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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 sum-aggregator in a {@link GroupingExpression}. It evaluates to the sum of the values that
* the contained expression evaluated to over all the inputs.
*
* @author Simon Thoresen Hult
* @author bratseth
*/
public class SumAggregator extends AggregatorNode {
/**
* Constructs a new instance of this class.
*
* @param expression the expression to aggregate on.
*/
public SumAggregator(GroupingExpression expression) {
this(null, null, expression);
}
private SumAggregator(String label, Integer level, GroupingExpression expression) {
super("sum", label, level, expression);
}
@Override
public SumAggregator copy() {
return new SumAggregator(getLabel(), getLevelOrNull(), getExpression().copy());
}
}
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