Thaina Yu created COUCHDB-3197:

             Summary: dbupdate feature in additional to dbcopy
                 Key: COUCHDB-3197
             Project: CouchDB
          Issue Type: Wish
          Components: JavaScript View Server
            Reporter: Thaina Yu

DBCopy can only copy result of mapreduce into database as a new document

But couchdb has feature design/update

So I think it would be useful if we could write update function. And set that 
function name to dbupdate after reduce in place of dbcopy

So whenever mapreduce was trigger. Instead of copy result to target database, 
it would pass that reduce document to target update function. We then could use 
reduce document to update another document

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