presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/SpatialPartitioningStateFactory.java/SpatialPartitioningStateFactory/createGroupedState
class SpatialPartitioningStateFactory:    @Override
    public SpatialPartitioningState createGroupedState()
    {
        return new GroupedSpatialPartitioningState();
    }