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

Package Hierarchies:

- All Packages

## Class Hierarchy

- java.lang.Object
  - org.apache.lucene.search.grouping.AbstractAllGroupHeadsCollector.GroupHead<GROUP_VALUE_TYPE>
    - org.apache.lucene.search.grouping.function.FunctionAllGroupHeadsCollector.GroupHead
  - org.apache.lucene.search.grouping.AbstractDistinctValuesCollector.GroupCount<GROUP_VALUE_TYPE>
    - org.apache.lucene.search.grouping.function.FunctionDistinctValuesCollector.GroupCount
  - org.apache.lucene.search.SimpleCollector (implements org.apache.lucene.search.Collector, org.apache.lucene.search.LeafCollector)
    - org.apache.lucene.search.grouping.AbstractAllGroupHeadsCollector<GH>
      - org.apache.lucene.search.grouping.function.FunctionAllGroupHeadsCollector
    - org.apache.lucene.search.grouping.AbstractAllGroupsCollector<GROUP_VALUE_TYPE>
      - org.apache.lucene.search.grouping.function.FunctionAllGroupsCollector
    - org.apache.lucene.search.grouping.AbstractDistinctValuesCollector<GC>
      - org.apache.lucene.search.grouping.function.FunctionDistinctValuesCollector
    - org.apache.lucene.search.grouping.AbstractFirstPassGroupingCollector<GROUP_VALUE_TYPE>
      - org.apache.lucene.search.grouping.function.FunctionFirstPassGroupingCollector
    - org.apache.lucene.search.grouping.AbstractSecondPassGroupingCollector<GROUP_VALUE_TYPE>
      - org.apache.lucene.search.grouping.function.FunctionSecondPassGroupingCollector

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