distinct. Is this the correct behaviour?

Is this the way distinct is supposed to work? My intent is to give
only one for each different value of x - like it does in the first
distinct example. But when order by is added for the date/time sort
I get what you see in the second distinct example.

pop4=> select * from foo;
x|y
-+----------------------------
1|Wed Oct 20 06:29:41 1999 EDT
1|Wed Oct 20 06:29:42 1999 EDT
1|Wed Oct 20 06:29:43 1999 EDT
1|Wed Oct 20 06:29:48 1999 EDT
(4 rows)

pop4=> select distinct x from foo;
x
-
1
(1 row)

pop4=> select distinct x from foo order by y;
x
-
1
1
1
1
(4 rows)

Vince.
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