presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/SpatialPartitioningStateFactory.java/SpatialPartitioningStateFactory/getSingleStateClass
class SpatialPartitioningStateFactory:    @Override
    public Class<SpatialPartitioningState> getSingleStateClass()
    {
        return SpatialPartitioningState.class;
    }