// Constructors protected ColumnMappingInspector(CompilableProvider originalProvider) { rootProvider = originalProvider; mappings = new Dictionary <Provider, List <int> >(); outerColumnUsages = new Dictionary <ApplyParameter, List <int> >(); mappingsGatherer = new TupleAccessGatherer((a, b) => { }); var outerMappingsGatherer = new TupleAccessGatherer(RegisterOuterMapping); outerColumnUsageVisitor = new CompilableProviderVisitor((_, e) => { outerMappingsGatherer.Gather(e); return(e); }); }