SHOW FUNCTIONS

Description

View all custom (system-provided) functions under the database. If the user specifies a database, then view the corresponding database, otherwise directly query the database where the current session is located

Requires SHOW permission on this database

grammar

SHOW [FULL] [BUILTIN] FUNCTIONS [IN|FROM db] [LIKE 'function_pattern']

Parameters

full: Indicates the detailed information of the display function builtin: Indicates the functions provided by the display system db: database name to query function_pattern: parameter used to filter function names

grammar

SHOW GLOBAL [FULL] FUNCTIONS [LIKE 'function_pattern']

Parameters

global: Indicates it means that the show function is a global function full: Indicates the detailed information of the display function function_pattern: parameter used to filter function names

Note: the "global" keyword is only available after v2.0

Example

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"}
**************************** 3. row ******************** ******
        Signature: id_masking(BIGINT)
      Return Type: VARCHAR
    Function Type: Alias
Intermediate Type: NULL
       Properties: {"parameter":"id","origin_function":"concat(left(`id`, 3), `****`, right(`id`, 4))"}

3 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)

mysql> show global full functions\G;
*************************** 1. row ***************************
        Signature: decimal(ALL, INT, INT)
      Return Type: VARCHAR
    Function Type: Alias
Intermediate Type: NULL
       Properties: {"parameter":"col, precision, scale","origin_function":"CAST(`col` AS decimal(`precision`, `scale`))"}
*************************** 2. row ***************************
        Signature: id_masking(BIGINT)
      Return Type: VARCHAR
    Function Type: Alias
Intermediate Type: NULL
       Properties: {"parameter":"id","origin_function":"concat(left(`id`, 3), `****`, right(`id`, 4))"}
2 rows in set (0.00 sec)
    
mysql> show global functions ;
+---------------+
| Function Name |
+---------------+
| decimal       |
| id_masking    |
+---------------+
2 rows in set (0.00 sec)    
    

Keywords

SHOW, FUNCTIONS

Best Practice