emit an $addFields stage before $sort with safe aliases if necessary#109

codedmart merged 2 commits intomainhasura/ndc-mongodb:mainfrom

jessehallett/eng-989-use-columnref-instead-of-safe_name-in-make_sorthasura/ndc-mongodb:jessehallett/eng-989-use-columnref-instead-of-safe_name-in-make_sortCopy head branch name to clipboard