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ClickHouse 26.3 Drops Experimental Hypothesis Skip Index After Limited Adoption

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ClickHouse 26.3 has removed the experimental Hypothesis Skip Index (TYPE hypothesis), an index type that precomputed whether a boolean expression could evaluate to true within each data granule. The feature was designed to help the query engine skip irrelevant data blocks, but it never advanced beyond experimental status due to known issues with certain data types and limited production adoption. From version 26.3 onward, any attempt to create a table or restore a schema using this index type will result in an error. Users who have existing tables with this index must update their schemas before upgrading to avoid failures. ClickHouse developers recommend migrating to supported skip index types combined with materialized columns to achieve similar query optimization.

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