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: | 2007-04-27 01:06:28 |
Message-ID: | 200704270106.l3R16Sa21032@momjian.us |
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Lists: | pgsql-patches |
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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
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--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://www.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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