SHOW [FULL] [BUILTIN] FUNCTIONS [IN|FROM db] [LIKE 'function_pattern']
full:表示显示函数的详细信息builtin:表示显示系统提供的函数db: 要查询的数据库名字function_pattern: 用来过滤函数名称的参数
查看数据库下所有的自定义(系统提供)的函数。如果用户指定了数据库，那么查看对应数据库的，否则直接查询当前会话所在数据库
需要对这个数据库拥有 SHOW 权限
mysql> show full functions in testDb\G
*************************** 1. row ***************************
Signature: my_add(INT,INT)
Return Type: INT
Function Type: Scalar
Intermediate Type: NULL
Properties: {"symbol":"_ZN9doris_udf6AddUdfEPNS_15FunctionContextERKNS_6IntValES4_","object_file":"http://host:port/libudfsample.so","md5":"cfe7a362d10f3aaf6c49974ee0f1f878"}
*************************** 2. row ***************************
Signature: my_count(BIGINT)
Return Type: BIGINT
Function Type: Aggregate
Intermediate Type: NULL
Properties: {"object_file":"http://host:port/libudasample.so","finalize_fn":"_ZN9doris_udf13CountFinalizeEPNS_15FunctionContextERKNS_9BigIntValE","init_fn":"_ZN9doris_udf9CountInitEPNS_15FunctionContextEPNS_9BigIntValE","merge_fn":"_ZN9doris_udf10CountMergeEPNS_15FunctionContextERKNS_9BigIntValEPS2_","md5":"37d185f80f95569e2676da3d5b5b9d2f","update_fn":"_ZN9doris_udf11CountUpdateEPNS_15FunctionContextERKNS_6IntValEPNS_9BigIntValE"}
2 rows in set (0.00 sec)
mysql> show builtin functions in testDb like 'year%';
+---------------+
| Function Name |
+---------------+
| year |
| years_add |
| years_diff |
| years_sub |
+---------------+
2 rows in set (0.00 sec)
SHOW,FUNCTIONS