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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2769) FilterIndexReader in trunk does not implement getSequentialSubReaders() correctly
Date Fri, 19 Nov 2010 09:09:20 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933736#action_12933736
] 

Uwe Schindler commented on LUCENE-2769:
---------------------------------------

We can use the SlowMultiWrapper also to remove norms merging in DirectoryReader.norms(field)
and MultiReader.norms(field) should also throw UOE like fields(). If you need top-level norms
use the SlowMultiReaderWrapper.

> 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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