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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