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https://issues.apache.org/jira/browse/LUCENE-3191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13056339#comment-13056339
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Uwe Schindler commented on LUCENE-3191:
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I haven't tracked this issue to understand whats going on here, but you cannot
pass BytesRefs to collator.compare. If this code is ever reached (and looking
at the test i wrote for this damn thing, its unclear if this code is even
necessary?!)
The code is necessary once you cross segments during compare. Maybe the index
in the tests is so small that it never has multiple segments.
> Add TopDocs.merge to merge multiple TopDocs
> -------------------------------------------
>
> Key: LUCENE-3191
> URL: https://issues.apache.org/jira/browse/LUCENE-3191
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.3, 4.0
>
> Attachments: LUCENE-3191-3x.patch,
> LUCENE-3191-SlowCollatorCompareFix.patch, LUCENE-3191.patch,
> LUCENE-3191.patch, LUCENE-3191.patch, LUCENE-3191.patch, LUCENE-3191.patch
>
>
> It's not easy today to merge TopDocs, eg produced by multiple shards,
> supporting arbitrary Sort.
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