# Uses of Class
org.apache.lucene.search.grouping.SecondPassGroupingCollector

## Uses of SecondPassGroupingCollector in org.apache.lucene.search.grouping

Subclasses of SecondPassGroupingCollector in org.apache.lucene.search.grouping
Modifier and Type
Class
Description
`class`
`DistinctValuesCollector<T,R>`
A second pass grouping collector that keeps track of distinct values for a specified field for the top N group.
`class`
`TopGroupsCollector<T>`
A second-pass collector that collects the TopDocs for each group, and returns them as a `TopGroups` object