presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/SpatialPartitioningInternalAggregateFunction.java/SpatialPartitioningInternalAggregateFunction/combine
class SpatialPartitioningInternalAggregateFunction:    @CombineFunction
    public static void combine(SpatialPartitioningState state, SpatialPartitioningState otherState)
    {
        throw new UnsupportedOperationException("spatial_partitioning must run on a single node");
    }