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