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https://issues.apache.org/jira/browse/LUCENE-6256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14327367#comment-14327367
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Robert Muir commented on LUCENE-6256:
-------------------------------------
+1
> PostingsEnum impls should respect documented behavior when no positions exist
> -----------------------------------------------------------------------------
>
> Key: LUCENE-6256
> URL: https://issues.apache.org/jira/browse/LUCENE-6256
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Ryan Ernst
> Attachments: LUCENE-6256.patch
>
>
> {{PostingsEnum.nextPositions}} says that if no positions exist,
> NO_MORE_POSITIONS will be returned on the first call (actually it refers to
> DocsEnum.NO_MORE_DOCS, which should be changed since DocsEnum doesn't exist
> on trunk). At least one impl (BlockDocsEnum) does {{assert false}} inside
> {{nextPosition()}}. This means if you have assertions turned on (e.g. in a
> test) you get an assertion here, when the behavior should return
> NO_MORE_POSITIONS. I'm still going through all the implementations, but I
> also see {{MultiTermHighlighting}} which returns {{Integer.MAX_VALUE}}. I
> think we should clean up all these implementations which have no positions
> (including maybe the fake scorers that are copied around in a lot of places?)
> to return NO_MORE_POSITIONS.
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