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