Re: variadic function support

2008/7/4 Simon Riggs <simon@2ndquadrant.com>:
>
> On Mon, 2008-06-23 at 15:13 +0200, Pavel Stehule wrote:
>
>> this patch enhance current syntax of CREATE FUNCTION statement. It
>> allows creating functions with variable number of arguments. This
>> version is different than last my patches. It doesn't need patching
>> PL. Basic idea is transformation of real arguments (related to
>> declared variadic argument) to array. All changes are mostly in
>> parser.
>
> Something for the TODO.
>
> An added thought with regard to variadic functions:
>
> when we have them, we should be able to parse/transform repeated
> operator sequences into a call to a variadic function, if it exists.
>
> e.g. w || x || y || z can be transformed into a call to
> concat_variadic(w, x, y, z)
>
> This can then be made to perform better than
>
> concat(concat(concat(w, x), y), z)
>
> which would involve lots of wasted memory copies.


good idea

Regards
Pavel Stehule
>
> --
>  Simon Riggs           www.2ndQuadrant.com
>  PostgreSQL Training, Services and Support
>
>