md

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---
sidebar_position: 1
sidebar_label: 2022
---
# 2022 Changelog
### ClickHouse release v21.9.2.17-stable FIXME as compared to v21.9.1.8000-prestable
#### Improvement
* Backported in [#27894](https://github.com/ClickHouse/ClickHouse/issues/27894): Allow symlinks for library dictionaty path. [#27815](https://github.com/ClickHouse/ClickHouse/pull/27815) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Backported in [#28153](https://github.com/ClickHouse/ClickHouse/issues/28153): Use Multipart copy upload for large S3 objects. [#27858](https://github.com/ClickHouse/ClickHouse/pull/27858) ([ianton-ru](https://github.com/ianton-ru)).
* Backported in [#28643](https://github.com/ClickHouse/ClickHouse/issues/28643): Fix strange sessions expiration logic in Keeper. Probably it should help in CI: https://clickhouse-test-reports.s3.yandex.net/0/6bd9b82141c98dcd7796fd9d08326831095ba519/stress_test_(debug).html#fail1. [#28519](https://github.com/ClickHouse/ClickHouse/pull/28519) ([alesapin](https://github.com/alesapin)).
#### Bug Fix
* Backported in [#27981](https://github.com/ClickHouse/ClickHouse/issues/27981): Bugfix for windowFunnel's "strict" mode. This fixes [#27469](https://github.com/ClickHouse/ClickHouse/issues/27469). [#27563](https://github.com/ClickHouse/ClickHouse/pull/27563) ([achimbab](https://github.com/achimbab)).
* Backported in [#27922](https://github.com/ClickHouse/ClickHouse/issues/27922): After https://github.com/ClickHouse/ClickHouse/pull/26864. Fix shutdown of `NamedSessionStorage`: session contexts stored in `NamedSessionStorage` are now destroyed before destroying the global context. [#27875](https://github.com/ClickHouse/ClickHouse/pull/27875) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#27926](https://github.com/ClickHouse/ClickHouse/issues/27926): Fix PostgreSQL-style cast (`::` operator) with negative numbers. [#27876](https://github.com/ClickHouse/ClickHouse/pull/27876) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#27959](https://github.com/ClickHouse/ClickHouse/issues/27959): Fix selecting with extremes from a column of the type `LowCardinality(UUID)`. [#27918](https://github.com/ClickHouse/ClickHouse/pull/27918) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#27954](https://github.com/ClickHouse/ClickHouse/issues/27954): Check cluster name before creating Distributed table, do not allow to create a table with incorrect cluster name. Fixes [#27832](https://github.com/ClickHouse/ClickHouse/issues/27832). [#27927](https://github.com/ClickHouse/ClickHouse/pull/27927) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#28000](https://github.com/ClickHouse/ClickHouse/issues/28000): Fix checking access grants when executing GRANT WITH REPLACE statement with ON CLUSTER clause. This PR improves fix https://github.com/ClickHouse/ClickHouse/pull/27701. [#27983](https://github.com/ClickHouse/ClickHouse/pull/27983) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#28210](https://github.com/ClickHouse/ClickHouse/issues/28210): Fix cases, when read buffer fails with 'attempt to read after end of file'. Closes [#26149](https://github.com/ClickHouse/ClickHouse/issues/26149). [#28150](https://github.com/ClickHouse/ClickHouse/pull/28150) ([Filatenkov Artur](https://github.com/FArthur-cmd)).
* Backported in [#28750](https://github.com/ClickHouse/ClickHouse/issues/28750): 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)).
#### Build/Testing/Packaging Improvement
* Backported in [#28029](https://github.com/ClickHouse/ClickHouse/issues/28029): Temporarily switched ubuntu apt repository to mirror ru.archive.ubuntu.com as default one(archive.ubuntu.com) is not responding from our CI. [#28016](https://github.com/ClickHouse/ClickHouse/pull/28016) ([Ilya Yatsishin](https://github.com/qoega)).
#### Bug Fix (user-visible misbehaviour in official stable or prestable release)
* Backported in [#27973](https://github.com/ClickHouse/ClickHouse/issues/27973): Fix handling null value with type of Nullable(String) in function JSONExtract. This fixes [#27929](https://github.com/ClickHouse/ClickHouse/issues/27929) and [#27930](https://github.com/ClickHouse/ClickHouse/issues/27930) . This was introduced in https://github.com/ClickHouse/ClickHouse/pull/25452 . [#27939](https://github.com/ClickHouse/ClickHouse/pull/27939) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#28118](https://github.com/ClickHouse/ClickHouse/issues/28118): Fix extremely rare segfaults on shutdown due to incorrect order of context/config reloader shutdown. [#28088](https://github.com/ClickHouse/ClickHouse/pull/28088) ([nvartolomei](https://github.com/nvartolomei)).
* Backported in [#28182](https://github.com/ClickHouse/ClickHouse/issues/28182): Fixed possible excessive number of conditions moved from `WHERE` to `PREWHERE` (optimization controlled by settings `optimize_move_to_prewhere`). [#28139](https://github.com/ClickHouse/ClickHouse/pull/28139) ([lthaooo](https://github.com/lthaooo)).
* Backported in [#28260](https://github.com/ClickHouse/ClickHouse/issues/28260): Multiple small fixes for projections. See detailed description in pr. [#28178](https://github.com/ClickHouse/ClickHouse/pull/28178) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#28257](https://github.com/ClickHouse/ClickHouse/issues/28257): Fix incorrect behavior in `clickhouse-keeper` when list watches (`getChildren`) triggered with `set` requests for children. [#28190](https://github.com/ClickHouse/ClickHouse/pull/28190) ([alesapin](https://github.com/alesapin)).
