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ClickHouse/docs/changelogs/v20.5.4.40-stable.md

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ClickHouse release v20.5.4.40-stable FIXME as compared to v20.5.3.27-stable

Performance Improvement

  • Backported in #12929: Fix "#10574 Index not used for IN operator with literals", performance regression introduced around v19.3. #12062 (nvartolomei).

Bug Fix

  • Backported in #12830: Fix performance for selects with UNION caused by wrong limit for the total number of threads. Fixes #12030. #12103 (Nikolai Kochetov).
  • Backported in #12836: Fixed the behaviour when SummingMergeTree engine sums up columns from partition key. Added an exception in case of explicit definition of columns to sum which intersects with partition key columns. This fixes #7867. #12173 (Nikita Mikhaylov).
  • Backported in #12833: Fixed the behaviour when during multiple sequential inserts in StorageFile header for some special types was written more than once. This fixed #6155. #12197 (Nikita Mikhaylov).
  • Backported in #12895: kafka: fix SIGSEGV if there is an message with error in the middle of the batch. #12302 (Azat Khuzhin).
  • Backported in #12905: Fix TOTALS/ROLLUP/CUBE for aggregate functions with -State and Nullable arguments. This fixes #12163. #12376 (Alexey Milovidov).
  • Backported in #12907: Allow to CLEAR column even if there are depending DEFAULT expressions. This fixes #12333. #12378 (Alexey Milovidov).
  • Backported in #12909: Avoid exception when negative or floating point constant is used in WHERE condition for indexed tables. This fixes #11905. #12384 (Alexey Milovidov).
  • Backported in #12897: Fix crash in JOIN with dictionary when we are joining over expression of dictionary key: t JOIN dict ON expr(dict.id) = t.id. Disable dictionary join optimisation for this case. #12458 (Artem Zuikov).
  • Backported in #13004: Fixed performance issue, while reading from compact parts. #12492 (Anton Popov).
  • Backported in #12892: Fixing race condition in live view tables which could cause data duplication. #12519 (vzakaznikov).
  • Backported in #12888: Now ClickHouse will recalculate checksums for parts when file checksums.txt is absent. Broken since #9827. #12545 (alesapin).
  • Backported in #12873: Fix error Output of TreeExecutor is not sorted for OPTIMIZE DEDUPLICATE. Fixes #11572. #12613 (Nikolai Kochetov).
  • Backported in #12885: Fix possible Pipeline stuck error for queries with external sorting. Fixes #12617. #12618 (Nikolai Kochetov).
  • Backported in #12876: Better exception message in disk access storage. #12625 (alesapin).
  • Backported in #12882: Exception There is no supertype... can be thrown during ALTER ... UPDATE in unexpected cases (e.g. when subtracting from UInt64 column). This fixes #7306. This fixes #4165. #12633 (Alexey Milovidov).
  • Backported in #12879: Add support for function if with Array(UUID) arguments. This fixes #11066. #12648 (Alexey Milovidov).
  • Backported in #12972: Fix SIGSEGV in StorageKafka when broker is unavailable (and not only). #12658 (Azat Khuzhin).
  • Backported in #12860: fixes #10572 fix bloom filter index with const expression. #12659 (Winter Zhang).
  • Backported in #12869: fixes #12293 allow push predicate when subquery contains with clause. #12663 (Winter Zhang).
  • Backported in #12866: Fix memory tracking for input_format_parallel_parsing (by attaching thread to group). #12672 (Azat Khuzhin).
  • Backported in #13185: Fix performance with large tuples, which are interpreted as functions in IN section. The case when user write WHERE x IN tuple(1, 2, ...) instead of WHERE x IN (1, 2, ...) for some obscure reason. #12700 (Anton Popov).
  • Backported in #13032: Corrected merge_with_ttl_timeout logic which did not work well when expiration affected more than one partition over one time interval. (Authored by @excitoon). #12982 (Alexander Kazakov).
  • Backported in #13047: Fix Block structure mismatch error for queries with UNION and JOIN. Fixes #12602. #12989 (Nikolai Kochetov).
  • Backported in #13050: Fix crash which was possible for queries with ORDER BY tuple and small LIMIT. Fixes #12623. #13009 (Nikolai Kochetov).
  • Backported in #13144: Fix wrong index analysis with functions. It could lead to pruning wrong parts, while reading from MergeTree tables. Fixes #13060. Fixes #12406. #13081 (Anton Popov).