Idea - fallback mode for psql backslash commands using information_schema

Hi!

I think I've got a nice TODO item for psql client:

When a client connects to a database which has unknown (newer)
version it might be advisable to 'fallback' some commands to use
INFORMATION_SCHEMA instead of system catalogs.

For instance when connected to 8.4dev server using 8.3 client,
after issuing \d foo_table you get:
ERROR: column "reltriggers" does not exist
LINE1: SELECT relhasindex, relkind, relchecks, reltriggers, relhasr....

Of course the information_schema will probably be less efficient
and won't have PostgreSQL-specific items like 'Has OIDs', but
the user experience should be better.

My question is: does it look like a good TODO item? :)

Best regards,
Dawid
--
.................. ``The essence of real creativity is a certain
: *Dawid Kuroczko* : playfulness, a flitting from idea to idea
: qnex42(at)gmail(dot)com : without getting bogged down by fixated demands.''
`..................' Sherkaner Underhill, A Deepness in the Sky, V. Vinge