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ClickHouse/docs/changelogs/v20.8.14.4-lts.md

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ClickHouse release v20.8.14.4-lts FIXME as compared to v20.8.13.15-lts

Improvement

  • Backported in #21235: The value of MYSQL_OPT_RECONNECT option can now be controlled by "opt_reconnect" parameter in the config section of mysql replica. #19998 (Alexander Kazakov).
  • Backported in #21203: When loading config for mysql source ClickHouse will now randomize the list of replicas with the same priority to ensure the round-robin logics of picking mysql endpoint. This closes #20629. #20632 (Alexander Kazakov).
  • Backported in #21336: MySQL dictionary source will now retry unexpected connection failures (Lost connection to MySQL server during query) which sometimes happen on SSL/TLS connections. #21237 (Alexander Kazakov).

Bug Fix

  • Backported in #20950: Fix set index invalidation when there are const columns in the subquery. This fixes #17246 . #17249 (Amos Bird).
  • Backported in #20948: Fix crash while reading from JOIN table with LowCardinality types. Fixes #17228. #17397 (Nikolai Kochetov).
  • Backported in #20903: Fix inserting of LowCardinality column to table with TinyLog engine. Fixes #18629. #19010 (Nikolai Kochetov).
  • Backported in #20899: Fix bug when concurrent ALTER and DROP queries may hang while processing ReplicatedMergeTree table. #19237 (alesapin).
  • Backported in #20892: Fix use-after-free of the CompressedWriteBuffer in Connection after disconnect. #19599 (Azat Khuzhin).
  • Backported in #20888: Fix rare bug when some replicated operations (like mutation) cannot process some parts after data corruption. Fixes #19593. #19702 (alesapin).
  • Backported in #21049: Fix usage of -Distinct combinator with -State combinator in aggregate functions. #20866 (Anton Popov).
  • Backported in #21130: Fixed behaviour, when ALTER MODIFY COLUMN created mutation, that will knowingly fail. #21007 (Anton Popov).
  • Backported in #21159: Fix input_format_null_as_default take effective when types are nullable. This fixes #21116 . #21121 (Amos Bird).
  • Backported in #21378: Fix error Bad cast from type ... to DB::ColumnLowCardinality while inserting into table with LowCardinality column from Values format. Fixes #21140. #21357 (Nikolai Kochetov).