Comment by rafaelgoncalves
1 month ago
on postgres I can update a field easily and atomically with transactions (or there is something I don't know about?), like (postgresql 14)[0]:
UPDATE users SET profile = profile || '{"lastname":"Washington"}' WHERE profile->>'name' = 'George Washington';
Nope. If two writes happen concurrently on different fields you'll lose one write, unless you lock. The storage layer just stores the data as a blob that gets overwritten every time, it doesn't support partial updates.
Of course it supports partial updates. It just requires you to know the difference between a document and a field, and model your data appropriately.