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Re: How hard would it be to support LIKE in return declaration of generic record function calls ?

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Cc: Merlin Moncure <mmoncure(at)gmail(dot)com>, Hannu Krosing <hannu(at)2ndquadrant(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: How hard would it be to support LIKE in return declaration of generic record function calls ?
Date: 2012-05-03 14:01:27
Message-ID: 4FA28FB7.8070206@dunslane.net (view raw or flat)
Thread:
Lists: pgsql-hackers

On 05/03/2012 09:43 AM, Pavel Stehule wrote:
> 2012/5/3 Merlin Moncure<mmoncure(at)gmail(dot)com>:
>> On Thu, May 3, 2012 at 7:13 AM, Pavel Stehule<pavel(dot)stehule(at)gmail(dot)com>  wrote:
>>> Hello
>>>
>>>> (1 row)
>>>>
>>>> This works the same indeed, just seems to be a hack, though a cool
>>>> one :)
>> Yeah -- the syntax isn't great, but IMO it's more generally usable
>> than what you're proposing because it's a scalar returning function
>> not a table expression.  Another point is that the proposed 'like'
>> syntax (which I still think is great, just maybe not for conversions
>> from json) seems wedded to record types.  The hstore trick should be
>> able to take a foo[], set it all up and return it.  How would that
>> work with like?
>>
>>> few years back I proposed "anytypename" type
>>>
>>> with this feature, you can has some clean and more readable call
>>>
>>> SELECT * FROM populate_record(test, ...)
>> that would be great IMO.
> I'll try propose it again - implementation should not be hard
>
>

You guys seem to be taking the original proposal off into the weeds. I 
have often wanted to be able to use LIKE in type expressions, and I'd 
like to see exactly that implemented.

cheers

andrew

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