Slow query over 2 SPARQL endpoints produces no results or errors about comunica

[jeswr]

Using the following SPARQL doesn't get the expected results:

What are you getting instead?

[chenkuncloud]

Hi @jeswr ,I didn't get any return messages.

[rubensworks]

I suspect this is just a performance issue. Your query is essentially pulling in all triples from both endpoints, and doing the filtering client-side.

In any case, when executing the following

comunica-sparql https://dbpedia.org/sparql http://linkedgeodata.org/sparql -q "CONSTRUCT {
  ?s ?p ?o .
}
WHERE {
  ?s ?p ?o .
  FILTER ( ?s = <http://dbpedia.org/resource/Resource_Description_Framework> )
}
LIMIT 100" -l debug

we can see that the query exec starts, but then it terminates without emitting anything (no error, and no empty results). This is a problem indeed, probably as a consequence of some timeout.

[rubensworks]

This actually appears to be a consequence of Virtuoso's Anytime. So I'm closing this one in favor of #606.