Create and use db links in Mongodb
Allow Mongodb to access an external database for:
1.select identifiers on an external rdbms (ex: postgres, sqls, oracle, ...)
2.use these identifiers to perform aggregations in Mongodb
Currently, it is necessary to use a third-party tool that connects to several data sources to perform these actions.
The idea is to be able to perform these "joins" only in Mongodb CLI.