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https://issues.apache.org/jira/browse/LUCENE-2110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12786457#action_12786457
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Uwe Schindler commented on LUCENE-2110:
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I have a solution for this problem: If the end of the enum is reached i just
asks for a new term is seek==true (that is what iwas before). But
nextPrefixTerm() gets the information that the end was already finished and
*could* return null then. This is important for automaton, because it would
loop endless else (because it would produce terms and terms and terms... in
nextSeekTerm).
> Change FilteredTermsEnum to work like Iterator, so it is not positioned and
> next() must be always called first. Remove empty()
> ------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2110
> URL: https://issues.apache.org/jira/browse/LUCENE-2110
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: Flex Branch
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: Flex Branch
>
> Attachments: LUCENE-2110.patch, LUCENE-2110.patch, LUCENE-2110.patch,
> LUCENE-2110.patch
>
>
> FilteredTermsEnum is confusing as it is initially positioned to the first
> term. It should instead work like an uninitialized TermsEnum for a field
> before the first call to next() or seek().
> Also document that not all FilteredTermsEnums may implement seek() as eg. NRQ
> or Automaton are not able to support this. Seeking is also not needed for MTQ
> at all, so seek can just throw UOE.
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