presto-main/src/main/java/io/prestosql/sql/planner/PlanBuilder.java/PlanBuilder/PlanBuilder
class PlanBuilder:    public PlanBuilder(TranslationMap translations, PlanNode root)
    {
        requireNonNull(translations, "translations is null");
        requireNonNull(root, "root is null");

        this.translations = translations;
        this.root = root;
    }