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

["Andy Seaborne (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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