| From: | Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com> |
|---|---|
| To: | Bhushan Uparkar <bhushan(dot)uparkar(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru> |
| Subject: | Re: Index Skip Scan |
| Date: | 2018-08-16 18:23:10 |
| Message-ID: | f020c7aa-b6f4-9a30-fcae-1a88cb3bb6f2@redhat.com |
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| Thread: | |
| Lists: | pgsql-hackers |
Hi Bhushan,
On 08/16/2018 01:44 AM, Bhushan Uparkar wrote:
> I was reviewing index-skip patch example and have a comment on it.
Thanks for your interest, and feedback on this patch !
> Example query “select distinct b from t1” is equivalent to “select b from t1 group by b”. When I tried the 2nd form > of query it came up with different plan, is it possible that index skip scan can address it as well?
>
Like Thomas commented down-thread my goal is to keep this contribution
as simple as possible in order to get to something that can be
committed. Improvements can follow in future CommitFests, which may end
up in the same release.
However, as stated in my original mail my goal is the simplest form of
Index Skip Scan (or whatever we call it). I welcome any help with the patch.
Best regards,
Jesper
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