presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/ImplementIntersectAsUnion.java/ImplementIntersectAsUnion/ImplementIntersectAsUnion
class ImplementIntersectAsUnion:    public ImplementIntersectAsUnion(Metadata metadata)
    {
        this.metadata = requireNonNull(metadata, "metadata is null");
    }