[GitHub] [jena] Aklakan commented on issue #1557: Make projected dataset in DynamicDataset accessible

[GitBox <gi...@apache.org>]

Aklakan commented on issue #1557:
URL: https://github.com/apache/jena/issues/1557#issuecomment-1264595049

   * Yes, the data is in TDB
   * As you said, if there are 2+ FROM clauses a general distinct is made loading everything into in memory. Otherwise I suspect that the reason is the overhead of materializing the NodeIds into Nodes.
   
   > can be addressed by pushing down the work into TDB
   
   Yes, core of this issue and the PR are about having a general path for pushing the raw FROM clauses and the raw dataset configured in the assembler from Fuseki down to ARQ. I don't think this has to be TDB specific (e.g. a servlet specifically for TDB).
   
   With the current interfaces, the options for doing so seem to be reasonably limited to dataset, query or context. And I agree with your argument that components beneath Fuseki should receive a dataset that per-se only exposes the right amount quads w.r.t. to the protocol and security, as this makes it harder for other components/plugins to accidentally leak information.
   
   The remaining option is to also put the projected dataset into the context just like the named graph and default graphs. But I think it makes sense to have DynamicDataset as the central point for accessing this information (in the PR I added getters for them).
   
   > This isn't easy
   
   Yes, but - as said - I think the first step would be having an easy path from Fuseki to ARQ. 
   
   > requirements that Vilnis Termanis
   
   Which requirements? It seems you forgot to post a link.
   


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