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Description
From http://books.couchdb.org/relax/design-documents/views
We use an array key here to support the group_level reduce query paramete=
r. CouchDB=92s views are stored in the Btree file-structure (which will be =
described in more detail in the advanced views section). Because of the way=
Btree=92s are structured, we can cache the intermediate reduce results in =
the non-leaf nodes of the tree, so that reduce queries can be computed alon=
g arbitrary key ranges in logarithmic time.
Btree=92s >> Btrees ?
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