# Package org.apache.cassandra.db.aggregation

- Class Summary
  Class | Description
  --- | ---
  AggregationSpecification | Defines how rows should be grouped for creating aggregates.
  AggregationSpecification.Serializer |
  GroupingState | `GroupMaker` state.
  GroupingState.Serializer |
  GroupMaker | A `GroupMaker` can be used to determine if some sorted rows belongs to the same group or not.

- Enum Summary
  Enum | Description
  --- | ---
  AggregationSpecification.Kind | The `AggregationSpecification` kinds.

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