Re: [HACKERS] Progress report: buffer refcount bugs and SQL functions

Tom Lane wrote:

>
> wieck@debis.com (Jan Wieck) writes:
> > Tom Lane wrote:
>
> What we really need to make functions-returning-sets work properly is
> an implementation somewhat like aggregate functions.  We need to make
> a list of all the Iter nodes present in a targetlist and cycle through
> the values returned by each in a methodical fashion (run the rightmost
> through its full cycle, then advance the next-to-rightmost one value,
> run the rightmost through its cycle again, etc etc).  Also there needs
> to be an understanding of the hierarchy when an Iter appears in the
> arguments of another Iter's function.  (You cycle the upper one for
> *each* set of arguments created by cycling its sub-Iters.)

    Shouldn't a function returning a SET of tuples cause a proper
    join?


Jan

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