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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.grouping.request;
/**
* This class represents an count-aggregator in a {@link GroupingExpression}. It evaluates to the number of elements
* there are in the input.
*
* @author Simon Thoresen Hult
* @author bratseth
*/
public class CountAggregator extends AggregatorNode {
/** Constructs a new instance of this class. */
public CountAggregator() {
this(null, null);
}
private CountAggregator(String label, Integer level) {
super("count", label, level);
}
@Override
public CountAggregator copy() {
return new CountAggregator(getLabel(), getLevelOrNull());
}
}
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