ClickHouse/docs/changelogs/v21.5.6.6-stable.md

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1	2022

2022 Changelog

ClickHouse release v21.5.6.6-stable FIXME as compared to v21.5.5.12-stable

Bug Fix

• Backported in #24170: Fix a rare bug that could lead to a partially initialized table that can serve write requests (insert/alter/so on). Now such tables will be in readonly mode. #24122 (alesapin).
• Backported in #24332: Set max_threads = 1 to fix mutation fail of StorageMemory. Closes #24274. #24275 (flynn).
• Backported in #24382: Allow empty HTTP headers. Fixes #23901. #24285 (Ivan).
• Backported in #24351: Fixed a bug in moving Materialized View from Ordinary to Atomic database (RENAME TABLE query). Now inner table is moved to new database together with Materialized View. Fixes #23926. #24309 (Alexander Tokmakov).
• Backported in #24509: Fix drop partition with intersect fake parts. In rare cases there might be parts with mutation version greater than current block number. #24321 (Amos Bird).
• Backported in #24540: Fix incorrect monotonicity of toWeek function. This fixes #24422 . This bug was introduced in https://github.com/ClickHouse/ClickHouse/pull/5212 , and was exposed later by smarter partition pruner. #24446 (Amos Bird).
• Backported in #24557: Fixed the behavior when query SYSTEM RESTART REPLICA or SYSTEM SYNC REPLICA is being processed infinitely. This was detected on server with extremely little amount of RAM. #24457 (Nikita Mikhaylov).
• Backported in #24598: Fix usage of tuples in CREATE .. AS SELECT queries. #24464 (Anton Popov).
• Backported in #24601: Enable reading of subcolumns for distributed tables. #24472 (Anton Popov).

NO CL CATEGORY

• Backported in #24750:. #23276 (Alexey Milovidov).

NOT FOR CHANGELOG / INSIGNIFICANT

• Fix segfault in TSan on _exit #23616 (Alexey Milovidov).
• Use memmove in PODArray::insert to handle memory overlapping. #24271 (Fu Zhe).
• Fix cli argument in clickhouse-server.init #24449 (Vladimir C).