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Description

MariaDB Error 1654, 'Partition column values of incorrect type', indicates that an attempt was made to insert or update data into a partitioned table where the value provided for a partition column does not match its defined data type. This error prevents the database from correctly routing the row to its designated partition, leading to data manipulation failure.

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Error Message

Partition column values of incorrect type

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Known Causes

3 known causes

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Data Type Mismatch

Attempting to insert or update a value into a partition column with a data type that is fundamentally incompatible with the column's defined type (e.g., a string for an integer column).

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Invalid Literal Value

Providing a literal value (e.g., '2023-01-01' for an INT year column, or 'abc' for a numeric column) that cannot be implicitly converted by MariaDB to the partition column's expected data type.

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Expression Type Mismatch

A function or expression used to generate the partition column value (e.g., in an INSERT SELECT statement) returns a data type that does not align with the partition column's definition.

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Solutions

3 solutions available

1. Correct Partition Column Data Type medium

Alter the table to use a compatible data type for the partition column.

1

Identify the partition column and its current data type. You can use `SHOW CREATE TABLE your_table_name;` to see the table's structure and partitioning.

SHOW CREATE TABLE your_table_name;

2

Determine the desired data type for the partition column. Common compatible types include `INT`, `BIGINT`, `DATE`, `DATETIME`, `TIMESTAMP`, `VARCHAR`, `CHAR`. Ensure the chosen type can accommodate all existing and future partition key values.

3

Alter the table to change the data type of the partition column. This might involve creating a new column with the correct type, copying data, and then replacing the old column.

ALTER TABLE your_table_name MODIFY COLUMN partition_column_name NEW_DATA_TYPE;
-- Example: ALTER TABLE sales MODIFY COLUMN sale_date DATE;

4

If the table is already partitioned, you'll likely need to re-partition it after changing the column type. This can be a complex operation and may require downtime. Consider the following steps:
1. Create a new table with the desired partitioning scheme and correct column types.
2. Insert data from the old table into the new table.
3. Rename the old table and the new table to replace it.

Alternatively, for simpler cases, you might be able to drop and re-create partitions, but this is generally more involved.

2. Cast Partition Values During Data Insertion easy

Explicitly cast values to the correct data type when inserting data into a partitioned table.

1

When inserting data, ensure that the values for the partition column are of the correct data type. Use SQL casting functions if necessary.

-- If your partition column is DATE and you're inserting a string:
INSERT INTO your_table_name (partition_column_name, other_column) VALUES (STR_TO_DATE('2023-10-27', '%Y-%m-%d'), 'some_value');

-- If your partition column is INT and you're inserting a string representation:
INSERT INTO your_table_name (partition_column_name, other_column) VALUES (CAST('123' AS UNSIGNED), 'some_value');

2

Review your application code or any scripts that perform data insertion to ensure consistent data type handling for the partition column.

3. Recreate Table with Correct Partitioning advanced

Create a new table with the correct partitioning scheme and then migrate data.

1

Create a new table with the same schema as the original table, but with the partition column having the correct data type and the desired partitioning scheme.

-- Example: Original table might have partition_column as VARCHAR, but it should be DATE
CREATE TABLE your_table_name_new (
    id INT PRIMARY KEY,
    partition_column_name DATE,
    other_column VARCHAR(255)
) PARTITION BY RANGE (TO_DAYS(partition_column_name)) (
    PARTITION p202301 VALUES LESS THAN (TO_DAYS('2023-02-01')),
    PARTITION p202302 VALUES LESS THAN (TO_DAYS('2023-03-01'))
    -- ... more partitions
);

2

Copy data from the original table to the new table. Ensure that data is properly converted to the correct data type for the partition column during the transfer.

INSERT INTO your_table_name_new (id, partition_column_name, other_column)
SELECT id, STR_TO_DATE(partition_column_name, '%Y-%m-%d'), other_column FROM your_table_name;

3

Once the data migration is complete and verified, you can drop the old table and rename the new table to take its place. This will likely require a maintenance window.

DROP TABLE your_table_name;
RENAME TABLE your_table_name_new TO your_table_name;

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Related Errors

5 related errors

MariaDB Error 1654: Incorrect Partition Column Data Type