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https://issues.apache.org/jira/browse/LUCENE-1312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607813#action_12607813
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Karl Wettin commented on LUCENE-1312:
-------------------------------------
bq. The error I was seeing in SegmenMerger was related to how InstantiatedIndex
keeps Document in memory, so any editting of the Document after the Document is
returned by InstantiatedIndexReader later messes up SegmentMerger.
Do you still have the exception? Can you paste it here?
It's a bit dangerous to go modifying the Document instances returned by
InstantiatedIndexReader unless you are really sure of what you are doing. The
documents are the actual index document instances and not a deserialized clones
as when using the Directory implementations.
If you delete a field of such a document it's gone from the index. If you add a
new field not previously known in the index, it will not be in sync with field
options and you'll probably see strange side effects when merging with other
indices, et c.
This could also be seen as a great feature that was lost in documentation. One
of my favorites is to store the domain object(s) as Fieldable in the
document(s) representing them.
I'll add an appropriate comment about this in the javadocs.
> 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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