From: | Joe Conway <mail(at)joeconway(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | PostgreSQL Patches <pgsql-patches(at)postgresql(dot)org> |
Subject: | Re: [Fwd: SETOF input parameters (was Re: [HACKERS] proposal: |
Date: | 2002-12-30 01:18:08 |
Message-ID: | 3E0F9ED0.60404@joeconway.com |
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Lists: | pgsql-hackers pgsql-patches |
Tom Lane wrote:
> Joe Conway <mail(at)joeconway(dot)com> writes:
>
>>Tom Lane wrote:
>>
>>>Agreed. The Berkeley code (or more accurately, the descendant code
>>>that's in our source tree) generates the cross product of the rows
>>>output by the SRFs, but I've never understood why that should be a good
>>>approach to take. I could live with just rejecting multiple SRFs in the
>>>same targetlist --- at least till someone comes up with a convincing
>>>semantics for such a thing.
>
>
>>I would like to start spending some time digging in to this. Any pointers or
>>thoughts on the best way to implement it? A little direction might save me
>>days of wheel spinning :-).
>
>
> Implement what exactly?
Well, I want to allow a single table function (or srf if you prefer) in the
target list as discussed above.
Currently, when you try it, record_out() gets called from printtup() when the
srf is encountered, which generates an ERROR. The behavior in 7.2.x is to
return a pointer when the composite type is output. I think that to make this
work as discussed, the target list needs to be "expanded" for the composite
type (similar to expanding a "*" I would think), so I was starting to look at
transformTargetList() and ExpandAllTables().
>
> The code that presently does the dirty work is in ExecTargetList(), if
> that's what you're looking for...
>
OK -- i'll check that out too.
Thanks,
Joe
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