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https://issues.apache.org/jira/browse/LUCENE-2784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964820#action_12964820
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Uwe Schindler commented on LUCENE-2784:
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bq. We need tests for this, and to decide how to handle it: e.g. return
emptytermsenum or whatever is my first idea.
For IR.terms() what should be called in MTQ.getTermsEnum(IR) - not MultiFields,
null is a vlaid return value. Mike and you decided that. MTQ's internal
handling can also live with null enum. I will look further into it and post
modified patch!
> Change all FilteredTermsEnum impls into TermsEnum decorators
> ------------------------------------------------------------
>
> Key: LUCENE-2784
> URL: https://issues.apache.org/jira/browse/LUCENE-2784
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Robert Muir
> Assignee: Uwe Schindler
> Fix For: 4.0
>
> Attachments: LUCENE-2784.patch
>
>
> Currently, FilteredTermsEnum has two ctors:
> * FilteredTermsEnum(IndexReader reader, String field)
> * FilteredTermsEnum(TermsEnum tenum)
> But most of our concrete implementations (e.g. TermsRangeEnum) use the
> IndexReader+field ctor
> In my opinion we should remove this ctor, and switch over all
> FilteredTermsEnum implementations to just take a TermsEnum.
> Advantages:
> * This simplifies FilteredTermsEnum and its subclasses, where they are more
> decorator-like (perhaps in the future we could compose them)
> * Removes silly checks such as if (tenum == null) in every next()
> * Allows for consumers to pass in enumerators however they want: e.g. its
> their responsibility if they want to use MultiFields or not, it shouldnt be
> buried in FilteredTermsEnum.
> I created a quick patch (all core+contrib+solr tests pass), but i think this
> opens up more possibilities for refactoring improvements that haven't yet
> been done in the patch: we should explore these too.
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