org.apache.hadoop.hive.ql.io.orc.ColumnStatistics 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.hadoop.hive.ql.io.orc;
/**
* Statistics that are available for all types of columns.
*/
public interface ColumnStatistics {
/**
* Get the number of values in this column. It will differ from the number
* of rows because of NULL values and repeated values.
* @return the number of values
*/
long getNumberOfValues();
/**
* Returns true if there are nulls in the scope of column statistics.
* @return true if null present else false
*/
boolean hasNull();
}