[GitHub] garrensmith opened a new pull request #1718: Perform explicit $exists:false on Index validation

[GitBox <gi...@apache.org>]

garrensmith opened a new pull request #1718: Perform explicit $exists:false on Index validation
URL: https://github.com/apache/couchdb/pull/1718
 
 
   ## Overview
   
   When selecting an index for a mango query, the mango index selector can incorrectly choose an index when a selector has an exists: false for a field in the index along with another condition for that same field. E.g:
   
   Index with fields = ["tags] and selector:
   
   ``` js
   Selector: {
       $or: [
         {
           tags: {
             $elemMatch: {
               $eq: "tag1"
             }
           }
         },
         {
           tags: { $exists: False }
         }
       ]
     }
   };
   ```
   
   In the above case, mango will select the index instead of falling back to `_all_docs`.
   
   ## Testing recommendations
   
   * Create similar queries like the above and make sure the index is not selected. 
   * All Mango tests should pass.
   
   ## Checklist
   
   - [x] Code is written and works correctly;
   - [x] Changes are covered by tests;
   - [ ] Documentation reflects the changes;
   

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