blob: 20791d676a279af8216a05a77ec124a80b6a19e2 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
// Copyright Vespa.ai. 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());
}
}
|