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https://issues.apache.org/jira/browse/LUCENE-1312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608466#action_12608466
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Karl Wettin commented on LUCENE-1312:
-------------------------------------

bq. Because the patch looks like a mess with the various changes I copied and 
pasted the alterations to InstantiatedIndexReader to allow the following code 
which works. Basically saving a copy of normsByFieldNameAndDocumentNumber into 
the OceanInstantiatedIndexReader fixes the problem.

I haven't had time to look in to why you need to extend the code, but notice 
that InstantiatedIndexWriter creates a new byte[] on commit so your copy of the 
norms will be out of sync with the index unless you also update it at that 
point. There might be more to this than I can think of right now.

Any other problems with the patch? I'm ready to commit it.

> InstantiatedIndexReader does not implement getFieldNames properly
> -----------------------------------------------------------------
>
>                 Key: LUCENE-1312
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1312
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: contrib/*
>            Reporter: Jason Rutherglen
>            Assignee: Karl Wettin
>         Attachments: lucene-1312.patch, lucene-1312.patch, lucene-1312.patch, 
> lucene-1312.patch, lucene-1312.patch
>
>
> Causes error in org.apache.lucene.index.SegmentMerger.mergeFields

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