[GitHub] [jena] afs commented on issue #1867: Inconsitent behavior of Graph#contains and Graph#find for literal nodes in GraphMem and DatasetGraphInMemory

["afs (via GitHub)" <gi...@apache.org>]

afs commented on issue #1867:
URL: https://github.com/apache/jena/issues/1867#issuecomment-1546931793

   Hi @arne-bdt - thanks for the report.
   
   I think you observe the difference because there is a literal in the predicate position (this means it is not possible via the Model API) and the code doesn't handle it as a value-based search on the find route.
   
   SPARQL - when executed in Fuseki - uses DatasetGraphInMemory mostly.
   
   [There is a discussion](https://lists.apache.org/thread/jl6rj08k55xbhznrjwphm009scm9xtbj) of upcoming external changes leading to a possible Jena5.
   
   That would be a good time to switching to term-equality consistently (lead GraphMem in the codebase but not the default choice).
   
   For any new Graph/Dataset, I'm favour of term-equality. _If_ necessary with an overlay of value equality.
   


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