On Aug 8, 2011, at 5:43 AM, Jeroen van Dijk wrote:

This is the original thread that gave me the impression it should be
possible: http://comments.gmane.org/gmane.comp.db.couchdb.user/13364

According to that thread (and the commit message) this is just a shortcut to 
avoid having to write a filter function that duplicates an existing map 
function.

Jan wrote "This so you can get a notification for when a view *would* be 
updated if you queried it.”, but I don’t see how that follows. Sure, it will 
tell you when a new revision of a document will appear in the view, but it 
won’t tell you when a document that used to be in the view isn’t any more 
(because the filter function no longer emitted any rows for it). Being notified 
of only insertions and updates but not deletions doesn’t seem useful in 
practice.

—Jens

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