In DBMSes like MySQL, MariaDB, PostgreSQL and MongoDB, data is saved as BSON, JSON or JSONB for JSON columns or document.
All of these data types use space for key names in JSON.
Does internal data on disk also require space for every key name on every row?
If yes, shouldn't a developer/admin care about it, for performance and storage cost reasons?
Is there any solution or are there any attempts to respond to these concerns?