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ClickHouse® is a real-time analytics database management system

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Click House v26.6.6.15-stable

Click House: v26.6.6.15-stable Release

Release date:

September 14, 2026

Previous version:

v26.6.5.120-stable (released September 13, 2026)

Magnitude:

29 Diff Delta

Contributors:

4 total committers

Data confidence:

Commits:

20 Commits in this Release

Ordered by the degree to which they evolved the repo in this version.

Backport #101793 to 26.6: Fix ALTER TABLE MODIFY TTL with DateTime causing data loss on 32-bit overflow

Authored September 9, 2026

Backport #118684 to 26.6: Load a `Filesystem` database whose directory is gone instead of refusing to start

Authored September 12, 2026

Backport #119238 to 26.6: Don't use backoffs on concurrent inserts conflicts

Authored September 11, 2026

Backport #114523 to 26.6: Fix wrong results of the partial aggregation strategy in distributed query plans

Authored September 8, 2026

Backport #116529 to 26.6: Fix lost index analysis when parallel replicas estimation is enabled in a subquery

Authored September 8, 2026

Adapt to 26.6: two-argument `dropTable`, no metadata size check

Authored September 13, 2026

Restore the exchange see-through of the row count estimation

Authored September 13, 2026

Fix the build: read the profile event counter explicitly

Authored September 13, 2026

Fix the build: declare `CANNOT_RMDIR` in this translation unit

Authored September 13, 2026

Adapt to 26.6: `table_nodes` holds `QueryTreeNodePtr`

Authored September 13, 2026

Pass the new metadata-replay flag at the `clickhouse-local` call site

Authored September 13, 2026

Fix `AggregatingStep` backport build

Authored September 8, 2026

Drop the explain_query_plan_default pin: the setting does not exist on 26.6

Authored September 10, 2026

Expect the `TO` with `POPULATE` refusal as a client error, not a server one

Authored September 13, 2026

Expect the parser's refusal of `TO` with `POPULATE` in the backported test

Authored September 13, 2026

Hint the row count below the broadcast limit too

Authored September 11, 2026

Fix the build: drop the removed argument from the GROUP BY SET call

Authored September 9, 2026

Drop the catalog-conflict integration test from the 26.6 backport

Authored September 13, 2026

Take the TTL source columns from the syntax analysis, not the built expression

Authored September 13, 2026

Drop the analyzer typing controls the improvement they assert is not here

Authored September 13, 2026

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Top Contributors in v26.6.6.15-stable

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