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From http://books.couchdb.org/relax/intro/getting-started
CouchDB views are stored as rows which are kept sorted by key. This makes=
retrieving data from a range of keys efficient even when there are thousan=
ds or millions of rows. When writing CouchDB map functions, your primary go=
al is to build an index that stores related data under nearby keys.
I think I understand what this is trying to say only after reading
several sections later about how a map function can emit any value you
choose from a document to be the key.
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