presto-main/src/main/java/io/prestosql/operator/ValuesOperator.java/ValuesOperator/ValuesOperator
class ValuesOperator:    public ValuesOperator(OperatorContext operatorContext, List<Page> pages)
    {
        this.operatorContext = requireNonNull(operatorContext, "operatorContext is null");

        requireNonNull(pages, "pages is null");

        this.pages = ImmutableList.copyOf(pages).iterator();
    }