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https://issues.apache.org/jira/browse/LUCENE-2769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933729#action_12933729
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Uwe Schindler commented on LUCENE-2769:
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Additionally to this:
The MultiPassIndexSplitter in 3.x and 3.0 should also return null in
getSeqSubReaders. It works currently because we know how SegmentMerger works,
but its still incorrect. To Filter the terms correctly it should imitate a
atomic reader.
> FilterIndexReader in trunk does not implement getSequentialSubReaders()
> correctly
> ---------------------------------------------------------------------------------
>
> Key: LUCENE-2769
> URL: https://issues.apache.org/jira/browse/LUCENE-2769
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Uwe Schindler
> Attachments: LUCENE-2769.patch, LUCENE-2769.patch
>
>
> Since LUCENE-2459, getSequentialSubReaders() in FilterIndexReader returns
> null, so it returns an atomic reader. But If you call then any of the enum
> methods, it throws Exception because the underlying reader is not atomic.
> We should move the null-returning method to SlowMultiReaderWrapper and fix
> FilterIndexReader's default to return in.getSequentialSubReaders(). Ideally
> an implementation must of course also wrap the sub-readers.
> If we change this we have to look into other Impls like the
> MultiPassIndexSplitter if we need to add atomicity.
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