<p>MySQL cannot parse the conflict resolution function defined in a foreign key or partition clause, so the statement fails.</p>
<p>MySQL Error 1626: ER_CONFLICT_FN_PARSE_ERROR occurs when the server cannot parse a conflict function in a foreign key or partition clause. Use valid ON CONFLICT syntax or remove unsupported conflict functions to resolve the error.</p>
ER_CONFLICT_FN_PARSE_ERROR
The server raises this error when it encounters an unrecognized or malformed conflict function while parsing a DDL or DML statement.
It usually appears during CREATE TABLE, ALTER TABLE, or INSERT ... ON CONFLICT statements that contain custom conflict handlers or partition conflict clauses.
MySQL expects a specific grammar for ON CONFLICT clauses and partition conflict handlers. Any deviation triggers a parse failure.
Unsupported conflict functions from other databases, misplaced parentheses, or missing parameters frequently lead to error 1626.
Validate the ON CONFLICT syntax against the MySQL reference manual. Remove or rewrite functions that MySQL does not support.
Run EXPLAIN on the statement to pinpoint the exact token where parsing stops, then adjust the clause accordingly.
When migrating from PostgreSQL, replace ON CONFLICT DO NOTHING with INSERT IGNORE or ON DUPLICATE KEY UPDATE.
If using partition conflict functions, ensure each subpartition key matches the partition expression exactly.
Stick to MySQL specific syntax, enable strict SQL mode during development, and run automated linting checks.
Test migrations in a staging environment before running them in production to catch parse errors early.
Errors 1064 (syntax error) and 1239 (bad table reference) often surface together during incompatible DDL migrations; apply the same review steps.
PostgreSQL style ON CONFLICT clauses copied verbatim into MySQL generate parse failures.
Extra tokens break the parser, causing it to misinterpret the conflict function.
Older versions lack full ON DUPLICATE KEY functionality, so new clauses fail.
Applications that concatenate strings may inject invalid characters into the final query.
General syntax error that appears for many invalid statements.
Raised when foreign key definitions reference nonmatching columns.
Occurs when a subquery references a temporary name incorrectly.
No. Use INSERT IGNORE or ON DUPLICATE KEY UPDATE for equivalent behavior.
All currently supported versions produce the error when encountering malformed conflict functions.
No. The statement must be valid SQL before the server will execute it.
Galaxy highlights invalid syntax in real time, offers AI-powered corrections, and enforces MySQL dialect rules.
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