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Re: Design: Escort info from WHERE clause to executor?

From: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
To: peter(dot)trautmeier(at)gmx(dot)de
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Design: Escort info from WHERE clause to executor?
Date: 2007-07-25 10:37:07
Message-ID: 46A727D3.9020909@enterprisedb.com (view raw or flat)
Thread:
Lists: pgsql-hackers
peter(dot)trautmeier(at)gmx(dot)de wrote:
> To sum up, I am looking for a (decently efficient) scheme that is able to
> 
> (1) pass arbitrary conditional expressions from WHERE to the executor in a structure preserving way. 
> (2) annotate arbitrary expressions with weights that survive on its way from the parser to the executor.
> (3) access the logical value of particular subexpressions.
> 
> I have some basic ideas how at least some of the requirements might be achieved. But as I am not totally satisfied with my ideas I hope you can provide me with some fresh input.

Why? What are you trying to achieve?

--
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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