* Backported in [#28343](https://github.com/ClickHouse/ClickHouse/issues/28343): Fix a rare bug in `clickhouse-keeper` when the client can receive a watch response before request-response. [#28197](https://github.com/ClickHouse/ClickHouse/pull/28197) ([alesapin](https://github.com/alesapin)).
* Backported in [#28261](https://github.com/ClickHouse/ClickHouse/issues/28261): Fix possible read of uninitialized memory for queries with `Nullable(LowCardinality)` type and extremes. Fixes [#28165](https://github.com/ClickHouse/ClickHouse/issues/28165). [#28205](https://github.com/ClickHouse/ClickHouse/pull/28205) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#28253](https://github.com/ClickHouse/ClickHouse/issues/28253): Fix reading of custom TLD w/o new line at EOF. [#28213](https://github.com/ClickHouse/ClickHouse/pull/28213) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#28294](https://github.com/ClickHouse/ClickHouse/issues/28294): Fix inconsistent result in queries with `ORDER BY` and `Merge` tables with enabled setting `optimize_read_in_order`. [#28266](https://github.com/ClickHouse/ClickHouse/pull/28266) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#28401](https://github.com/ClickHouse/ClickHouse/issues/28401): Fix intersecting parts due to new part had been replaced with an empty part. [#28310](https://github.com/ClickHouse/ClickHouse/pull/28310) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#28688](https://github.com/ClickHouse/ClickHouse/issues/28688): Fix NOT-IN index optimization when not all key columns are used. This fixes [#28120](https://github.com/ClickHouse/ClickHouse/issues/28120). [#28315](https://github.com/ClickHouse/ClickHouse/pull/28315) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#28435](https://github.com/ClickHouse/ClickHouse/issues/28435): Fix non joined rows from nullable column. Close [#27691](https://github.com/ClickHouse/ClickHouse/issues/27691). [#28349](https://github.com/ClickHouse/ClickHouse/pull/28349) ([Vladimir C](https://github.com/vdimir)).
* Backported in [#28645](https://github.com/ClickHouse/ClickHouse/issues/28645): Fix rare case when changes of `clickhouse-keeper` settings may lead to lost logs and server hung. [#28360](https://github.com/ClickHouse/ClickHouse/pull/28360) ([alesapin](https://github.com/alesapin)).
* Backported in [#28507](https://github.com/ClickHouse/ClickHouse/issues/28507): Fix lack of quotes for table names in MaterializedPostgreSQL engine. Closes [#28316](https://github.com/ClickHouse/ClickHouse/issues/28316). [#28433](https://github.com/ClickHouse/ClickHouse/pull/28433) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Backported in [#28480](https://github.com/ClickHouse/ClickHouse/issues/28480): 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 [#28572](https://github.com/ClickHouse/ClickHouse/issues/28572): 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 [#28594](https://github.com/ClickHouse/ClickHouse/issues/28594): 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 [#28657](https://github.com/ClickHouse/ClickHouse/issues/28657): Fix UUID overlap in DROP TABLE for internal DDL from MaterializeMySQL. [#28533](https://github.com/ClickHouse/ClickHouse/pull/28533) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#28568](https://github.com/ClickHouse/ClickHouse/issues/28568): Fix endless loop for truncated bzip2 archive. [#28543](https://github.com/ClickHouse/ClickHouse/pull/28543) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#28704](https://github.com/ClickHouse/ClickHouse/issues/28704): - Fix the number of arguments required by s2RectAdd and s2RectContains functions. [#28663](https://github.com/ClickHouse/ClickHouse/pull/28663) ([Bharat Nallan](https://github.com/bharatnc)).
* Backported in [#28715](https://github.com/ClickHouse/ClickHouse/issues/28715): Add Settings.Names, Settings.Values aliases for system.processes table. [#28685](https://github.com/ClickHouse/ClickHouse/pull/28685) ([Vitaly Orlov](https://github.com/orloffv)).
* Backported in [#28744](https://github.com/ClickHouse/ClickHouse/issues/28744): 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)).
#### NOT FOR CHANGELOG / INSIGNIFICANT
* Fix throw without exception in MySQL source. [#28027](https://github.com/ClickHouse/ClickHouse/pull/28027) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix race between REPLACE PARTITION and MOVE PARTITION [#28035](https://github.com/ClickHouse/ClickHouse/pull/28035) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Follow-up to [#28016](https://github.com/ClickHouse/ClickHouse/issues/28016) [#28036](https://github.com/ClickHouse/ClickHouse/pull/28036) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Set version of tzlocal to 2.1 [#28063](https://github.com/ClickHouse/ClickHouse/pull/28063) ([Vitaly Baranov](https://github.com/vitlibar)).
* CHJIT custom memory manager [#28236](https://github.com/ClickHouse/ClickHouse/pull/28236) ([Maksim Kita](https://github.com/kitaisreal)).
* ODBC connection holder fix dangling reference [#28298](https://github.com/ClickHouse/ClickHouse/pull/28298) ([Maksim Kita](https://github.com/kitaisreal)).
* Another try to fix BackgroundPoolTask decrement. [#28353](https://github.com/ClickHouse/ClickHouse/pull/28353) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* More accurate check that zk root exists. [#28412](https://github.com/ClickHouse/ClickHouse/pull/28412) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Function dictGet default implementation for nulls [#28530](https://github.com/ClickHouse/ClickHouse/pull/28530) ([Maksim Kita](https://github.com/kitaisreal)).
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