presto-main/src/main/java/io/prestosql/operator/SpatialIndexBuilderOperator.java/SpatialIndexBuilderOperator/createOperator
class SpatialIndexBuilderOperator:        @Override
        public SpatialIndexBuilderOperator createOperator(DriverContext driverContext)
        {
            checkState(!closed, "Factory is already closed");
            OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, SpatialIndexBuilderOperator.class.getSimpleName());
            return new SpatialIndexBuilderOperator(
                    operatorContext,
                    pagesSpatialIndexFactory,
                    outputChannels,
                    indexChannel,
                    radiusChannel,
                    partitionChannel,
                    spatialRelationshipTest,
                    filterFunctionFactory,
                    expectedPositions,
                    pagesIndexFactory,
                    spatialPartitions);
        }