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23.6.3 Partitioning Limitations Relating to Functions

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This section discusses limitations in MySQL Partitioning relating specifically to functions used in partitioning expressions.

Only the MySQL functions shown in the following list are allowed in partitioning expressions:

In MySQL 8.0, partition pruning is supported for the TO_DAYS(), TO_SECONDS(), YEAR(), and UNIX_TIMESTAMP() functions. See Section 23.4, “Partition Pruning”, for more information.

CEILING() and FLOOR().  Each of these functions returns an integer only if it is passed an argument of an exact numeric type, such as one of the INT types or DECIMAL. This means, for example, that the following CREATE TABLE statement fails with an error, as shown here:

  1. mysql> CREATE TABLE t (c FLOAT) PARTITION BY LIST( FLOOR(c) )(
  2.     ->     PARTITION p0 VALUES IN (1,3,5),
  3.     ->     PARTITION p1 VALUES IN (2,4,6)
  4.     -> );
  5. ERROR 1490 (HY000): The PARTITION function returns the wrong type

EXTRACT() function with WEEK specifier.  The value returned by the EXTRACT() function, when used as EXTRACT(WEEK FROM col), depends on the value of the default_week_format system variable. For this reason, EXTRACT() is not permitted as a partitioning function when it specifies the unit as WEEK. (Bug #54483)

See Section 12.6.2, “Mathematical Functions”, for more information about the return types of these functions, as well as Section 11.2, “Numeric Types”.


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Document created the 26/06/2006, last modified the 26/10/2018
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