Re: interval type additional option

čt 31. 1. 2019 v 15:33 odesílatel Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>
napsal:

> >>>>> "Pavel" == Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
>
> Pavel> Hi
> Pavel> I have a value '400 days 30 sec':: interval
>
> Pavel> I don't understand why cast
>
> Pavel> postgres=# select '400days 30sec'::interval minute to second;
>
> ...
>
> Pavel> What is sense of this feature?
>
> As far as I know it only exists because of the sql spec, and the
> implementation has never been complete or working. I think it does
> affect some input parsing cases, there are some nasty hacks here and
> there to support it, but given that our intervals don't behave like the
> spec's ones anyway, there seems to be little motivation to make it work
> fully.
>

yes - it looks little bit bizarre

>
> These work, for example:
>
> select interval '4' year to month; -- 4 months
> select interval '4' hour; -- 4 hours
> select interval '4' hour to second; -- 4 seconds
> select '4'::interval year to month; -- 4 months
> etc.
>
>
thank you for info

Pavel

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>