[GitHub] [couchdb] pgj opened a new pull request, #4568: fix(`mango`): improve handling of unsatisfiable ranges in selectors

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

pgj opened a new pull request, #4568:
URL: https://github.com/apache/couchdb/pull/4568

   Certain configurations of unsatisfiable field ranges could cause HTTP 500 because they are not handled, for example:
   
   ```json
   {"$and": [{"field": {"$eq": N}}, {"field": {"$gt": N}}]}
   ```
   
   This makes `mango_idx_view:end_key/1` fail because there is no clause to cover `[{'$gt',35,'$eq',35}]`, the value that the selector becomes mapped to.
   
   Similar field ranges are somewhat already handled by being mapped to `empty` so this seems to be an oversight in the original implementation.  Consider the following case, which will not crash on the contrary:
   
   ```json
   {"$and": [{"field": {"$gt": N}}, {"field": {"$eq": N}}]}
   ```
   
   Add the missing function clauses to fix this problem.
   
   ## Checklist
   
   - [ ] Code is written and works correctly
   - [ ] Changes are covered by tests
   


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