---
sidebar_position: 1
sidebar_label: 2023
---

# 2023 Changelog

### ClickHouse release v23.5.5.92-stable (557edaddace) FIXME as compared to v23.5.4.25-stable (190f962abcf)

#### Performance Improvement
* Backported in [#52749](https://github.com/ClickHouse/ClickHouse/issues/52749): Fix incorrect projection analysis which invalidates primary keys. This issue only exists when `query_plan_optimize_primary_key = 1, query_plan_optimize_projection = 1` . This fixes [#48823](https://github.com/ClickHouse/ClickHouse/issues/48823) . This fixes [#51173](https://github.com/ClickHouse/ClickHouse/issues/51173) . [#52308](https://github.com/ClickHouse/ClickHouse/pull/52308) ([Amos Bird](https://github.com/amosbird)).

#### Build/Testing/Packaging Improvement
* Backported in [#51886](https://github.com/ClickHouse/ClickHouse/issues/51886): Update cargo dependencies. [#51721](https://github.com/ClickHouse/ClickHouse/pull/51721) ([Raúl Marín](https://github.com/Algunenano)).
* Backported in [#52909](https://github.com/ClickHouse/ClickHouse/issues/52909): Add `clickhouse-keeper-client` symlink to the clickhouse-server package. [#51882](https://github.com/ClickHouse/ClickHouse/pull/51882) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Backported in [#53021](https://github.com/ClickHouse/ClickHouse/issues/53021): Packing inline cache into docker images sometimes causes strange special effects. Since we don't use it at all, it's good to go. [#53008](https://github.com/ClickHouse/ClickHouse/pull/53008) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Backported in [#53289](https://github.com/ClickHouse/ClickHouse/issues/53289): The compiler's profile data (`-ftime-trace`) is uploaded to ClickHouse Cloud., the second attempt after [#53100](https://github.com/ClickHouse/ClickHouse/issues/53100). [#53213](https://github.com/ClickHouse/ClickHouse/pull/53213) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#53463](https://github.com/ClickHouse/ClickHouse/issues/53463): Preserve environment parameters in `clickhouse start` command. Fixes [#51962](https://github.com/ClickHouse/ClickHouse/issues/51962). [#53418](https://github.com/ClickHouse/ClickHouse/pull/53418) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).

