org.apache.parquet.column.page.DictionaryPageReadStore Maven / Gradle / Ivy
/*
* 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.
*/
package org.apache.parquet.column.page;
import org.apache.parquet.column.ColumnDescriptor;
/**
* Interface to read dictionary pages for all the columns of a row group
*/
public interface DictionaryPageReadStore {
/**
* Returns a {@link DictionaryPage} for the given column descriptor.
* The dictionary page bytes are uncompressed.
*
* @param descriptor the descriptor of the column
* @return the DictionaryPage for that column, or null if there isn't one
*/
DictionaryPage readDictionaryPage(ColumnDescriptor descriptor);
}