[GitHub] tonysun83 commented on issue #863: Fix exists false when field is explicitly defined

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tonysun83 commented on issue #863: Fix exists false when field is explicitly defined
URL: https://github.com/apache/couchdb/pull/863#issuecomment-334526790
 
 
   @willholley : It's worth noting that the behavior is going to be different for because of how we perceive $exists "should" work. If we indexed everything, and we queried ```{"foo": {"$exists": false}}```, then we would return  all the documents in the db that did not have "foo" as a field in the document. However, if you explicitly indexed "foo", then you would get 0 results back because you only indexed the subset of documents that contained "foo" as a field. The large (all_docs)superset is not part of the index, and therefore would not be returned. So _all_docs, explicit json index, index everything, and explicit text index would all return different results. 
 
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