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

* Fix backward compatibility for IP types hashing in aggregate functions [#50551](https://github.com/ClickHouse/ClickHouse/pull/50551) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Fix segfault in MathUnary [#51499](https://github.com/ClickHouse/ClickHouse/pull/51499) ([Ilya Yatsishin](https://github.com/qoega)).
* Fix for moving 'IN' conditions to PREWHERE [#51610](https://github.com/ClickHouse/ClickHouse/pull/51610) ([Alexander Gololobov](https://github.com/davenger)).
* Fix binary arithmetic for Nullable(IPv4) [#51642](https://github.com/ClickHouse/ClickHouse/pull/51642) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Support IPv4 and IPv6 as dictionary attributes [#51756](https://github.com/ClickHouse/ClickHouse/pull/51756) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Fix reading from empty column in `parseSipHashKey` [#51804](https://github.com/ClickHouse/ClickHouse/pull/51804) ([Nikita Taranov](https://github.com/nickitat)).
* Fix async connect to hosts with multiple ips [#51934](https://github.com/ClickHouse/ClickHouse/pull/51934) ([Kruglov Pavel](https://github.com/Avogar)).
* Allow parametric UDFs [#51964](https://github.com/ClickHouse/ClickHouse/pull/51964) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix ORDER BY tuple of WINDOW functions [#52145](https://github.com/ClickHouse/ClickHouse/pull/52145) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix error in `groupArrayMoving` functions [#52161](https://github.com/ClickHouse/ClickHouse/pull/52161) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Disable expression templates for time intervals [#52335](https://github.com/ClickHouse/ClickHouse/pull/52335) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Fix `countSubstrings()` hang with empty needle and a column haystack [#52409](https://github.com/ClickHouse/ClickHouse/pull/52409) ([Sergei Trifonov](https://github.com/serxa)).
* Fixed inserting into Buffer engine [#52440](https://github.com/ClickHouse/ClickHouse/pull/52440) ([Vasily Nemkov](https://github.com/Enmk)).
* The implementation of AnyHash was non-conformant. [#52448](https://github.com/ClickHouse/ClickHouse/pull/52448) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Fix possible error "Cannot drain connections: cancel first" [#52585](https://github.com/ClickHouse/ClickHouse/pull/52585) ([Kruglov Pavel](https://github.com/Avogar)).
* init and destroy ares channel on demand.. [#52634](https://github.com/ClickHouse/ClickHouse/pull/52634) ([Arthur Passos](https://github.com/arthurpassos)).
* Fix crash in function `tuple` with one sparse column argument [#52659](https://github.com/ClickHouse/ClickHouse/pull/52659) ([Anton Popov](https://github.com/CurtizJ)).
* clickhouse-keeper: fix implementation of server with poll() [#52833](https://github.com/ClickHouse/ClickHouse/pull/52833) ([Andy Fiddaman](https://github.com/citrus-it)).
* Fix password leak in show create mysql table [#52962](https://github.com/ClickHouse/ClickHouse/pull/52962) ([Duc Canh Le](https://github.com/canhld94)).
* Not-ready Set [#53162](https://github.com/ClickHouse/ClickHouse/pull/53162) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix incorrect normal projection AST format [#53347](https://github.com/ClickHouse/ClickHouse/pull/53347) ([Amos Bird](https://github.com/amosbird)).
* Fix loading lazy database during system.table select query [#53372](https://github.com/ClickHouse/ClickHouse/pull/53372) ([SmitaRKulkarni](https://github.com/SmitaRKulkarni)).
* Fix: interpolate expression takes source column instead of same name aliased from select expression. [#53572](https://github.com/ClickHouse/ClickHouse/pull/53572) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Correctly handle totals and extremes with `DelayedSource` [#53644](https://github.com/ClickHouse/ClickHouse/pull/53644) ([Antonio Andelic](https://github.com/antonio2368)).
* Fix: sorted distinct with sparse columns [#53711](https://github.com/ClickHouse/ClickHouse/pull/53711) ([Igor Nikonov](https://github.com/devcrafter)).
* Fix fuzzer crash in parseDateTime() [#53764](https://github.com/ClickHouse/ClickHouse/pull/53764) ([Robert Schulze](https://github.com/rschu1ze)).

#### NOT FOR CHANGELOG / INSIGNIFICANT

* Decoupled commits from [#51180](https://github.com/ClickHouse/ClickHouse/issues/51180) for backports [#51561](https://github.com/ClickHouse/ClickHouse/pull/51561) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Fix MergeTreeMarksLoader segfaulting if marks file is longer than expected [#51636](https://github.com/ClickHouse/ClickHouse/pull/51636) ([Michael Kolupaev](https://github.com/al13n321)).
* Fix source image for sqllogic [#51728](https://github.com/ClickHouse/ClickHouse/pull/51728) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).
* Pin rust nightly (to make it stable) [#51903](https://github.com/ClickHouse/ClickHouse/pull/51903) ([Azat Khuzhin](https://github.com/azat)).
* Fix crash in comparison functions due to incorrect query analysis [#52172](https://github.com/ClickHouse/ClickHouse/pull/52172) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Less replication errors [#52382](https://github.com/ClickHouse/ClickHouse/pull/52382) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Improve logging macros [#52519](https://github.com/ClickHouse/ClickHouse/pull/52519) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Fix deadlocks in StorageTableFunctionProxy [#52626](https://github.com/ClickHouse/ClickHouse/pull/52626) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Disable test_reverse_dns_query/test.py [#53195](https://github.com/ClickHouse/ClickHouse/pull/53195) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Disable test_host_regexp_multiple_ptr_records/test.py [#53211](https://github.com/ClickHouse/ClickHouse/pull/53211) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Get rid of describe_parameters for the best robot token [#53833](https://github.com/ClickHouse/ClickHouse/pull/53833) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).