wohali commented on issue #1204: view queries default to map unless a reduce is 
defined and then they run reduce
URL: https://github.com/apache/couchdb/issues/1204#issuecomment-370855065
   I would say it's better to mention this in the gentle intro to views 
[here](http://docs.couchdb.org/en/latest/ddocs/views/intro.html). If I had to 
guess at a reason, it might be because views are CouchDB's implementation of 
MapReduce, which suggests if both are defined, you want both.
   I don't think it warrants a call-out box in the API reference section, we 
already say:
   > reduce (boolean) ? Use the reduction function. Default is true when a 
reduce function is defined.
   With the increasing focus on Mango (and reduce coming soon to Mango) it 
might be best to ensure the user interface for Mango does something friendly 
and compatible here. /cc @tonysun83 @nickva 

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