garrensmith commented on issue #1423: Mango to nodes URL: https://github.com/apache/couchdb/pull/1423#issuecomment-411073720 I think this branch is ready to go now. Here is some final performance testing. I have ran a perf test that would exaggerate this so we can measure. It is a database with 1 million docs that does a query that uses `_all_docs` but doesn't actually return a doc. So each query requires scanning through all the documents in the database. In the first screenshot is the test run on current master CouchDB. Each doc queried is streamed to the coordinator node for the final mango selector test.  This is with this PR, each doc is checked at the node and only the documents that would match the selector would get streamed to the coordinator. In this test no docs would match the selector. As you can see the network activity is greatly reduced. 
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