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https://issues.apache.org/jira/browse/LUCENE-6250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14330241#comment-14330241
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Paul Elschot commented on LUCENE-6250:
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After taking a closer look I think SpanScorer should be changed first to be as
lazy as possible with the underlying Spans.
For example there is a spans.next() call in the SpansScorer constructor, and
that is just not a good idea when doing approximations.
Also I'm adding a Spans.nextAtCurrentDoc() method to allow the span scoring for
a single document to stay at the current document.
This nextAtCurrentDoc() is easy to implement on TermSpans. For the other Span
implementations in core this will take me some time.
> Approximations on Spans
> -----------------------
>
> Key: LUCENE-6250
> URL: https://issues.apache.org/jira/browse/LUCENE-6250
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Paul Elschot
> Attachments: ApproxSpans-20150216a.patch
>
>
> Approximate spans using existing conjunction/disjunction approximations
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