| Class | Description | 
|---|---|
| AggregationSpecification | Defines how rows should be grouped for creating aggregates. | 
| AggregationSpecification.Serializer | |
| GroupingState | GroupMakerstate. | 
| GroupingState.Serializer | |
| GroupMaker | A  GroupMakercan be used to determine if some sorted rows belongs to the same group or not. | 
| Enum | Description | 
|---|---|
| AggregationSpecification.Kind | The  AggregationSpecificationkinds. | 
Copyright © 2018 The Apache Software Foundation