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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.result;
/**
* This class is in {@link Group} instances where the identifying expression evaluated to null. For example, hits that
* fall outside the buckets of a {@link com.yahoo.search.grouping.request.PredefinedFunction} are added to an
* auto-generated group with this id.
*
* @author Simon Thoresen Hult
*/
public class NullId extends GroupId {
/**
* Constructs a new instance of this class.
*/
public NullId() {
super("null");
}
}
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