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ClickHouse/docs/changelogs/v22.12.4.76-stable.md

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1 2023

2023 Changelog

ClickHouse release v22.12.4.76-stable (cb5772db80) FIXME as compared to v22.12.3.5-stable (893de538f0)

Performance Improvement

  • Backported in #45704: Fixed performance of short SELECT queries that read from tables with large number ofArray/Map/Nested columns. #45630 (Anton Popov).
  • Backported in #46378: Fix too big memory usage for vertical merges on non-remote disk. Respect max_insert_delayed_streams_for_parallel_write for the remote disk. #46275 (Nikolai Kochetov).

Bug Fix

Build/Testing/Packaging Improvement

Bug Fix (user-visible misbehavior in official stable or prestable release)

  • Backported in #45904: Fixed bug with non-parsable default value for EPHEMERAL column in table metadata. #44026 (Yakov Olkhovskiy).
  • Backported in #45321: Fixed a bug in normalization of a DEFAULT expression in CREATE TABLE statement. The second argument of function in (or the right argument of operator IN) might be replaced with the result of its evaluation during CREATE query execution. Fixes #44496. #44547 (Alexander Tokmakov).
  • Backported in #45000: Another fix for Cannot read all data error which could happen while reading LowCardinality dictionary from remote fs. Fixes #44709. #44875 (Nikolai Kochetov).
  • Backported in #45553: Fix SELECT ... FROM system.dictionaries exception when there is a dictionary with a bad structure (e.g. incorrect type in xml config). #45399 (Aleksei Filatov).
  • Backported in #46226: A couple of seg faults have been reported around c-ares. All of the recent stack traces observed fail on inserting into std::unodered_set<>. I believe I have found the root cause of this, it seems to be unprocessed queries. Prior to this PR, CH calls poll to wait on the file descriptors in the c-ares channel. According to the poll docs, a negative return value means an error has ocurred. Because of this, we would abort the execution and return failure. The problem is that poll will also return a negative value if a system interrupt occurs. A system interrupt does not mean the processing has failed or ended, but we would abort it anyways because we were checking for negative values. Once the execution is aborted, the whole stack is destroyed, which includes the std::unordered_set<std::string> passed to the void * parameter of the c-ares callback. Once c-ares completed the request, the callback would be invoked and would access an invalid memory address causing a segfault. #45629 (Arthur Passos).
  • Backported in #46218: Fix reading of non existing nested columns with multiple level in compact parts. #46045 (Azat Khuzhin).
  • Backported in #46446: Fix possible LOGICAL_ERROR in asynchronous inserts with invalid data sent in format VALUES. #46350 (Anton Popov).
  • Backported in #46678: Fix an invalid processing of constant LowCardinality argument in function arrayMap. This bug could lead to a segfault in release, and logical error Bad cast in debug build. #46569 (Alexey Milovidov).
  • Backported in #46872: Fix a bug in the Map data type. This closes #46855. #46856 (Alexey Milovidov).
  • Backported in #46954: Fix result of LIKE predicates which translate to substring searches and contain quoted non-LIKE metacharacters. #46875 (Robert Schulze).

NOT FOR CHANGELOG / INSIGNIFICANT