v.25.7Improvement

Forbid to start RENAME COLUMN alter mutation

Official CH changelog text
Forbid to start RENAME COLUMN alter mutation if it will rename some column that right now affected by incomplete data mutation. #81823 (Mikhail Artemenko).
Forbid starting a RENAME COLUMN alter mutation if it attempts to rename a column currently affected by an incomplete data mutation.

Why it matters

This feature prevents conflicts and potential data inconsistencies by disallowing the renaming of columns that are involved in ongoing incomplete data mutations, ensuring the stability and correctness of schema changes.

How to use it

This behavior is enabled by default when executing ALTER TABLE ... RENAME COLUMN statements. Attempts to rename a column under an incomplete data mutation will be rejected automatically.

Related resources

PreviousNext