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2025 Changelog

docs/changelogs/v25.9.3.48-stable.md

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2025 Changelog

ClickHouse release v25.9.3.48-stable (9a8e40bbf36) FIXME as compared to v25.9.2.1-stable (c2a9511f7bc)

Improvement

  • Backported in #87981: Filesystem cache improvement: reuse cache priority iterator among threads concurrently reserving space in cache. #87914 (Kseniia Sumarokova).
  • Backported in #88057: To expose the KeeperRequestRejectedDueToSoftMemoryLimitCount keeper profile event, we must add it to KeeperConstants.cpp. #88030 (Miсhael Stetsyuk).

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

  • Backported in #87744: Fixed GeoParquet causing client protocol errors. #84020 (Michael Kolupaev).
  • Backported in #87810: The function checkHeaders is now properly validating the provided headers and reject forbidden headers. Original author: Michael Anastasakis (@michael-anastasakis). #87172 (Raúl Marín).
  • Backported in #87552: Fixed lightweight updates with subqueries that read from another MergeTree tables. #87285 (Anton Popov).
  • Backported in #87829: Fixed direct reading from the text index on object storage. #87399 (Anton Popov).
  • Backported in #87732: Fixes access validation on select and insert for Buffer tables. #87545 (pufit).
  • Backported in #87760: Avoid leaking of tracked memory for async logging (can have a significant drift, for 10 hours, ~100GiB) and text_log (almost same drift is possible). #87584 (Azat Khuzhin).
  • Backported in #87773: Fixed a bug that might lead to overriding global server settings with SELECT settings of a View or Materialized View, if this view was dropped asynchronously and the server was restarted before finishing background cleanup. #87603 (Alexander Tokmakov).
  • Backported in #87797: Fix the generation of the output block in the HashJoin algorithm when the right row list is not used. Fixes #87401. #87699 (Dmitry Novik).
  • Backported in #87852: This closes #86587. #87761 (scanhex12).
  • Backported in #87911: Fix several skip indices bugs. #87817 (Raúl Marín).
  • Backported in #88075: Fix merge with projections when the last block is empty. #87928 (Raúl Marín).
  • Backported in #88100: Fix "High ClickHouse memory usage" warning (exclude page cache). #88092 (Azat Khuzhin).
  • Backported in #88149: Fixed possible data corruption in MergeTree tables with set column TTL. #88095 (Anton Popov).

Build/Testing/Packaging Improvement

NOT FOR CHANGELOG / INSIGNIFICANT