ClickHouse/docs/changelogs/v22.11.6.44-stable.md

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1	2023

2023 Changelog

ClickHouse release v22.11.6.44-stable (73ddf91298) FIXME as compared to v22.11.5.15-stable (d763e5a923)

Performance Improvement

• Backported in #45703: Fixed performance of short SELECT queries that read from tables with large number ofArray/Map/Nested columns. #45630 (Anton Popov).
• Backported in #46376: 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).

Build/Testing/Packaging Improvement

• Backported in #45977: Fix zookeeper downloading, update the version, and optimize the image size. #44853 (Mikhail f. Shiryaev).
• Backported in #46114: Remove the dependency on the adduser tool from the packages, because we don't use it. This fixes #44934. #45011 (Alexey Milovidov).
• Backported in #46483: Get rid of unnecessary build for standalone clickhouse-keeper. #46367 (Mikhail f. Shiryaev).
• Backported in #46507: Some time ago the ccache compression was changed to zst, but gz archives are downloaded by default. It fixes it by prioritizing zst archive. #46490 (Mikhail f. Shiryaev).

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

• Backported in #45903: Fixed bug with non-parsable default value for EPHEMERAL column in table metadata. #44026 (Yakov Olkhovskiy).
• Backported in #46239: 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 #46216: Fix reading of non existing nested columns with multiple level in compact parts. #46045 (Azat Khuzhin).
• Backported in #46444: Fix possible LOGICAL_ERROR in asynchronous inserts with invalid data sent in format VALUES. #46350 (Anton Popov).
• Backported in #46676: 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).

NOT FOR CHANGELOG / INSIGNIFICANT

• Another attempt to fix automerge, or at least to have debug footprint #45476 (Mikhail f. Shiryaev).
• Add check for running workflows to merge_pr.py #45803 (Mikhail f. Shiryaev).
• Get rid of progress timestamps in release publishing #45818 (Mikhail f. Shiryaev).
• Add necessary dependency for sanitizers #45959 (Mikhail f. Shiryaev).
• Add helping logging to auto-merge script #46080 (Mikhail f. Shiryaev).
• Fix write buffer destruction order for vertical merge. #46205 (Nikolai Kochetov).
• Get rid of legacy DocsReleaseChecks #46665 (Mikhail f. Shiryaev).