Re: PATCH: make plpgsql IN args mutable (v1) [REVIEW]

On Wed, Sep 16, 2009 at 8:59 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Sep 16, 2009, at 8:37 AM, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
>
>>
>>
>> Abhijit Menon-Sen wrote:
>>>
>>> At 2009-07-30 13:37:16 -0700, prentice(at)cisco(dot)com wrote:
>>>
>>>> This patch changes plpgsql IN parameters so they are mutable.
>>>>
>>>
>>> Makes sense, applies fine, works fine.
>>>
>>>
>>>
>>
>> How does this compare with PLSQL? I know in Ada an IN argument is in
>> effect a constant. I understand the utility, because I occasionally knock
>> against this restriction, but if it's incompatible with PLSQL I think we
>> should think about it more carefully.
>
> At worst it's an upward-compatible extension, or am I wrong?  If it's
> useful, which I think it is, what's the harm?

are we guarding against cases like:
select _foo, adjust_foo(_foo) from bar; -- adjust_foo is inout

??
merlin