ClickHouse/docs/changelogs/v21.2.7.11-stable.md

ClickHouse release v21.2.7.11-stable FIXME as compared to v21.2.6.1-stable

Bug Fix

• Backported in #21206: Fix the metadata leak when the Replicated*MergeTree with custom (non default) ZooKeeper cluster is dropped. #21119 (fastio).
• Backported in #21927: Fix Avro format parsing for Kafka. Fixes #21437. #21438 (Ilya Golshtein).
• Backported in #21855: Fix possible error Cannot find column when optimize_skip_unused_shards is enabled and zero shards are used. #21579 (Azat Khuzhin).
• Backported in #21688: Fix fsync_part_directory for horizontal merge. #21642 (Azat Khuzhin).
• Backported in #21795: Fix distributed requests cancellation (for example simple select from multiple shards with limit, i.e. select * from remote('127.{2,3}', system.numbers) limit 100) with async_socket_for_remote=1. #21643 (Azat Khuzhin).
• Backported in #21879: Fix possible crashes in aggregate functions with combinator Distinct, while using two-level aggregation. This is a follow-up fix of https://github.com/ClickHouse/ClickHouse/pull/18365 . Can only reproduced in production env. No test case available yet. cc @CurtizJ. #21818 (Amos Bird).
• Backported in #21979: Reverted #15454 that may cause significant increase in memory usage while loading external dictionaries of hashed type. This closes #21935. #21948 (Maksim Kita).
• Backported in #22140: The function decrypt was lacking a check for the minimal size of data encrypted in AEAD mode. This closes #21897. #22064 (Alexey Milovidov).