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https://issues.apache.org/jira/browse/LUCENE-2110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-2110:
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Attachment: LUCENE-2110.patch
New patch with the attribute support of LUCENE-2109.
- Also fixes a bug in the BW compatibility layer of MTQ (if clause wrong).
- Some code cleanup in FilteredTermsEnum (now easier to read, as next() and
seekNextTerm is complicated).
- Added EmptyTermsEnum for shortcuts (used by NRQ and TRQ on inverse ranges).
This enum never does any disk I/O to terms dict, it is just empty.
EmptyTermsEnum again supports seeking (although subclass of FilteredTermsEnum),
but it is simple there, it returns just END :-)
I will now port Automaton and apply will provide a combined patch there.
> 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
>
>
> 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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