[GitHub] [couchdb] mikerhodes opened a new issue, #4413: Covering indexes for Mango JSON indexes

["mikerhodes (via GitHub)" <gi...@apache.org>]

mikerhodes opened a new issue, #4413:
URL: https://github.com/apache/couchdb/issues/4413

   [NOTE]: # ( ^^ Provide a general summary of the request in the title above. ^^ )
   
   ## Summary
   
   Provide the ability for Mango to answer a query only using an index, when that index contains all fields needed by a query. 
   
   This should speed up these queries significantly -- PoC benchmarks indicate 2-5x speedups dependent on the number of documents that need to be read from primary data. (5x seen at between 100 and 500 documents for simple one-field query).
   
   ## Desired Behaviour
   
   Described in https://github.com/apache/couchdb/pull/4410.
   
   ## Possible Solution
   
   Described in https://github.com/apache/couchdb/pull/4410.
   
   ## Additional context
   
   None needed beyond RFC.
   


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