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https://issues.apache.org/jira/browse/LUCENE-4924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13627721#comment-13627721
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Yonik Seeley commented on LUCENE-4924:
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Undefined can sometimes lead to more efficient implementations in certain
circumstances. IIRC this was actually true of some iterators at some point in
the past, but I don't know if it's still the case.
> Make DocIdSetIterator.docID() return -1 when not positioned
> -----------------------------------------------------------
>
> Key: LUCENE-4924
> URL: https://issues.apache.org/jira/browse/LUCENE-4924
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: 5.0
>
>
> Today DocIdSetIterator.docID() can either return -1 or NO_MORE_DOCS when the
> enum is not positioned. I would like to only allow it to return -1 so that we
> can have better assertions.
> (This proposal is for trunk only.)
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