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