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https://issues.apache.org/jira/browse/LUCENE-2064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777764#action_12777764
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Simon Willnauer commented on LUCENE-2064:
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bq. Or simply use the passed in reader as delegate of FakeReader, then it will
behave correctly for all methods.
I agree with the exception, but which reader are you talking about.
Btw. I was close to name it SmartFakeReader :D
> Highlighter should support all MultiTermQuery subclasses without casts
> ----------------------------------------------------------------------
>
> Key: LUCENE-2064
> URL: https://issues.apache.org/jira/browse/LUCENE-2064
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/highlighter
> Affects Versions: 2.9.1
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 3.0
>
> Attachments: LUCENE-2064.txt
>
>
> In order to support MultiTermQuery subclasses the Highlighter component
> applies instanceof checks for concrete classes from the lucene core. This
> prevents classes like RegexQuery in contrib from being supported. Introducing
> dependencies on other contribs is not feasible just for being supported by
> the highlighter.
> While the instanceof checks and subsequent casts might hopefully go somehow
> away in the future but for supporting more multterm queries I have a
> alternative approach using a fake IndexReader that uses a RewriteMethod to
> force the MTQ to pass the field name to the given reader without doing any
> real work. It is easier to explain once you see the patch - I will upload
> shortly.
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