"Vilson farias" <vilson(dot)farias(at)digitro(dot)com(dot)br> writes:
> bxs=# select CAST('10:32:14.553243' AS interval(0));
> interval
> -----------------
> 10:32:14.553243
> (1 row)
This is a known bug in 7.3 and before --- it's fixed for 7.4.
regards, tom lane