ClickHouse/docs/changelogs/v21.9.3.30-stable.md

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1	2022

2022 Changelog

ClickHouse release v21.9.3.30-stable FIXME as compared to v21.9.2.17-stable

Improvement

• Backported in #28897: Use real tmp file instead of predefined "rows_sources" for vertical merges. This avoids generating garbage directories in tmp disks. #28299 (Amos Bird).

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

• Backported in #28815: Fix possible crash for SELECT with partially created aggregate projection in case of exception. #28700 (Amos Bird).
• Backported in #28789: Fix benign race condition in ReplicatedMergeTreeQueue. Shouldn't be visible for user, but can lead to subtle bugs. #28734 (alesapin).
• Backported in #28842: Fix expressions compilation with short circuit evaluation. #28821 (Azat Khuzhin).
• Backported in #28993: Fixed a race condition between DROP PART and REPLACE/MOVE PARTITION that might cause replicas to diverge in rare cases. #28864 (Alexander Tokmakov).
• Backported in #28949: Fix reading of subcolumns from compact parts. #28873 (Anton Popov).
• Backported in #28925: Fix bug with LowCardinality in short-curcuit function evaluation. Closes #28884. #28887 (Kruglov Pavel).
• Backported in #28927: Fix higher-order array functions (SIGSEGV for arrayCompact/ILLEGAL_COLUMN for arrayDifference/arrayCumSumNonNegative) with consts. #28904 (Azat Khuzhin).
• Backported in #29025: Fix the number of threads used in GLOBAL IN subquery (it was executed in single threads since #19414 bugfix). #28997 (Nikolai Kochetov).

NOT FOR CHANGELOG / INSIGNIFICANT

• Add more checks for LC in native protocol. #27827 (Nikolai Kochetov).
• Fix usage of nested columns with non-array columns with the same prefix [2] #28762 (Anton Popov).
• Lower compiled_expression_cache_size to 128MB #28816 (Maksim Kita).
• Column default dictGet identifier fix #28863 (Maksim Kita).