Added to TODO:
* Add GUC variable to allow output of interval values in ISO8601 format
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Tom Lane wrote:
> Ron Mayer <ron@cheapcomplexdevices.com> writes:
> > Would formatting functions for intervals such as...
> > to_iso8601basic_char(interval) -- return ISO-8601 basic fmt interval
> > to_iso8601basic_char(timestamp) -- return ISO-8601 basic fmt date/time
> > would be better than a new GUC variable?
>
> I could see arguments for both --- in the timestamp world we have
> DateStyle to control the default output format, plus to_char when you
> want something different. I'd suggest continuing with your plan of
> providing GUC control over the default interval format (just use a
> separate GUC variable, please, for orthogonality). If you want to add
> an explicit formatting function later, you can do that too.
>
> BTW, I do not recall exactly why Karel wants to deprecate
> to_char(interval), but I don't think it's because of any fundamental
> objection to the notion of a formatting function. I think it was
> because the present definition is badly designed and needs to be
> replaced with a different API.
>
> regards, tom lane
>
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