fix selecting nested field with name that begins with dollar sign#108

hallettj merged 6 commits intomainhasura/ndc-mongodb:mainfrom

jessehallett/eng-1129-mongodb-selecting-nested-field-with-dollar-sign-in-namehasura/ndc-mongodb:jessehallett/eng-1129-mongodb-selecting-nested-field-with-dollar-sign-in-nameCopy head branch name to clipboard