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https://issues.apache.org/jira/browse/LUCENE-6393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14396368#comment-14396368
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ASF subversion and git services commented on LUCENE-6393:
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Commit 1671420 from [~rcmuir] in branch 'dev/trunk'
[ https://svn.apache.org/r1671420 ]
LUCENE-6393: Add two-phase support to SpanPositionCheckQuery and subclasses
> SpanFirstQuery sometimes returns Spans without any positions
> ------------------------------------------------------------
>
> Key: LUCENE-6393
> URL: https://issues.apache.org/jira/browse/LUCENE-6393
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Fix For: Trunk, 5.2
>
> Attachments: LUCENE-6393-alternative.patch, LUCENE-6393.patch,
> LUCENE-6393.patch, LUCENE-6393.patch
>
>
> This hits an assert in SpanScorer because it breaks the javadocs contract of
> Spans.nextStartPosition():
> * Returns the next start position for the current doc.
> * There is always *at least one start/end position* per doc.
> * After the last start/end position at the current doc this returns
> NO_MORE_POSITIONS.
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