Re: pg_get_constraintdef failing with cache lookup error

Michael Paquier <michael.paquier@gmail.com> writes:
> pg_get_constraintdef() fails rather easily:
> =# select pg_get_constraintdef(1);
> ERROR:  cache lookup failed for constraint 1

It's expected that the caller will supply a valid pg_constraint OID.
I don't think it's necessary to go out of our way to throw a friendlier
error message if the OID isn't found.

            regards, tom lane