[GitHub] willholley opened a new issue #138: Package should prefer _selector filters over JavaScript filter functions

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

willholley opened a new issue #138: Package should prefer _selector filters over JavaScript filter functions
URL: https://github.com/apache/incubator-openwhisk-package-cloudant/issues/138
 
 
   Cloudant / CouchDB has supported using Query selectors as an [alternative to JavaScript filter functions](http://docs.couchdb.org/en/2.0.0/api/database/changes.html#selector) for over a year.  Query selectors have a significant performance advantage over using JavaScript filters - they can be roughly an order of magnitude more efficient - and do not require users to inject a design document prior to reading changes.
   
   The OpenWhisk package should strongly push users towards using Query selectors in favour of JS functions. Essentially the changes would be:
   
   * use `filter=_selector` instead of asking users to specify a design doc/filter
   * make a `POST` request to `_changes` instead of `GET`
   * in the request body, include a `"selector"` field containing the Query selector to match documents against.

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