Aw: Additional accessors via the Extension API ? - Mailing list pgsql-general

> Suppose  I have defined an additional type in a PG extension.
>
> Is it possible to add custom accessors to that type -much like jsonb does- but use an API/hook without touching the
corePG grammar & parser?  
>
> Hypothetical Examples:
>
> Assuming I have a TextFile type I’d like to implement syntax like:
>
> (‘/home/me/a.txt’::TextFile).firstline
> (‘/home/me/a.txt’::TextFile).lastline
> (‘/home/me/a.txt’::TextFile).countlines()
> (‘/home/me/a.txt’::TextFile).size()
> (‘/home/me/a.txt’::TextFile).datemodified()

Off on a tangent but would file_fdw help in any way ?

Karsten