| From: | Moshe Jacobson <moshe(at)neadwerx(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-bugs(at)postgresql(dot)org, Robert Mowlavi <robert(at)neadwerx(dot)com>, Chris Autry <chris(at)neadwerx(dot)com> |
| Subject: | Re: LEFT JOINs not optimized away when not needed |
| Date: | 2014-07-08 20:44:39 |
| Message-ID: | CAJ4CxLkYMm6wV-5yhGtRVXOHsP-9CkXafhsT=+2D6-9dkMueiA@mail.gmail.com |
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| Lists: | pgsql-bugs pgsql-hackers |
On Tue, Jul 8, 2014 at 4:40 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> No. There is nothing about GROUP BY in the join removal logic.
>
OK. Thank you. Is this something that would make sense to add?
More importantly, do you have any suggestions on how we can improve the
speed of our views when only a couple of columns are selected from them?
Moshe Jacobson
Manager of Systems Engineering, Nead Werx Inc. <http://www.neadwerx.com>
2323 Cumberland Parkway · Suite 201 · Atlanta, GA 30339
"Quality is not an act, it is a habit." -- Aristotle
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