86 lines
2.9 KiB
Markdown
86 lines
2.9 KiB
Markdown
---
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{
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"title": "SHOW FUNCTIONS",
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"language": "zh-CN"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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# SHOW FUNCTIONS
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## description
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### Syntax
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```
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SHOW [FULL] [BUILTIN] FUNCTIONS [IN|FROM db] [LIKE 'function_pattern']
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```
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### Parameters
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>`full`:表示显示函数的详细信息
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>`builtin`:表示显示系统提供的函数
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>`db`: 要查询的数据库名字
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>`function_pattern`: 用来过滤函数名称的参数
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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
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需要对这个数据库拥有 `SHOW` 权限
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## example
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```
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mysql> show full functions in testDb\G
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*************************** 1. row ***************************
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Signature: my_add(INT,INT)
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Return Type: INT
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Function Type: Scalar
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Intermediate Type: NULL
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Properties: {"symbol":"_ZN9doris_udf6AddUdfEPNS_15FunctionContextERKNS_6IntValES4_","object_file":"http://host:port/libudfsample.so","md5":"cfe7a362d10f3aaf6c49974ee0f1f878"}
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*************************** 2. row ***************************
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Signature: my_count(BIGINT)
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Return Type: BIGINT
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Function Type: Aggregate
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Intermediate Type: NULL
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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"}
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*************************** 3. row ***************************
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Signature: id_masking(BIGINT)
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Return Type: VARCHAR
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Function Type: Alias
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Intermediate Type: NULL
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Properties: {"parameter":"id","origin_function":"concat(left(`id`, 3), `****`, right(`id`, 4))"}
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3 rows in set (0.00 sec)
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mysql> show builtin functions in testDb like 'year%';
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+---------------+
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| Function Name |
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+---------------+
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| year |
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| years_add |
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| years_diff |
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| years_sub |
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+---------------+
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2 rows in set (0.00 sec)
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```
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## keyword
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SHOW,FUNCTIONS
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