ClickHouse/docs/changelogs/v21.6.3.14-stable.md

ClickHouse release v21.6.3.14-stable FIXME as compared to v21.6.2.7-prestable

Improvement

• Backported in #24531: Fix Zero-Copy replication with several S3 volumes (Fixes #22679). #22864 (ianton-ru).
• Backported in #24776: Avoid hiding errors like Limit for rows or bytes to read exceeded for scalar subqueries. #24545 (nvartolomei).

Bug Fix

• Backported in #24727: In "multipart/form-data" message consider the CRLF preceding a boundary as part of it. Fixes #23905. #24399 (Ivan).
• Backported in #24827: - Fixed the deadlock that can happen during LDAP role (re)mapping, when LDAP group is mapped to a nonexistent local role. #24431 (Denis Glazachev).
• Backported in #24936: - If ZooKeeper connection was lost and replica was cloned after restoring the connection, its replication queue might contain outdated entries. It's fixed. - Fixed crash when replication queue contains intersecting virtual parts. It may rarely happen if some data part was lost. Print error in log instead of terminating. #24777 (Alexander Tokmakov).
• Backported in #24851: Fix bug when exception Mutation was killed can be thrown to the client on mutation wait when mutation not loaded into memory yet. #24809 (alesapin).
• Backported in #24916: Fix extremely rare bug on low-memory servers which can lead to the inability to perform merges without restart. Possibly fixes #24603. #24872 (alesapin).
• Backported in #24952: Fix possible heap-buffer-overflow in Arrow. #24922 (Kruglov Pavel).