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https://issues.apache.org/jira/browse/COUCHDB-1805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13669343#comment-13669343
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Adam Kocoloski commented on COUCHDB-1805:
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[~pjdavis1970] reminds me that we support raw collation on views, so the right
fix here needs to carry that config information all the way through to the row
grouping.
> Grouping on reduce views tests for equality rather than ICU equivalence
> -----------------------------------------------------------------------
>
> Key: COUCHDB-1805
> URL: https://issues.apache.org/jira/browse/COUCHDB-1805
> Project: CouchDB
> Issue Type: Bug
> Reporter: Adam Kocoloski
>
> If I emit keys from two documents that are distinct but compare equal from
> ICU's point of view, a group=true query over the view will show two distinct
> rows. I think the expected behavior is that the rows are combined when ICU
> collation says the keys compare equal.
> I think part of the fix is to modify the group_rows_fun to call out to ICU
> instead of doing a simple == comparison:
> https://github.com/apache/couchdb/blob/48dc96/src/couch_mrview/src/couch_mrview.erl#L354-L363
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