presto-main/src/main/java/io/prestosql/operator/GroupIdOperator.java/GroupIdOperator/GroupIdOperator
class GroupIdOperator:    public GroupIdOperator(
            OperatorContext operatorContext,
            List<Type> types,
            int[][] groupingSetInputs,
            Block[] nullBlocks,
            Block[] groupIdBlocks)
    {
        this.operatorContext = requireNonNull(operatorContext, "operatorContext is null");
        this.types = ImmutableList.copyOf(requireNonNull(types, "types is null"));
        this.groupingSetInputs = requireNonNull(groupingSetInputs, "groupingSetInputs is null");
        this.nullBlocks = requireNonNull(nullBlocks, "nullBlocks is null");
        this.groupIdBlocks = requireNonNull(groupIdBlocks, "groupIdBlocks is null");
    }