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---
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sidebar_position: 1
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sidebar_label: 2024
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---
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# 2024 Changelog
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### ClickHouse release v24.5.4.49-stable (63b760955a0) FIXME as compared to v24.5.3.5-stable (e0eb66f8e17)
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#### Improvement
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* Backported in [#65886](https://github.com/ClickHouse/ClickHouse/issues/65886): Always start Keeper with sufficient amount of threads in global thread pool. [#64444](https://github.com/ClickHouse/ClickHouse/pull/64444) ([Duc Canh Le](https://github.com/canhld94)).
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* Backported in [#65304](https://github.com/ClickHouse/ClickHouse/issues/65304): Returned back the behaviour of how ClickHouse works and interprets Tuples in CSV format. This change effectively reverts https://github.com/ClickHouse/ClickHouse/pull/60994 and makes it available only under a few settings: `output_format_csv_serialize_tuple_into_separate_columns`, `input_format_csv_deserialize_separate_columns_into_tuple` and `input_format_csv_try_infer_strings_from_quoted_tuples`. [#65170](https://github.com/ClickHouse/ClickHouse/pull/65170) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
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* Backported in [#65896](https://github.com/ClickHouse/ClickHouse/issues/65896): Respect cgroup CPU limit in Keeper. [#65819](https://github.com/ClickHouse/ClickHouse/pull/65819) ([Antonio Andelic](https://github.com/antonio2368)).
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#### Critical Bug Fix (crash, LOGICAL_ERROR, data loss, RBAC)
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* Backported in [#65287](https://github.com/ClickHouse/ClickHouse/issues/65287): Fix crash with UniqInjectiveFunctionsEliminationPass and uniqCombined. [#65188](https://github.com/ClickHouse/ClickHouse/pull/65188) ([Raúl Marín](https://github.com/Algunenano)).
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* Backported in [#65374](https://github.com/ClickHouse/ClickHouse/issues/65374): Fix a bug in ClickHouse Keeper that causes digest mismatch during closing session. [#65198](https://github.com/ClickHouse/ClickHouse/pull/65198) ([Aleksei Filatov](https://github.com/aalexfvk)).
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* Backported in [#65437](https://github.com/ClickHouse/ClickHouse/issues/65437): Forbid `QUALIFY` clause in the old analyzer. The old analyzer ignored `QUALIFY`, so it could lead to unexpected data removal in mutations. [#65356](https://github.com/ClickHouse/ClickHouse/pull/65356) ([Dmitry Novik](https://github.com/novikd)).
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* Backported in [#65450](https://github.com/ClickHouse/ClickHouse/issues/65450): Use correct memory alignment for Distinct combinator. Previously, crash could happen because of invalid memory allocation when the combinator was used. [#65379](https://github.com/ClickHouse/ClickHouse/pull/65379) ([Antonio Andelic](https://github.com/antonio2368)).
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* Backported in [#65712](https://github.com/ClickHouse/ClickHouse/issues/65712): Fix crash in maxIntersections. [#65689](https://github.com/ClickHouse/ClickHouse/pull/65689) ([Raúl Marín](https://github.com/Algunenano)).
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#### Bug Fix (user-visible misbehavior in an official stable release)
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* Backported in [#65681](https://github.com/ClickHouse/ClickHouse/issues/65681): Fix `duplicate alias` error for distributed queries with `ARRAY JOIN`. [#64226](https://github.com/ClickHouse/ClickHouse/pull/64226) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
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* Backported in [#65331](https://github.com/ClickHouse/ClickHouse/issues/65331): Fix the crash loop when restoring from backup is blocked by creating an MV with a definer that hasn't been restored yet. [#64595](https://github.com/ClickHouse/ClickHouse/pull/64595) ([pufit](https://github.com/pufit)).
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* Backported in [#64835](https://github.com/ClickHouse/ClickHouse/issues/64835): Fix bug which could lead to non-working TTLs with expressions. [#64694](https://github.com/ClickHouse/ClickHouse/pull/64694) ([alesapin](https://github.com/alesapin)).
