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sidebar_position: 1
sidebar_label: 2025
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# 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](https://github.com/ClickHouse/ClickHouse/issues/83471): Fix possible crash in Variant type in UNION. [#83295](https://github.com/ClickHouse/ClickHouse/pull/83295) ([Pavel Kruglov](https://github.com/Avogar)).
* Backported in [#83711](https://github.com/ClickHouse/ClickHouse/issues/83711): Disable bounds-based file pruning for iceberg array element and iceberg map values, including all their nested subfields. [#83520](https://github.com/ClickHouse/ClickHouse/pull/83520) ([Daniil Ivanik](https://github.com/divanik)).
* Backported in [#83762](https://github.com/ClickHouse/ClickHouse/issues/83762): Keeper fix: update total watch count correctly when ephemeral nodes are deleted on session close. [#83583](https://github.com/ClickHouse/ClickHouse/pull/83583) ([Antonio Andelic](https://github.com/antonio2368)).

#### NOT FOR CHANGELOG / INSIGNIFICANT

* Backported in [#83811](https://github.com/ClickHouse/ClickHouse/issues/83811): hold the temporary part lock when executeReplaceRange. [#83095](https://github.com/ClickHouse/ClickHouse/pull/83095) ([Sema Checherinda](https://github.com/CheSema)).

