61 lines
2.2 KiB
Markdown
61 lines
2.2 KiB
Markdown
|
---
|
||
|
|
layout: global
|
||
|
|
title: REFRESH FUNCTION
|
||
|
|
displayTitle: REFRESH FUNCTION
|
||
|
|
license: |
|
||
|
|
Licensed to the Apache Software Foundation (ASF) under one or more
|
||
|
|
contributor license agreements. See the NOTICE file distributed with
|
||
|
|
this work for additional information regarding copyright ownership.
|
||
|
|
The ASF licenses this file to You under the Apache License, Version 2.0
|
||
|
|
(the "License"); you may not use this file except in compliance with
|
||
|
|
the License. You may obtain a copy of the License at
|
||
|
|
|
||
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
|
||
|
|
Unless required by applicable law or agreed to in writing, software
|
||
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
See the License for the specific language governing permissions and
|
||
|
|
limitations under the License.
|
||
|
|
---
|
||
|
|
|
||
|
|
### Description
|
||
|
|
|
||
|
|
`REFRESH FUNCTION` statement invalidates the cached function entry, which includes a class name
|
||
|
|
and resource location of the given function. The invalidated cache is populated right away.
|
||
|
|
Note that `REFRESH FUNCTION` only works for permanent functions. Refreshing native functions or temporary functions will cause an exception.
|
||
|
|
|
||
|
|
### Syntax
|
||
|
|
|
||
|
|
```sql
|
||
|
|
REFRESH FUNCTION function_identifier
|
||
|
|
```
|
||
|
|
|
||
|
|
### Parameters
|
||
|
|
|
||
|
|
* **function_identifier**
|
||
|
|
|
||
|
|
Specifies a function name, which is either a qualified or unqualified name. If no database identifier is provided, uses the current database.
|
||
|
|
|
||
|
|
**Syntax:** `[ database_name. ] function_name`
|
||
|
|
|
||
|
|
### Examples
|
||
|
|
|
||
|
|
```sql
|
||
|
|
-- The cached entry of the function will be refreshed
|
||
|
|
-- The function is resolved from the current database as the function name is unqualified.
|
||
|
|
REFRESH FUNCTION func1;
|
||
|
|
|
||
|
|
-- The cached entry of the function will be refreshed
|
||
|
|
-- The function is resolved from tempDB database as the function name is qualified.
|
||
|
|
REFRESH FUNCTION db1.func1;
|
||
|
|
```
|
||
|
|
|
||
|
|
### Related Statements
|
||
|
|
|
||
|
|
* [CACHE TABLE](sql-ref-syntax-aux-cache-cache-table.html)
|
||
|
|
* [CLEAR CACHE](sql-ref-syntax-aux-cache-clear-cache.html)
|
||
|
|
* [UNCACHE TABLE](sql-ref-syntax-aux-cache-uncache-table.html)
|
||
|
|
* [REFRESH TABLE](sql-ref-syntax-aux-cache-refresh-table.html)
|
||
|
|
* [REFRESH](sql-ref-syntax-aux-cache-refresh.html)
|