presto-main/src/main/java/io/prestosql/operator/SpatialJoinOperator.java/SpatialJoinOperator/createOperator
class SpatialJoinOperator:        @Override
        public Operator createOperator(DriverContext driverContext)
        {
            checkState(!closed, "Factory is already closed");
            OperatorContext operatorContext = driverContext.addOperatorContext(
                    operatorId,
                    planNodeId,
                    SpatialJoinOperator.class.getSimpleName());
            referenceCount.retain();
            return new SpatialJoinOperator(
                    operatorContext,
                    joinType,
                    probeTypes,
                    probeOutputChannels,
                    probeGeometryChannel,
                    partitionChannel,
                    pagesSpatialIndexFactory,
                    referenceCount::release);
        }