EC
1509
MySQLERRORNotablePartitioningHIGH confidence

BLOB field is not allowed in partition function

Production Risk

Low — DDL error; the table will not be created.

What this means

ER_BLOB_FIELD_IN_PART_FUNC_ERROR (1509, SQLSTATE HY000) is raised when a BLOB or TEXT column is referenced in a partitioning function.

Why it happens
  1. 1Attempting to use a BLOB, TEXT, GEOMETRY, or JSON column directly in the PARTITION BY expression
How to reproduce
trigger — this will error
trigger — this will error
CREATE TABLE t (id INT, content TEXT)
PARTITION BY HASH(content)  -- TEXT/BLOB not allowed
PARTITIONS 4;

expected output

ERROR 1509 (HY000): A BLOB field is not allowed in partition function

Fix

Use an integer or date column for partitioning

Use an integer or date column for partitioning
-- Partition by an integer or date column instead:
CREATE TABLE t (id INT, content TEXT)
PARTITION BY HASH(id)
PARTITIONS 4;

-- Or use a computed integer column:
CREATE TABLE t (id INT, content TEXT, content_len INT GENERATED ALWAYS AS (LENGTH(content)) STORED)
PARTITION BY RANGE(content_len) (
  PARTITION p_small VALUES LESS THAN (1000),
  PARTITION p_large VALUES LESS THAN MAXVALUE
);

Why this works

BLOB and TEXT types are variable-length and cannot be used in partition functions; use numeric or date types.

Sources
Official documentation ↗

MySQL 8.0 — 1509 ER_BLOB_FIELD_IN_PART_FUNC_ERROR

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