I agree it's not worth the effort, just found it "interesting" (duh)
and hastily sent a bugreport before checking upstream.
[off]
Another interesting story was 7.3 silently discarding unneeded
typecasts: create a view with a field ('a' || 'b')::varchar. The same
definition worked in 7.3 and 7.4 (both created a varchar field), but
7.3 dropped the unneeded typecast, and when dumping from 7.3 to 7.4
all these fields became text. I think 7.3 was simply "too smart for
our dumb problems" :)
[/off]
On 5/20/05, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Neil Conway <neilc@samurai.com> writes:
> > Szűcs Gábor wrote:
> >> Check constraints:
> >> "foobar" CHECK ()
>
> > Yeah, I can repro this with current REL7_4_STABLE sources, but it looks
> > fixed in HEAD and REL8_0_STABLE.
>
> I think the reason is that 7.4 applies make_ands_implicit before storing
> the constraint, while 8.0 and up don't. I'm inclined to think it's not
> worth trying to fix in the back branches.
>
> regards, tom lane
>
--
G.