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https://issues.apache.org/jira/browse/LUCENE-2769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-2769:
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Attachment: (was: LUCENE-2769_SegmentMerger.patch)
> 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,
> LUCENE-2769_norms.patch, LUCENE-2769_norms.patch, LUCENE-2769_norms.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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