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https://issues.apache.org/jira/browse/LUCENE-3623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164335#comment-13164335
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Robert Muir commented on LUCENE-3623:
-------------------------------------
+1, at a glance it wasn't obvious to me what caused the NPE.
So a clear exception would be a big improvement.
> SegmentReader.getFieldNames ignores FieldOption.DOC_VALUES
> ----------------------------------------------------------
>
> Key: LUCENE-3623
> URL: https://issues.apache.org/jira/browse/LUCENE-3623
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Robert Muir
> Attachments: LUCENE-3623.patch, LUCENE-3623.patch, LUCENE-3623.patch,
> LUCENE-3623_test.patch
>
>
> we use this getFieldNames api in segmentmerger if we merge something that
> isn't a SegmentReader (e.g. FilterIndexReader)
> it looks to me that if you use a FilterIndexReader, call
> addIndexes(Reader...) the docvalues will be simply dropped.
> I dont think its enough to just note that the field has docvalues either
> right? We need to also set the type
> correctly in the merged field infos? This would imply that instead of
> FieldOption.DOCVALUES, we need to have a
> FieldOption for each ValueType so that we correctly update the type.
> But looking at FI.update/setDocValues, it doesn't look like we 'type-promote'
> here anyway?
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