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sql-ref-syntax-aux-cache-refresh-function.md

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REFRESH FUNCTION
REFRESH FUNCTION
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

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

-- 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;

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