couchdb reduce with complex key
===

Suppose we have a few documents in a couchdb, like this


    { page: 'home', country: 'EN', timestamp: 15448 }
    { page: 'search', country: 'FR', timestamp: 15448 }
    { page: 'search', country: 'EN', timestamp: 15448 }
    { page: 'home', country: 'DE', timestamp: 15457 }

Each document represents a pageview from a country with a given timestamp. What i would like to do is query these documents, for a given page, and a timestamp range, get the number of pageviews per country for that range.

What i came up doing is this map function

    function (doc) {
      emit([doc.page, doc.timestamp, doc.country], 1)
    }

and `_sum` as the reduce function.

I can query the view with eg. `startkey=["home",15448]&endkey=["home", 15448, {}]` but this returns the pageviews per country, per day, which is more information than i need. (just the pageviews per country for a given period).

