1787
MySQLERRORNotableDDLHIGH confidence
INPLACE ALTER not supported — AUTO_INCREMENT column change
Production Risk
Low — DDL rejected.
What this means
Changing the AUTO_INCREMENT attribute of a column is not supported with ALGORITHM=INPLACE on some storage engines or MySQL versions.
Why it happens
- 1Modifying AUTO_INCREMENT column properties using ALGORITHM=INPLACE.
How to reproduce
trigger — this will error
trigger — this will error
ALTER TABLE tbl ALGORITHM=INPLACE, MODIFY COLUMN id BIGINT AUTO_INCREMENT;
expected output
ERROR 1787 (0A000): ALGORITHM=INPLACE is not supported. Reason: Auto-increment column cannot be changed inplace.
Fix
Use ALGORITHM=COPY for AUTO_INCREMENT column modifications
Use ALGORITHM=COPY for AUTO_INCREMENT column modifications
ALTER TABLE tbl ALGORITHM=COPY, MODIFY COLUMN id BIGINT AUTO_INCREMENT;
Why this works
COPY algorithm rebuilds the table, safely updating the AUTO_INCREMENT attribute.
What not to do
✕
Version notes
Sources
Official documentation ↗
MySQL 8.0 — 1787 ER_ALTER_OPERATION_NOT_SUPPORTED_REASON_AUTOINC
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