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https://issues.apache.org/jira/browse/JENA-628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne closed JENA-628.
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> 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
> Assignee: 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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