I wrote:
> One possibility is to forget all the parens and say that the display
> looks like
>       type1, type2 WITHIN GROUP type3, type4
> Please don't object that that doesn't look exactly like the syntax
> for calling the function, because it doesn't anyway --- remember you
> also need ORDER BY in the call.

Actually, now that I think of it, why not use this syntax for declaration
and display purposes:
        type1, type2 ORDER BY type3, type4
This has nearly as much relationship to the actual calling syntax as the
WITHIN GROUP proposal does, and it's hugely saner from a semantic
standpoint, because after all the ordering columns are ordering columns,
not grouping columns.

                        regards, tom lane

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