SHOW-FUNCTIONS
描述
查看数据库下所有的自定义与系统提供的函数。
语法
SHOW [ FULL ] [ BUILTIN ] FUNCTIONS [ { IN | FROM } <db> ] [ LIKE '<function_pattern>' ]
变种语法
SHOW GLOBAL [ FULL ] FUNCTIONS [ LIKE '<function_pattern>' ]
必选参数
1. <function_pattern>
用来过滤函数名称的匹配模式规则
可选参数
1. FULL
FULL 为选填项
若填写表示显示函数的详细信息。
2. BUILTIN
BUILTIN 为选填项
若填写表示需要显示系统提供的函数
3. <db>
db 为选填项
若填写表示在指定的数据库下查询
返回值
列名 | 说明 |
---|---|
Signature | 函数名与参数类型 |
Return Type | 函数返回值的数据类型 |
Function Type | 函数的类型 |
Intermediate Type | 中间结果类型 |
Properties | 函数的详细属性 |
权限控制
执行此 SQL 命令的用户必须至少具有以下权限:
权限(Privilege) | 对象(Object) | 说明(Notes) |
---|---|---|
SHOW_PRIV | 函数 | 需要对该函数有 show 权限 |
示例
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 |
+---------------+