[jira] [Created] (JENA-628) TransformFilterPlacement does not always push down through assign/extend when it could

["Rob Vesse (JIRA)" <ji...@apache.org>]

Rob Vesse created JENA-628:
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             Summary: TransformFilterPlacement does not always push down through assign/extend when it could
                 Key: JENA-628
                 URL: https://issues.apache.org/jira/browse/JENA-628
             Project: Apache Jena
          Issue Type: Bug
          Components: ARQ
    Affects Versions: Jena 2.11.1
            Reporter: Rob Vesse
             Fix For: Jena 2.11.2


I've noticed a bug in the improved TransformFilterPlacement where it doesn't always do the correct thing when pushing through assign/extend in cases where the placement into BGPs is disabled.

Consider the following example algebra:

{noformat}
(filter (= ?x 123) (assign ((?z 123)) (bgp (?s ?p ?x)) ))
{noformat}

With optFilterPlacementBGP enabled this produces the following improved algebra:

{noformat}
(assign ((?z 123)) (filter (= ?x 123) (bgp (?s ?p ?x)) ))
{noformat}

However with optFilterPlacementBGP disabled this leaves the algebra as is even though it could safely push it through the bind without pushing it into the BGP itself.

I think the fix for this is trivial and I will apply it shortly.  I will also look and see if there are other cases where it fails to push down as far as it could.



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