SHOW FUNCTIONS

Description

View all custom and system provided functions under the database.

Syntax

SHOW [ FULL ] [ BUILTIN ] FUNCTIONS [ { IN | FROM } <db> ]  [ LIKE '<function_pattern>' ]

Varaint Syntax

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

Required Parameters

1. <function_pattern>

Matching pattern rules used to filter function names

Optional Parameters

1. FULL

FULL is an optional parameter.

This parameter indicates the detailed information about the function.

2. BUILTIN

BUILTIN is an optional parameter.

This parameter indicates that the functions provided by the system need to be displayed

3. <db>

db is an optional parameter.

This parameter indicates the query under the specified database

Return Value

Column	Description
Signature	Function name and parameter type
Return Type	The data type of the value returned by the function
Function Type	Type of function
Intermediate Type	Intermediate result type
Properties	Detailed properties of a function

Access Control Requirements

The user who executes this SQL command must have at least the following permissions:

Privilege	Object	Notes
SHOW_PRIV	Function	You need to have the show permission on this function

Examples

show full functions in testDb

*************************** 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))"}

show builtin functions in testDb like 'year%';

+---------------+
| Function Name |
+---------------+
| year          |
| years_add     |
| years_diff    |
| years_sub     |
+---------------+

show global full functions

*************************** 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))"}

show global functions

+---------------+
| Function Name |
+---------------+
| decimal       |
| id_masking    |
+---------------+