1782
MySQLERRORNotableDDLHIGH confidence
INPLACE ALTER not supported when renaming a column with foreign key
Production Risk
Low — DDL rejected.
What this means
Renaming a column that is part of a foreign key definition is not supported with ALGORITHM=INPLACE.
Why it happens
- 1CHANGE COLUMN or RENAME COLUMN used on an FK column with ALGORITHM=INPLACE.
How to reproduce
trigger — this will error
trigger — this will error
ALTER TABLE orders ALGORITHM=INPLACE, RENAME COLUMN customer_id TO cust_id; -- col is FK
expected output
ERROR 1782 (0A000): ALGORITHM=INPLACE is not supported. Reason: Columns participating in a foreign key cannot be renamed inplace.
Fix
Use ALGORITHM=COPY when renaming FK columns
Use ALGORITHM=COPY when renaming FK columns
ALTER TABLE orders ALGORITHM=COPY, RENAME COLUMN customer_id TO cust_id;
Why this works
COPY rebuild updates all FK metadata correctly during the rename.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 1782 ER_ALTER_OPERATION_NOT_SUPPORTED_REASON_FK_RENAME
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