v.25.10Bug Fix (user-visible misbehavior in an official stable release)

Fix ALTER COLUMN IF EXISTS commands failing

Official CH changelog text
Fix ALTER COLUMN IF EXISTS commands failing when column state changes within the same ALTER statement. Commands like DROP COLUMN IF EXISTS, MODIFY COLUMN IF EXISTS, COMMENT COLUMN IF EXISTS, and RENAME COLUMN IF EXISTS now properly handle cases where a column is deleted by a previous command in the same statement. #86046 (xiaohuanlin).
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