ClickHouse Release 26.10
ClickHouse, Friday, November 6th, 2026
ClickHouse 26.10 adds function composition, more flexible joins, faster GROUP BY, disk spilling for IN subqueries and a columns cache.
ClickHouse released version 26.10 with 104 new features, 225 performance optimizations and 739 bug fixes.
Highlights include a function composition operator that makes nested higher-order function calls such as arrayMap and arrayFilter more readable, and more flexible JOIN conditions.
The release also speeds up GROUP BY queries, adds disk spilling for IN subqueries and introduces an experimental columns cache that avoids repeatedly decompressing and deserializing the same data.
New Freeform and SQLite formats add ways to work with text and SQLite files.