wohali commented on issue #1853: The $in operator in _find makes the queries 
very slow
URL: https://github.com/apache/couchdb/issues/1853#issuecomment-453662636
 
 
   @garrensmith correct me if I'm wrong, but doesn't the `$in` operator always 
requires a full database scan?
   
   @kobeyk did you create an index first? If so, what is the output of the same 
query being sent to the `/{db}/_explain` endpoint instead?

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