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Message-ID: <bea2a2ae-3a95-4740-8926-837bacc7bd4e@tantorlabs.com>
Date: Thu, 20 Mar 2025 11:47:56 +0300
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User-Agent: Mozilla Thunderbird
Subject: Re: Add estimated hit ratio to Memoize in EXPLAIN to explain cost
 adjustment
To: Lukas Fittl <lukas@fittl.com>, Daniel Gustafsson <daniel@yesql.se>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 David Rowley <dgrowleyml@gmail.com>
References: 
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From: Ilia Evdokimov <ilya.evdokimov@tantorlabs.com>
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On 06.07.2023 11:27, Lukas Fittl wrote:
> On Thu, Jul 6, 2023 at 12:56 AM Daniel Gustafsson <daniel@yesql.se> wrote:
>
>     Lukas: do you have an updated patch for this commitfest to address
>     David's
>     comments?
>
>
> I have a draft - I should be able to post an updated patch in the next 
> days. Thanks for checking!
>
> Thanks,
> Lukas
>
> -- 
> Lukas Fittl


Hi hackers,

While debugging a query execution plan involving Memoize, it'd be nice 
to determine how many unique keys would fit into the cache. The 
est_entries value provides some insight, but without knowing ndistinct, 
it is unclear whether the cache is large enough to hold all unique keys 
or if some will be evicted.

Given its potential usefulness, I would like to work for this. I 
attached v2 patch with changes.

Example from memoize.sql

EXPLAIN SELECT COUNT(*),AVG(t1.unique1) FROM tenk1 t1
INNER JOIN tenk1 t2 ON t1.unique1 = t2.thousand
WHERE t2.unique1 < 1200;
                                              QUERY PLAN
-----------------------------------------------------------------------------------------------------
  Aggregate  (cost=815.12..815.13 rows=1 width=40)
    ->  Nested Loop  (cost=0.30..809.12 rows=1200 width=4)
          ->  Seq Scan on tenk1 t2  (cost=0.00..470.00 rows=1200 width=4)
                Filter: (unique1 < 1200)
          ->  Memoize  (cost=0.30..0.41 rows=1 width=4)
                Cache Key: t2.thousand
                Cache Mode: logical
                Cache Estimated Entries: 655
                Cache Estimated NDistinct: 721
                ->  Index Only Scan using tenk1_unique1 on tenk1 t1  
(cost=0.29..0.40 rows=1 width=4)
                      Index Cond: (unique1 = t2.thousand)
(11 rows)

Additionally, since this information would only be shown in EXPLAIN when 
costs are enabled, it should not cause any performance regression in 
normal execution. However, reviewers should be especially careful when 
verifying test outputs, as this change could affect plan details in 
regression tests.

Any thoughts?

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

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    <p><br>
    </p>
    <div class="moz-cite-prefix">On 06.07.2023 11:27, Lukas Fittl wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAP53Pkz-sK8En2c05rJDcV7pz8+OsbNqOnm_SO4tsuwm=n=3OQ@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div dir="ltr">On Thu, Jul 6, 2023 at 12:56 AM Daniel Gustafsson
          &lt;<a href="mailto:daniel@yesql.se" moz-do-not-send="true"
            class="moz-txt-link-freetext">daniel@yesql.se</a>&gt; wrote:</div>
        <div class="gmail_quote">
          <blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
            Lukas: do you have an updated patch for this commitfest to
            address David's<br>
            comments?<br>
          </blockquote>
          <div><br>
          </div>
          <div>I have a draft - I should be able to post an updated
            patch in the next days. Thanks for checking!</div>
          <div><br>
          </div>
          <div>Thanks,</div>
          <div>Lukas</div>
        </div>
        <br>
        <span class="gmail_signature_prefix">-- </span><br>
        <div dir="ltr" class="gmail_signature">
          <div dir="ltr">
            <div>
              <div dir="ltr">
                <div>
                  <div dir="ltr">Lukas Fittl</div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    <p><br>
    </p>
    <p>Hi hackers,</p>
    <p>While debugging a query execution plan involving Memoize, it'd be
      nice to determine how many unique keys would fit into the cache.
      The est_entries value provides some insight, but without knowing
      ndistinct, it is unclear whether the cache is large enough to hold
      all unique keys or if some will be evicted.</p>
    <p>Given its potential usefulness, I would like to work for this. I
      attached v2 patch with changes.<br>
    </p>
    <p>Example from memoize.sql<br>
    </p>
    <p>EXPLAIN SELECT COUNT(*),AVG(t1.unique1) FROM tenk1 t1<br>
      INNER JOIN tenk1 t2 ON t1.unique1 = t2.thousand<br>
      WHERE t2.unique1 &lt; 1200;<br>
                                                   QUERY
      PLAN                                              <br>
-----------------------------------------------------------------------------------------------------<br>
       Aggregate  (cost=815.12..815.13 rows=1 width=40)<br>
         -&gt;  Nested Loop  (cost=0.30..809.12 rows=1200 width=4)<br>
               -&gt;  Seq Scan on tenk1 t2  (cost=0.00..470.00 rows=1200
      width=4)<br>
                     Filter: (unique1 &lt; 1200)<br>
               -&gt;  Memoize  (cost=0.30..0.41 rows=1 width=4)<br>
                     Cache Key: t2.thousand<br>
                     Cache Mode: logical<br>
                     Cache Estimated Entries: 655<br>
                     Cache Estimated NDistinct: 721<br>
                     -&gt;  Index Only Scan using tenk1_unique1 on tenk1
      t1  (cost=0.29..0.40 rows=1 width=4)<br>
                           Index Cond: (unique1 = t2.thousand)<br>
      (11 rows)<br>
    </p>
    <p>Additionally, since this information would only be shown in
      EXPLAIN when costs are enabled, it should not cause any
      performance regression in normal execution. However, reviewers
      should be especially careful when verifying test outputs, as this
      change could affect plan details in regression tests.</p>
    <p>Any thoughts?</p>
    <p>--<br>
      Best regards,<br>
      Ilia Evdokimov,<br>
      Tantor Labs LLC.<br>
    </p>
  </body>
</html>

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