Re: rewrite HeapSatisfiesHOTAndKey

From: Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
Cc: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Pavan Deolasee <pavan(dot)deolasee(at)2ndquadrant(dot)com>
Subject: Re: rewrite HeapSatisfiesHOTAndKey
Date: 2017-01-02 03:58:28
Message-ID: CABOikdNuK1+FYxNx=KRQ48p+tH_J4SPa44VypaL_-+SqZm3TxA@mail.gmail.com
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On Mon, Jan 2, 2017 at 8:52 AM, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:

>
> I think there is some chance that such a change could induce
> regression for the cases when there are many index columns or I think
> even when index is on multiple columns (consider index is on first and
> eight column in a ten column table).
>
>
I don't see that as a problem because the routine only checks for columns
that are passed as "interesting_cols".

Noticed below comment in interesting-attrs-2.patch
> + * are considered the "key" of rows in the table, and columns that are
> + * part of indirect indexes.
>
> Is it right to mention about indirect indexes in above comment
> considering indirect indexes are still not part of core code?
>

I agree. We can add details about indirect indexes or WARM later, as and
when those patches get committed.

> Pavan, please rebase your WARM patch on top of this and let me know how
> you like it. I'll post a new version of indirect indexes later this
> week.
>
>
I've rebased WARM on top of this patch and the proposed changes look fine
from WARM's perspective too. I'll send rebased patches separately.

Thanks,
Pavan

--
Pavan Deolasee http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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