[GitHub] [jena] Tpt commented on issue #1615: LATERAL join

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Tpt commented on issue #1615:
URL: https://github.com/apache/jena/issues/1615#issuecomment-1312569261

   Thank you for moving forward with this idea! It would be amazing if we could come up with a compatible feature in Jena and Oxigraph. It might be a good baseline if the SPARQL 1.2 project somehow restarts.
   
   Thank you for the restriction on introduced variables. I have not thought about it.
   
   For sub-selects, I like the idea of bindings only the variables in the `SELECT` clause and failing if a variable is overridden using `AS`. Thank you! It looks much better than Oxigraph `OX_LATERAL(?s) {SELECT ?s {}}`.
   
   A question: I am a bit not at ease with the `LATERAL { <pattern> }` syntax because `LATERAL` is modifying pattern `<pattern>` evaluation, opposite to e.g. `OPTIONAL`, `UNION` or `MINUS` that just explain who the inner pattern should be joint with the previous one. Having e.g. `LATERAL OPTIONAL` or `LATERAL GRAPH` would make maybe more sense. What do you think about it?
   
   A side question: how to you plan to represents LATERALs in SPARQL S-Expressions? I am trying to keep Oxigraph as compatible as possible with Jena and Ruby-RDF.
   


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