Cannot federate with filter-not-exists

[LaurensRietveld]

I'm getting errors federating to other endpoints whenever I use a filter not exist clause such as:

select distinct * {
  service <https://dbpedia.org/sparql> {
    ?s ?p ?o
    filter not exists { ?o ?p ?s }
  }
}
limit 10

This query on uriburner works This other query on our virtuoso endpoint does not work.

Tested this on virtuoso 7.2.5.1, and on the lastest version from master

See here for the translate/explain files: explain.txt translate.txt

[HughWilliams]

Trying to run your This other query on our virtuoso endpoint , it fails with error:

Not found. (#404)
{
  "message": "Not found."
}

Thus is your service online ...

[LaurensRietveld]

@HughWilliams Sorry about that, was debugging a bit too much. I've updated the query from the description to this one

[HughWilliams]

I have been able to recreate this issue and have reported to development to look into and fix ...