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https://issues.apache.org/jira/browse/LUCENE-4607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-4607:
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Attachment: LUCENE-4607.patch
Patch updated to trunk (as Stefan needs this for LUCENE-4571).
I carefully reviewed all these costs and also integrated it into spans. Though
these queries (e.g. nearquery) dont yet use it, they should.
The only query i changed was to make ConjunctionTermScorer algorithm our
ConjunctionScorer, sorting subscorers on cost (which is docFreq in the all
terms case).
> Add estimateDocCount to DocIdSetIterator
> ----------------------------------------
>
> Key: LUCENE-4607
> URL: https://issues.apache.org/jira/browse/LUCENE-4607
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Fix For: 4.3
>
> Attachments: LUCENE-4607.patch, LUCENE-4607.patch
>
>
> this is essentially a spinnoff from LUCENE-4236
> We currently have no way to make any decsision on how costly a DISI is
> neither when we apply filters nor when we build conjunctions in BQ. Yet we
> have most of the information already and can easily expose them via a cost
> API such that BS and FilteredQuery can apply optimizations on per segment
> basis.
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