[
https://issues.apache.org/jira/browse/JENA-432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630196#comment-13630196
]
Andy Seaborne commented on JENA-432:
------------------------------------
I'm trying to understand this and it's a confusing description at present.
The optimizer does not know about semantically the same!
Are you saying that use of ?test in the OPTIONAL, where the query is materially
affected does not cause the bug?
> Filter optimization messes up when a nested select is present in the same
> block
> -------------------------------------------------------------------------------
>
> Key: JENA-432
> URL: https://issues.apache.org/jira/browse/JENA-432
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 2.10.0
> Reporter: Simon Helsen
>
> The following test query:
> SELECT ?test ?s1
> WHERE {
> ?test ?p1 ?o1.
> FILTER ( ?test = <http://localhost/t1> || ?test = <http://localhost/t2> )
> OPTIONAL {
> SELECT ?s1
> { ?s1 ?p2 ?o2 }
> }
> }
> produces the following plan:
> (project (?test ?s1)
> (disjunction
> (table empty)
> (table empty)))
> Something goes wrong with the FILTER expansion. As a workaround, we observed
> that the following variation:
> SELECT ?test ?s1
> WHERE {
> { ?test ?p1 ?o1.
> FILTER ( ?test = <http://localhost/t1> || ?test = <http://localhost/t2> )
>
> }
> OPTIONAL {
> SELECT ?s1
> { ?s1 ?p2 ?o2 }
> }
> }
> produces the correct plan:
> (project (?test ?s1)
> (leftjoin
> (disjunction
> (assign ((?test <http://localhost/t1>))
> (bgp (triple <http://localhost/t1> ?p1 ?o1)))
> (assign ((?test <http://localhost/t2>))
> (bgp (triple <http://localhost/t2> ?p1 ?o1))))
> (project (?s1)
> (bgp (triple ?s1 ?/p2 ?/o2)))))
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
