[GitHub] [couchdb] garbados opened a new issue, #4226: Document caveats around $allMatch, $elemMatch, etc.

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

garbados opened a new issue, #4226:
URL: https://github.com/apache/couchdb/issues/4226

   <!--- Provide a general summary of the issue in the Title above -->
   
   As documented in [another issue](https://github.com/apache/couchdb/issues/2236), some selectors incur performance costs [because they do not map to how views work](https://github.com/apache/couchdb/issues/2236#issuecomment-538928959). However, only `$regex` is identified as not functioning with indices. All such operators that incur these unexpected costs should be documented.
   
   ## Expected Behavior
   <!--- If you're describing a bug, tell us what should happen -->
   <!--- If you're suggesting a change/improvement, tell us how it should work -->
   
   Performance caveats for Mango operators are documented clearly.
   
   ## Current Behavior
   <!--- If describing a bug, tell us what happens instead of the expected behavior -->
   <!--- If suggesting a change/improvement, explain the difference from current behavior -->
   
   Performance caveats are only documented for `$regex`.
   


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