ClickHouse/docs/changelogs/v21.2.3.15-stable.md

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1	2022

2022 Changelog

ClickHouse release v21.2.3.15-stable FIXME as compared to v21.2.2.8-stable

Bug Fix

• Backported in #20241: Fix a bug that moving pieces to destination table may failed in case of launching multiple clickhouse-copiers. #19743 (madianjun).
• Backported in #20296: * Bugfix in StorageJoin. #20079 (Vladimir C).
• Backported in #20389: The MongoDB table engine now establishes connection only when it's going to read data. ATTACH TABLE won't try to connect anymore. #20110 (Vitaly Baranov).
• Backported in #20270: Fix CTE when using in INSERT SELECT. This fixes #20187, fixes #20195. #20211 (Amos Bird).
• Backported in #20329: Fix rare server crash on config reload during the shutdown. Fixes #19689. #20224 (alesapin).
• Backported in #20324: Fix exception during vertical merge for MergeTree table engines family which don't allow to perform vertical merges. Fixes #20259. #20279 (alesapin).
• Backported in #20333: Restrict to DROP or RENAME version column of *CollapsingMergeTree and ReplacingMergeTree table engines. #20300 (alesapin).
• Backported in #20365: Fix too often retries of failed background tasks for ReplicatedMergeTree table engines family. This could lead to too verbose logging and increased CPU load. Fixes #20203. #20335 (alesapin).
• Backported in #20379: Fix incorrect result of binary operations between two constant decimals of different scale. Fixes #20283. #20339 (Maksim Kita).
• Backported in #20376: Fix null dereference with join_use_nulls=1. #20344 (Azat Khuzhin).
• Backported in #20361: Avoid invalid dereference in RANGE_HASHED() dictionary. #20345 (Azat Khuzhin).

NO CL ENTRY

• NO CL ENTRY: 'Revert "Backport #20224 to 21.2: Fix access control manager destruction order"'. #20397 (alesapin).

NOT FOR CHANGELOG / INSIGNIFICANT

• Handle syntax error for ARRAY JOIN with no args #20223 (Vladimir C).