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

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layout title displayTitle license
global
REFRESH
REFRESH
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 is used to invalidate and refresh all the cached data (and the associated metadata) for all Datasets that contains the given data source path. Path matching is by prefix, i.e. "/" would invalidate everything that is cached.

Syntax

REFRESH resource_path

Parameters

  • resource_path

    The path of the resource that is to be refreshed.

Examples

-- The Path is resolved using the datasource's File Index.
CREATE TABLE test(ID INT) using parquet;
INSERT INTO test SELECT 1000;
CACHE TABLE test;
INSERT INTO test SELECT 100;
REFRESH "hdfs://path/to/table";

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