INTPYTHON-793: Push conditions into lookup when possible.#440

WaVEV wants to merge 2 commits intomongodb:mainmongodb/django-mongodb-backend:mainfrom

WaVEV:INTPYTHON-713-Push-conditions-into-lookupWaVEV/django-mongodb-backend:INTPYTHON-713-Push-conditions-into-lookupCopy head branch name to clipboard