parquet.column.page.PageReadStore Maven / Gradle / Ivy
/**
* Copyright 2012 Twitter, Inc.
*
* Licensed 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 parquet.column.page;
import parquet.column.ColumnDescriptor;
/**
* contains all the readers for all the columns of the corresponding row group
*
* TODO: rename to RowGroup?
*
* @author Julien Le Dem
*
*/
public interface PageReadStore {
/**
*
* @param descriptor the descriptor of the column
* @return the page reader for that column
*/
PageReader getPageReader(ColumnDescriptor descriptor);
/**
*
* @return the total number of rows in that row group
*/
long getRowCount();
}