Hi again,
> So all in all, -1. [...]
Here is something I would like to add:
1. As far as I know, "all the rest of DBMS have this" was never a good
argument in the PostgreSQL community. Generally, using it will turn people
against you.
2. I recall there was a proposal of making the SQL syntax itself
extendable. To my knowledge, this is still a wanted feature [1]. In theory,
that would allow you to implement the feature you want in an extension.
[1]: https://wiki.postgresql.org/wiki/Todo#Exotic_Features
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Best regards,
Aleksander Alekseev