# Package org.apache.cassandra.db.aggregation

Class Summary
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
AggregationSpecification.Kind: The `AggregationSpecification` kinds.