Re: BUG #16169: Default time output for 24:00 is 00:00

Francisco Olarte  writes:
> On Tue, Dec 17, 2019 at 7:18 PM Tom Lane  wrote:
>> Another theory is that the webpage is passing the output through some
>> type-aware reformatting ... that seems pretty weird though.

> I think it is that. http://sqlfiddle.com/#!17/9eecb/43349 == select
> '24:00'::time::text; returns "24:00:00".

Hmm ... yeah.  If you try similar experiments with interval or timestamp
values, or even just booleans, you get completely different results
depending on whether the exposed query result type is that or just text.
For instance

select now();

2019-12-17T20:59:28.701655Z

select now()::text;

2019-12-17 20:59:50.113717+00

There are a few cases where a cast-to-text in PG produces a different
string than the type's output function would, but that doesn't apply
here.  sqlfiddle's web page must be coercing the value into some
format they like better.

So that's something sqlfiddle.com really ought to document for
themselves.  (Maybe they do --- I've never poked around their
website in any detail.)

			regards, tom lane