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mysql.func Table

The mysql.func table stores information about user-defined functions (UDFs) created with the CREATE FUNCTION UDF statement.

MariaDB starting with 10.4

In MariaDB 10.4 and later, this table uses the Aria storage engine.

MariaDB until 10.3

In MariaDB 10.3 and before, this table uses the MyISAM storage engine.

The mysql.func table contains the following fields:

Field	Type	Null	Key	Default	Description
`name`	`char(64)`	NO	PRI		UDF name
`ret`	`tinyint(1)`	NO		0
`dl`	`char(128)`	NO			Shared library name
`type`	`enum('function','aggregate')`	NO		`NULL`	Type, either `function` or `aggregate`. Aggregate functions are summary functions such as SUM() and AVG().

Example

SELECT * FROM mysql.func;
+------------------------------+-----+--------------+-----------+
| name                         | ret | dl           | type      |
+------------------------------+-----+--------------+-----------+
| spider_direct_sql            |   2 | ha_spider.so | function  |
| spider_bg_direct_sql         |   2 | ha_spider.so | aggregate |
| spider_ping_table            |   2 | ha_spider.so | function  |
| spider_copy_tables           |   2 | ha_spider.so | function  |
| spider_flush_table_mon_cache |   2 | ha_spider.so | function  |
+------------------------------+-----+--------------+-----------+

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https://mariadb.com/kb/en/mysqlfunc-table/