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Message-ID: <7c7f40ae-dc26-4191-af3f-3277ab1c45a2@tantorlabs.com>
Date: Wed, 2 Apr 2025 12:35:33 +0300
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: Add estimated hit ratio to Memoize in EXPLAIN to explain cost
 adjustment
To: David Rowley <dgrowleyml@gmail.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>,
 Lukas Fittl <lukas@fittl.com>, Daniel Gustafsson <daniel@yesql.se>,
 PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 Nikolay Samokhvalov <samokhvalov@gmail.com>,
 Andrei Lepikhov <lepihov@gmail.com>
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Content-Language: en-US
From: Ilia Evdokimov <ilya.evdokimov@tantorlabs.com>
In-Reply-To: <CAApHDvpT0Y1BfYgeWz+PkKaLBEff1izYOAjNSibhBTNFEdqLtg@mail.gmail.com>
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On 02.04.2025 00:06, David Rowley wrote:
> I tried to move things along to address Tom's concern about not
> wanting to show this in EXPLAIN's standard output. I suggested in [1]
> that we could use EXPLAIN ANALYZE, but nobody commented on that.
> EXPLAIN ANALYZE is much more verbose than EXPLAIN already, and if we
> put these in EXPLAIN ANALYZE then the viewer can more easily compare
> planned vs actual. I had mentioned that Hash Join does something like
> this for buckets.
>
> David
>
> [1]https://postgr.es/m/CAApHDvqPkWmz1Lq23c9CD+mAW=hgPrD289tC30f3H1f6Ng59+g@mail.gmail.com


Apologies for not addressing your earlier suggestion properly. After 
reconsidering, I agree that showing ndistinct and est_entries in EXPLAIN 
ANALYZE when there are actual cache misses is the best approach. This is 
typically when users notice performance regressions and start 
investigating the cause, so surfacing planner expectations at that point 
can be the most useful. I attached v6 patch with changes.

--
Best regards,
Ilia Evdokimov,
Tantor Labs LLC.

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    <p><br>
    </p>
    <div class="moz-cite-prefix">On 02.04.2025 00:06, David Rowley
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAApHDvpT0Y1BfYgeWz+PkKaLBEff1izYOAjNSibhBTNFEdqLtg@mail.gmail.com"><span
      style="white-space: pre-wrap">
</span>
      <pre class="moz-quote-pre" wrap="">
I tried to move things along to address Tom's concern about not
wanting to show this in EXPLAIN's standard output. I suggested in [1]
that we could use EXPLAIN ANALYZE, but nobody commented on that.
EXPLAIN ANALYZE is much more verbose than EXPLAIN already, and if we
put these in EXPLAIN ANALYZE then the viewer can more easily compare
planned vs actual. I had mentioned that Hash Join does something like
this for buckets.

David

[1] <a class="moz-txt-link-freetext" href="https://postgr.es/m/CAApHDvqPkWmz1Lq23c9CD+mAW=hgPrD289tC30f3H1f6Ng59+g@mail.gmail.com">https://postgr.es/m/CAApHDvqPkWmz1Lq23c9CD+mAW=hgPrD289tC30f3H1f6Ng59+g@mail.gmail.com</a>
</pre>
    </blockquote>
    <p><br>
    </p>
    <p>Apologies for not addressing your earlier suggestion properly.
      After reconsidering, I agree that showing ndistinct and
      est_entries in EXPLAIN ANALYZE when there are actual cache misses
      is the best approach. This is typically when users notice
      performance regressions and start investigating the cause, so
      surfacing planner expectations at that point can be the most
      useful. I attached v6 patch with changes.</p>
    <p>--<br>
      Best regards,<br>
      Ilia Evdokimov,<br>
      Tantor Labs LLC.<br>
    </p>
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