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https://issues.apache.org/jira/browse/LUCENE-3626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13165274#comment-13165274
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Michael McCandless commented on LUCENE-3626:
--------------------------------------------

Shouldn't we just fix MultiDV to "handle" SortedSource?  Ie, merge the terms & 
assign ords, across all subs, just like FieldCache does (using MultiTermsEnum) 
if you ask for DocTermsIndex on a SlowMRWrapper.

It's OK for this op to be costly -- SlowMRReader advertises this...
                
> Make PKIndexSplitter and MultiPassIndexSplitter work per segment
> ----------------------------------------------------------------
>
>                 Key: LUCENE-3626
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3626
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/other
>    Affects Versions: 4.0
>            Reporter: Uwe Schindler
>             Fix For: 4.0
>
>
> Spinoff from LUCENE-3624: DocValuesw merger throws exception on 
> IW.addIndexes(SlowMultiReaderWrapper) as string-index like docvalues cannot 
> provide asSortedSource.

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