As an example? It is like the only thing that does it and it is so new that nobody has used it anywhere. It also looks like it just tries to map a document database back into a relational database implementation.
There are different types of indexes that mongo supports within a document that are more complex than what PostgreSQL can do. Or at least that is what I remember last time I checked.
I mean that this persons code is not production-ready. As in there is no chance it emulates all of the features of mongo or has been performance tested etc.
Err because things like this didn't even exist until 10 minutes ago and aren't production-ready. I don't really understand people who keep saying this. Postgresql supports JSON, but it doesn't have all of the code to go on top of it so that you can use it like mongo. As in, so you can do projects.find or projects.insert instead of a bunch of sql.
Then there are all kinds of other issues related indexes and the differences between mongo and PostgreSQL and so on.