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Posted to jira@jena.apache.org by "Andy Seaborne (Jira)" <ji...@apache.org> on 2022/03/23 17:26:00 UTC

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

     [ https://issues.apache.org/jira/browse/JENA-2317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne resolved JENA-2317.
---------------------------------
    Resolution: Fixed

> 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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