1566
MySQLERRORNotablePartitioningHIGH confidence
Partition function is not allowed
Production Risk
Low — the DDL fails; no table is created.
What this means
The expression used as the partitioning function is not permitted.
Why it happens
- 1The partition function uses a disallowed expression such as a subquery, stored function, or non-deterministic function.
- 2A column used in partitioning is of an unsupported type.
How to reproduce
trigger — this will error
trigger — this will error
CREATE TABLE t (id INT, val VARCHAR(10)) PARTITION BY HASH(LENGTH(val)) PARTITIONS 4;
expected output
ERROR 1566 (HY000): This partition function is not allowed
Fix
Use a deterministic, allowed expression
Use a deterministic, allowed expression
CREATE TABLE t (id INT) PARTITION BY HASH(id) PARTITIONS 4;
Why this works
Partitioning functions must be deterministic and use only integer-returning expressions on column values.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 1566 ER_PARTITION_FUNCTION_IS_NOT_ALLOWED
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