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

From: Merlin Moncure <mmoncure(at)gmail(dot)com>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>
Cc: Pavel Stehule <pavel(dot)stehule(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 14:18:27
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Lists: pgsql-hackers
On Thu, May 3, 2012 at 9:01 AM, Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:
> 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.

would it work for array types?  can it called without using FROM?


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