[jira] [Commented] (JENA-2317) Apply BGP reorder before filter placement.

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-2317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17511388#comment-17511388 ] 

ASF subversion and git services commented on JENA-2317:
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Commit a00261120bb2706883a9109404514361072a421d in jena's branch refs/heads/main from Andy Seaborne
[ https://gitbox.apache.org/repos/asf?p=jena.git;h=a002611 ]

JENA-2317: Reorder BGPs before filter placement


> Apply BGP reorder before filter placement.
> ------------------------------------------
>
>                 Key: JENA-2317
>                 URL: https://issues.apache.org/jira/browse/JENA-2317
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: ARQ
>    Affects Versions: Jena 4.4.0
>            Reporter: Andy Seaborne
>            Assignee: Andy Seaborne
>            Priority: Major
>             Fix For: Jena 4.5.0
>
>
> The reordering of BGPs is usually left until execution because the pattern may become more grounded during execution.
> Filter are moved around during the optimization of the algebra. This can break up BGPs by putting a filter in the middle of them and that then blocks reordering. Specifically, a triple pattern with two ground terms (and the property is not rdf:type) usually yields only a few results. But if we have a BGP where first pattern is a triple pattern of one ground term and a restriction on the object value (as occurs in BSBM Q5), reordering does not find the better starting point.
>  
>  



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