# Hierarchy For Package org.apache.lucene.search.grouping.function

Package Hierarchies:

- All Packages

## Class Hierarchy

- java.lang.Object
  - org.apache.lucene.search.grouping.AllGroupHeadsCollector.GroupHead<T>
    - org.apache.lucene.search.grouping.function.FunctionAllGroupHeadsCollector.FunctionGroupHead
  - org.apache.lucene.search.grouping.Grouper<T>
    - org.apache.lucene.search.grouping.function.FunctionGrouper
  - org.apache.lucene.search.SimpleCollector (implements org.apache.lucene.search.Collector, org.apache.lucene.search.LeafCollector)
    - org.apache.lucene.search.grouping.AllGroupHeadsCollector<T>
      - org.apache.lucene.search.grouping.function.FunctionAllGroupHeadsCollector
    - org.apache.lucene.search.grouping.AllGroupsCollector<T>
      - org.apache.lucene.search.grouping.function.FunctionAllGroupsCollector
    - org.apache.lucene.search.grouping.DistinctValuesCollector<T>
      - org.apache.lucene.search.grouping.function.FunctionDistinctValuesCollector
    - org.apache.lucene.search.grouping.FirstPassGroupingCollector<T>
      - org.apache.lucene.search.grouping.function.FunctionFirstPassGroupingCollector
    - org.apache.lucene.search.grouping.SecondPassGroupingCollector<T>
      - org.apache.lucene.search.grouping.function.FunctionSecondPassGroupingCollector

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