The gem https://github.com/ankane/polars-ruby adds supports for Dataframes to Ruby. These are very useful for in-memory analytics on data, and are common in datascience.

It would be useful to investigate Mongoid's support for dataframes. For example:

• Add shortcut to output query results as a dataframe. In MONGOID-5411 there is a request to be able to specify Criteria output format something like:

User.where(name: "Bob").as(:json)

It would be useful to be able to do `as(:df)` as well.

• Consider how projection mapping only/except works with data frames (I haven't tested it.)