ClickHouse/docs/changelogs/v20.8.3.18-stable.md

ClickHouse release v20.8.3.18-stable FIXME as compared to v20.8.2.3-stable

Improvement

• Backported in #14874: Allow using multi-volume storage configuration in storage Distributed. #14839 (Pavel Kovalenko).
• Speed up server shutdown process if there are ongoing S3 requests. #14858 (Pavel Kovalenko).

Bug Fix

• Backported in #14600: Fix rare segfaults in functions with combinator -Resample, which could appear in result of overflow with very large parameters. #14562 (Anton Popov).
• Backported in #14727: Cleanup data directory after Zookeeper exceptions during CreateQuery for StorageReplicatedMergeTree Engine. #14563 (Bharat Nallan).
• Backported in #14653: Added the checker as neither calling lc->isNullable() nor calling ls->getDictionaryPtr()->isNullable() would return the correct result. #14591 (Mike Kot).
• Backported in #14666: Fix wrong Decimal multiplication result caused wrong decimal scale of result column. #14603 (Artem Zuikov).
• Backported in #14793: Fix bug when ALTER UPDATE mutation with Nullable column in assignment expression and constant value (like UPDATE x = 42) leads to incorrect value in column or segfault. Fixes #13634, #14045. #14646 (alesapin).
• Backported in #14722: Fixed missed default database name in metadata of materialized view when executing ALTER ... MODIFY QUERY. #14664 (Alexander Tokmakov).
• Backported in #14910: Fix SIGSEGV for an attempt to INSERT into StorageFile(fd). #14887 (Azat Khuzhin).
• Backported in #14943: Fix the issue when some invocations of extractAllGroups function may trigger "Memory limit exceeded" error. This fixes #13383. #14889 (Alexey Milovidov).