Re: Exposing quals

On Tue, Jul 08, 2008 at 06:22:23PM +0300, Heikki Linnakangas wrote:
> Simon Riggs wrote:
>> SQL, in text form, is the interface to other databases. You can't
>> pass half a plan tree to Oracle, especially not a PostgreSQL plan
>> tree. It has to be text if you wish to send a query to another
>> RDBMS, or another version of PostgreSQL.
>
> Oh, I see. Agreed.
>
> Though note that there's big differences in SQL dialects, so a
> one-size-fits-all approach to generating SQL to be executed in the
> remote database won't work. (not that I think anyone has suggested
> that)
>
>> So if I understand you, you want to pass the partial plan tree and
>> then have a plugin construct the SQL text.
>
> Exactly.
>
>> Maybe you thought I meant internal interfaces should be in text?
>
> Yeah, that's exactly what I thought you meant.
>
>> No, that would be bizarre. I meant we should not attempt to pass
>> partial plan trees outside of the database, since that would limit
>> the feature to only working with the same version of PostgreSQL
>> database.
>
> Agreed. I'm glad we're on the same page now.

Everybody's weighed in on this thread except the guy who's actually
doing the work.

Jan?

Cheers,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter
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