Why is the view index file size so huge?

[Tito Ciuro]

Hello,

I have imported a total of 7 million documents into my sample database. The 
size is now 4.46GB. For reference, I have created the view using the following 
function (formatted for clarity):

{
        "_id": "_design/test",
        "views": {
                "cityPath-byRating": {
                        "map": "function(doc) {
                                if (doc.type == 'test' && doc.rating && 
doc.testPath) {
                                        emit([doc.testPath + ' ' + doc.rating, 
doc._id], null);
                                }
                        }"
                }
        }
}

A sample key being shown in futon looks like this:

> ["Country.United States.San Francisco 100", 
> "cf6ed60fb2e8b6d96122da7b0d1a26f2"]
> ID: cf6ed60fb2e8b6d96122da7b0d1a26f2


To my surprise, the final view file size (found in 
/Users/tito/Library/Application 
Support/CouchDB/var/lib/couchdb/.example_design/mrview) is now 15.12GB! Four 
times the database size!? For one view alone? Is this expected or am I doing 
something really silly? By the way, the UUID type configured is 'sequential'.

Any ideas?

Thanks,

-- Tito