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Subject: Re: Re: WIP: Covering + unique indexes.
To: Anastasia Lubennikova <a.lubennikova@postgrespro.ru>
Cc: Alexander Korotkov <a.korotkov@postgrespro.ru>,
 Peter Geoghegan <pg@bowt.ie>, Thomas Munro <thomas.munro@enterprisedb.com>,
 Andrey Borodin <x4mmm@yandex-team.ru>,
 PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 Anastasia Lubennikova <lubennikovaav@gmail.com>
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From: David Steele <david@pgmasters.net>
Message-ID: <d237cf3d-a8a6-b031-aea4-ca9fc7fa093d@pgmasters.net>
Date: Mon, 26 Mar 2018 09:42:08 -0400
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On 3/26/18 6:10 AM, Alexander Korotkov wrote:
> 
> So, as I get you're proposing to introduce INDEX_ALT_TID_MASK flag
> which would indicate that we're storing something special in the t_tid
> offset.  And that should help us not only for covering indexes, but also for
> further btree enhancements including suffix truncation.  What exactly do
> you propose to store into t_tid offset when INDEX_ALT_TID_MASK flag
> is set?  Is it number of attributes in this particular index tuple?

It appears that discussion and review of this patch is ongoing so it
should not be marked Ready for Committer.  I have changed it to Waiting
on Author since there are several pending reviews and at least one bug.

Regards,
-- 
-David
david@pgmasters.net