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https://issues.apache.org/jira/browse/LUCENE-6393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14394969#comment-14394969
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Robert Muir commented on LUCENE-6393:
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This is pretty easy to find by just doing a SpanFirstQuery(someNearQuery, 0).
It only happens when it wraps a span-near query, when it wraps a simple
termquery it never does the wrong thing.
> 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
>
>
> 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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