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https://issues.apache.org/jira/browse/JENA-111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sara Magliacane updated JENA-111:
---------------------------------
Attachment: topk_project.patch
I tried to fix the problem in the most simple way possible, but it won't
compile, because it fails two tests in the DAWG-FInal/solution-seq/ folder (
slice_10.rq and slice_11.rq).
I'm not sure whether this is a problem of this particular code, because usually
in this test the TopN optimization is not triggered since it contains an
OpProject. Moreover, I tried to change the queries from a "SELECT ?v" ->
"SELECT * " and the original code does not pass the test (but maybe my
understanding of what should be returned by a SELECT * in case of a blank node
is wrong.... )
> Improving TopN optimization in case of an intermediate OpModifier
> -----------------------------------------------------------------
>
> Key: JENA-111
> URL: https://issues.apache.org/jira/browse/JENA-111
> Project: Jena
> Issue Type: Improvement
> Components: ARQ
> Reporter: Sara Magliacane
> Priority: Minor
> Labels: arq, optimization
> Attachments: topk_project.patch
>
>
> In the TopN optimization (Jena-89) it would be useful to handle also the
> case in which there are some other OpModifiers (I think they are the only
> category of Ops that can be in that position in the tree) between Slice and
> Order By, for example OpProject:
> (slice _1
> (project ?s ...
> (order by <condition>
> ->
> (project ?s ...
> (top 1 <condition>
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