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