Skip site navigation (1) Skip section navigation (2)

Re: UPDATE using sub selects

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: NikhilS <nikkhils(at)gmail(dot)com>
Cc: pgsql-patches(at)postgresql(dot)org
Subject: Re: UPDATE using sub selects
Date: 2008-03-18 14:58:05
Message-ID: 200803181458.m2IEw5419179@momjian.us (view raw or flat)
Thread:
Lists: pgsql-patches
Patch removed from patch queue --- NikhilS, please resubmit when you are
ready.  Thanks.

---------------------------------------------------------------------------

NikhilS wrote:
> Hi,
> 
> As per discussion on -hackers, a patch which allows updates to use
> subselects is attached with this mail.
> 
> As per discussion with Tom, I have adopted the following approach:
> 
> * Introduce ROWEXPR_SUBLINK type for subqueries that allows multiple column
> outputs.
> * Populate the targetList with PARAM_SUBLINK entries dependent on the
> subselects.
> * Modify the targets in-place into PARAM_EXEC entries in the make_subplan
> phase.
> 
> The above does not require any kluges in the targetList processing code path
> at all.
> 
> UPDATEs seem to work fine using subselects with this patch. I have modified
> the update.sql regression test to include possible variations .
> 
> No documentation changes are present in this patch.
> Feedback, comments appreciated.
> 
> Regards,
> Nikhils
> -- 
> EnterpriseDB               http://www.enterprisedb.com

[ Attachment, skipping... ]

> 
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Have you searched our list archives?
> 
>                http://archives.postgresql.org

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://postgres.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

In response to

pgsql-patches by date

Next:From: Josh BerkusDate: 2008-03-18 15:43:45
Subject: Re: [0/4] Proposal of SE-PostgreSQL patches
Previous:From: NikhilSDate: 2008-03-18 07:48:19
Subject: Re: UPDATE using sub selects

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group