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2022 Changelog
ClickHouse release v21.4.6.55-stable FIXME as compared to v21.4.5.46-stable
Improvement
- Backported in #23679: Fixed
quantile(s)TDigest. Added special handling of singleton centroids according to tdunning/t-digest 3.2+. Also a bug with over-compression of centroids in implementation of earlier version of the algorithm was fixed. #23314 (Vladimir Chebotarev).
Bug Fix
- Backported in #23580: Fixed very rare race condition on background cleanup of old blocks. It might cause a block not to be deduplicated if it's too close to the end of deduplication window. #23301 (Alexander Tokmakov).
- Backported in #23676: Don't relax NOT conditions during partition pruning. This fixes #23305 and #21539. #23310 (Amos Bird).
- Backported in #23583: * Fix bug in dict join with join_algorithm = 'auto'. Close #23002. #23312 (Vladimir C).
- Backported in #23641: Fix incompatible constant expression generation during partition pruning based on virtual columns. This fixes https://github.com/ClickHouse/ClickHouse/pull/21401#discussion_r611888913. #23366 (Amos Bird).
- Backported in #23586: Allow to move more conditions to
PREWHEREas it was before version 21.1. Insufficient number of moved condtions could lead to worse performance. #23397 (Anton Popov). - Backported in #23588: Fixed
Cannot unlink fileerror on unsuccessful creation of ReplicatedMergeTree table with multidisk configuration. This closes #21755. #23433 (Alexander Tokmakov). - Backported in #23591: Fix corner cases in vertical merges with
ReplacingMergeTree. In rare cases they could lead to fails of merges with exceptions likeIncomplete granules are not allowed while blocks are granules size. #23459 (Anton Popov). - Backported in #23611: Fix restart / stop command hanging. Closes #20214. #23552 (filimonov).
- Backported in #23693: Fixed server fault when inserting data through HTTP caused an exception. This fixes #23512. #23643 (Nikita Mikhaylov).
- Backported in #23695: Added an exception in case of completely the same values in both samples in aggregate function
mannWhitneyUTest. This fixes #23646. #23654 (Nikita Mikhaylov). - Backported in #23774: Avoid possible "Cannot schedule a task" error (in case some exception had been occurred) on INSERT into Distributed. #23744 (Azat Khuzhin).