org.apache.flink.api.java.summarize.ColumnSummary Maven / Gradle / Ivy
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* 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,
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*/
package org.apache.flink.api.java.summarize;
import org.apache.flink.annotation.PublicEvolving;
/** Summary for a column of values. */
@PublicEvolving
public abstract class ColumnSummary {
/** The number of all rows in this column including both nulls and non-nulls. */
public long getTotalCount() {
return getNullCount() + getNonNullCount();
}
/** The number of non-null values in this column. */
public abstract long getNonNullCount();
/** The number of null values in this column. */
public abstract long getNullCount();
/** True if this column contains any null values. */
public boolean containsNull() {
return getNullCount() > 0L;
}
/** True if this column contains any non-null values. */
public boolean containsNonNull() {
return getNonNullCount() > 0L;
}
}