Tables derived from base table only update with accumulation

[SamuelHill]

E.g.

LocationInformation = FromCsv("LocationInformation", Csv("locationInformation"),
    locationType.Key, locationCategory.Indexed, operation, schedule);
NewLocations = Predicate("NewLocations", location, locationType, position, founded, opening);
Locations = Predicate("Locations", location.Key, locationType.Indexed, position.Key, founded, opening);
Locations.Initially.Where(PrimordialLocations);
Locations.Accumulates(NewLocations);
var LocationsOfCategory = Predicate("LocationsOfCategory", 
    location, locationCategory).If(LocationInformation, Locations);

In this case, ideally LocationsOfCategory would only need to be updated whenever Locations is updated, acting like a dynamic EBD but without a direct call to accumulation.

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This might involve larger changes as it breaks with the current Update:

• RecomputeAll
• UpdateDynamicBaseTables
• AppendAllInputs

by requiring some IDBs that are only based on EDBs to not recompute but append with their associated dynamic EDB(s).

[ianhorswill]

I do see the argument for that. But as you say, it requires some fairly complicated analysis. You can achieve the same end now by saying:

var LocationsOfCategory = Predicate("LocationsOfCategory", 
                                            location, locationCategory)
    .Initially.Where(LocationInformation, PrimordialLocations)
    .Add.If(LocationInformation, NewLocations);

[SamuelHill]

var LocationsOfCategory = Predicate("LocationsOfCategory", 
                                            location, locationCategory)
    .Initially.Where(LocationInformation, PrimordialLocations)
    .Add.If(LocationInformation, NewLocations);

Yeah, this makes sense - maybe in Simulog I can have a way of generating that table automatically