2025 Changelog

ClickHouse release v25.4.12.9-stable (65820a0cf71) FIXME as compared to v25.4.11.15-stable (d384a0dd98b)

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

• Backported in #83471: Fix possible crash in Variant type in UNION. #83295 (Pavel Kruglov).
• Backported in #83711: Disable bounds-based file pruning for iceberg array element and iceberg map values, including all their nested subfields. #83520 (Daniil Ivanik).
• Backported in #83762: Keeper fix: update total watch count correctly when ephemeral nodes are deleted on session close. #83583 (Antonio Andelic).

NOT FOR CHANGELOG / INSIGNIFICANT

• Backported in #83811: hold the temporary part lock when executeReplaceRange. #83095 (Sema Checherinda).