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* Backported in [#65542](https://github.com/ClickHouse/ClickHouse/issues/65542): Fix crash for `ALTER TABLE ... ON CLUSTER ... MODIFY SQL SECURITY`. [#64957](https://github.com/ClickHouse/ClickHouse/pull/64957) ([pufit](https://github.com/pufit)).
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* Backported in [#65580](https://github.com/ClickHouse/ClickHouse/issues/65580): Fix crash on destroying AccessControl: add explicit shutdown. [#64993](https://github.com/ClickHouse/ClickHouse/pull/64993) ([Vitaly Baranov](https://github.com/vitlibar)).
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* Backported in [#65618](https://github.com/ClickHouse/ClickHouse/issues/65618): Fix possible infinite query duration in case of cyclic aliases. Fixes [#64849](https://github.com/ClickHouse/ClickHouse/issues/64849). [#65081](https://github.com/ClickHouse/ClickHouse/pull/65081) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
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* Backported in [#65617](https://github.com/ClickHouse/ClickHouse/issues/65617): Fix aggregate function name rewriting in the new analyzer. [#65110](https://github.com/ClickHouse/ClickHouse/pull/65110) ([Dmitry Novik](https://github.com/novikd)).
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* Backported in [#65732](https://github.com/ClickHouse/ClickHouse/issues/65732): Eliminate injective function in argument of functions `uniq*` recursively. This used to work correctly but was broken in the new analyzer. [#65140](https://github.com/ClickHouse/ClickHouse/pull/65140) ([Duc Canh Le](https://github.com/canhld94)).
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* Backported in [#65265](https://github.com/ClickHouse/ClickHouse/issues/65265): Fix the bug in Hashed and Hashed_Array dictionary short circuit evaluation, which may read uninitialized number, leading to various errors. [#65256](https://github.com/ClickHouse/ClickHouse/pull/65256) ([jsc0218](https://github.com/jsc0218)).
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* Backported in [#65663](https://github.com/ClickHouse/ClickHouse/issues/65663): Disable `non-intersecting-parts` optimization for queries with `FINAL` in case of `read-in-order` optimization was enabled. This could lead to an incorrect query result. As a workaround, disable `do_not_merge_across_partitions_select_final` and `split_parts_ranges_into_intersecting_and_non_intersecting_final` before this fix is merged. [#65505](https://github.com/ClickHouse/ClickHouse/pull/65505) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
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* Backported in [#65788](https://github.com/ClickHouse/ClickHouse/issues/65788): Fixed bug in MergeJoin. Column in sparse serialisation might be treated as a column of its nested type though the required conversion wasn't performed. [#65632](https://github.com/ClickHouse/ClickHouse/pull/65632) ([Nikita Taranov](https://github.com/nickitat)).
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* Backported in [#65812](https://github.com/ClickHouse/ClickHouse/issues/65812): Fix invalid exceptions in function `parseDateTime` with `%F` and `%D` placeholders. [#65768](https://github.com/ClickHouse/ClickHouse/pull/65768) ([Antonio Andelic](https://github.com/antonio2368)).
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* Backported in [#65828](https://github.com/ClickHouse/ClickHouse/issues/65828): Fix a bug in short circuit logic when old analyzer and dictGetOrDefault is used. [#65802](https://github.com/ClickHouse/ClickHouse/pull/65802) ([jsc0218](https://github.com/jsc0218)).
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#### NOT FOR CHANGELOG / INSIGNIFICANT
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* Backported in [#65412](https://github.com/ClickHouse/ClickHouse/issues/65412): Re-enable OpenSSL session caching. [#65111](https://github.com/ClickHouse/ClickHouse/pull/65111) ([Robert Schulze](https://github.com/rschu1ze)).
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* Backported in [#65905](https://github.com/ClickHouse/ClickHouse/issues/65905): Fix bug with session closing in Keeper. [#65735](https://github.com/ClickHouse/ClickHouse/pull/65735) ([Antonio Andelic](https://github.com/antonio2368)).
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Alexey Milovidov