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2025 Changelog

docs/changelogs/v25.4.4.25-stable.md

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2025 Changelog

ClickHouse release v25.4.4.25-stable (c97f6ffeac6) FIXME as compared to v25.4.3.22-stable (f23535c7722)

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

  • Backported in #79981: Fix deserialization of variant discriminators with basic format in compact parts. It was introduced in https://github.com/ClickHouse/ClickHouse/pull/55518. #79000 (Pavel Kruglov).
  • Backported in #79715: Fix using incorrect paths when renaming an Atomic database. #79569 (Tuan Pham Anh).
  • Backported in #80049: Fixes the result of SQL function formatDateTime if a variable-size formatter (e.g. %W aka. weekday Monday Tuesday, etc.) is followed by a compound formatter (a formatter that prints multiple components at once, e.g. %D aka. the American date 05/04/25). #79835 (Robert Schulze).
  • Backported in #80113: IcebergS3 supports count optimization, but IcebergS3Cluster does not. As a result, the count() result returned in cluster mode may be a multiple of the number of replicas. #79844 (wxybear).
  • Backported in #80078: Allow materialized views with UNIONs to work correctly on new replicas. #80037 (Samay Sharma).
  • Backported in #80185: Fix warnings Cannot find 'kernel' in '[...]/memory.stat' in ClickHouse's log (issue #77410). #80129 (Robert Schulze).

NOT FOR CHANGELOG / INSIGNIFICANT