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https://issues.apache.org/jira/browse/COUCHDB-3173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15545555#comment-15545555
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ASF subversion and git services commented on COUCHDB-3173:
----------------------------------------------------------
Commit 37d3778172ca354f124334edf13bc09d9abc28bc in couchdb-couch's branch
refs/heads/master from [~paul.joseph.davis]
[ https://git-wip-us.apache.org/repos/asf?p=couchdb-couch.git;h=37d3778 ]
Fix CouchJS character replacement
This was a bad backport from an old bug. We accidentally backed up when
looking at the second half of a surrogate pair. Instead the backup
should only happen when we see a low half of a surrogate pair with no
preceding high half.
COUCHDB-3173
> Views return corrupt data for text fields containing non-BMP characters
> -----------------------------------------------------------------------
>
> Key: COUCHDB-3173
> URL: https://issues.apache.org/jira/browse/COUCHDB-3173
> Project: CouchDB
> Issue Type: Bug
> Components: JavaScript View Server
> Affects Versions: 2.0.0
> Reporter: Loke
>
> When inserting a non-BMP character (i.e. characters with a Unicode codepoint
> above {{U+FFFF}}), the content gets corrupted after reading it from a view.
> At every instance of such characters, there is an exta {{U+FFFD REPLACEMENT
> CHARACTER}} inserted into the text.
> To reproduce, use the following commands.
> Create the document containing a field with the character {{U+1F604 SMILING
> FACE WITH OPEN MOUTH AND SMILING EYES}}:
> {noformat}
> $ curl -X PUT -d '{"type":"foo","value":"😄"}' http://localhost:5984/foo/foo2
> {"ok":true,"id":"foo2","rev":"1-d7da3cd352ef74f6391cc13601081214"}
> {noformat}
> Get the document to ensure that it was saved properly:
> {noformat}
> curl -X GET http://localhost:5984/foo/foo2
> {"_id":"foo2","_rev":"1-d7da3cd352ef74f6391cc13601081214","type":"foo","value":"😄"}
> {noformat}
> Create a view that will return that document:
> {noformat}
> $ curl --user user:password -X PUT -d
> '{"language":"javascript","views":{"v":{"map":"function(doc){if(doc.type===\"foo\")emit(doc._id,doc);}"}}}'
> http://localhost:5984/foo/_design/bugdemo
> {"ok":true,"id":"_design/bugdemo","rev":"1-817af2dafecb4cf8213aa7063551daac"}
> {noformat}
> Get the document from the view:
> {noformat}
> $ curl -X GET http://localhost:5984/foo/_design/bugdemo/_view/v
> {"total_rows":1,"offset":0,"rows":[
> {"id":"foo2","key":"foo2","value":{"_id":"foo2","_rev":"1-d7da3cd352ef74f6391cc13601081214","type":"foo","value":"😄�"}}
> ]}
> {noformat}
> Now we can see that the field {{value}} now contains two characters. The
> original character as well as {{U+FFFD}}.
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