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Date: Mon, 13 Jan 2025 20:19:42 +0300
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Subject: Re: Exists pull-up application with JoinExpr
From: Alena Rybakina <a.rybakina@postgrespro.ru>
To: Ilia Evdokimov <ilya.evdokimov@tantorlabs.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 Ranier Vilela <ranier.vf@gmail.com>
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Hi! I have solved it.

On 30.12.2024 11:24, Alena Rybakina wrote:
>
> Hi! Thank you for your interest to this subject!
>
> On 27.12.2024 15:53, Ilia Evdokimov wrote:
>> Hi Alena,
>>
>> Thank you for your work on subqueries with JOIN.
>>
>> Have you considered the scenario where in subquery includes a qual 
>> like (tc.aid = 1)? When I tried executing those queries I receive 
>> different results. In my opinion, to prevent this, we should add 
>> filters for such quals within the loop 'foreach (lc, all_clauses)'
>>
>> EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT * FROM ta
>> WHERE EXISTS (SELECT * FROM tb, tc WHERE ta.id = tb.id AND tc.aid = 1);
>>                               QUERY PLAN
>> ----------------------------------------------------------------------
>>  Hash Join (actual rows=1 loops=1)
>>    Hash Cond: (ta.id = tb.id)
>>    Buffers: local hit=3
>>    ->  Seq Scan on ta (actual rows=3 loops=1)
>>          Buffers: local hit=1
>>    ->  Hash (actual rows=3 loops=1)
>>          Buckets: 4096  Batches: 1  Memory Usage: 33kB
>>          Buffers: local hit=2
>>          ->  HashAggregate (actual rows=3 loops=1)
>>                Group Key: tb.id
>>                Batches: 1  Memory Usage: 121kB
>>                Buffers: local hit=2
>>                ->  Nested Loop (actual rows=3 loops=1)
>>                      Buffers: local hit=2
>>                      ->  Seq Scan on tb (actual rows=3 loops=1)
>>                            Buffers: local hit=1
>>                      ->  Materialize (actual rows=1 loops=3)
>>                            Storage: Memory  Maximum Storage: 17kB
>>                            Buffers: local hit=1
>>                            ->  Seq Scan on tc (actual rows=1 loops=1)
>>                                  Filter: (aid = 1)
>>                                  Rows Removed by Filter: 1
>>                                  Buffers: local hit=1
>> (23 rows)
>>
>> ============================
>>
>> EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
>> SELECT * FROM ta WHERE EXISTS (SELECT * FROM tb JOIN tc ON ta.id =
>> tb.id WHERE tc.aid = 1);
>>                                 QUERY PLAN
>> --------------------------------------------------------------------------- 
>>
>>  Seq Scan on ta (actual rows=1 loops=1)
>>    Filter: EXISTS(SubPlan 1)
>>    Rows Removed by Filter: 2
>>    Buffers: local hit=6
>>    SubPlan 1
>>      ->  Nested Loop (actual rows=0 loops=3)
>>            Buffers: local hit=5
>>            ->  Index Only Scan using tb_pkey on tb (actual rows=0 
>> loops=3)
>>                  Index Cond: (id = ta.id)
>>                  Heap Fetches: 1
>>                  Buffers: local hit=4
>>            ->  Seq Scan on tc (actual rows=1 loops=1)
>>                  Filter: (aid = 1)
>>                  Buffers: local hit=1
>> (14 rows)
>>
>>
> You are right, at the moment the code is not processed if there is a 
> constant qual in the subquery (like t1.x1=1 in the example below) and 
> this problem is not only related to the current patch.
>
> For example you can get such a query plan if you complete this request 
> to the master:
>
> create table t (xint);
> create table t1 (x1int);
> create table t2 (x2int);
>   EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
>   SELECT 1
>     FROM t
>    WHERE EXISTS (SELECT 1
>                    FROM t1
>                    where t1.x1 = 1);
>                     QUERY PLAN
> ------------------------------------------------
>   Result (actual rows=0 loops=1)
>     One-Time Filter: (InitPlan 1).col1
>     InitPlan 1
>       ->  Seq Scan on t1 (actual rows=0 loops=1)
>             Filter: (x1 = 1)
>     ->  Seq Scan on t (never executed)
> (6 rows)
>
> It's all because of the check in this function - this qual has 
> levelsoup = 0, not 1 (see (!contain_vars_of_level(whereClause, 1)), 
> but I already found out that by changing this, the logic of correction 
> there is required a little more complicated. At the moment, I'm 
> working to add this processing to the patch.
>
> Thanks for the case!
>
The logic is the same, but extended to constants. I added a few more 
tests that not only cover this case, but also NOT EXISTS, which will be 
converted to ANTI JOIN.

-- 
Regards,
Alena Rybakina
Postgres Professional

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    <p>Hi! I have solved it. <br>
    </p>
    <div class="moz-cite-prefix">On 30.12.2024 11:24, Alena Rybakina
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:8d7cbbf6-ddc0-4696-8af2-a68d740e14f2@postgrespro.ru">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <p>Hi! Thank you for your interest to this subject!<br>
      </p>
      <div class="moz-cite-prefix">On 27.12.2024 15:53, Ilia Evdokimov
        wrote:<br>
      </div>
      <blockquote type="cite"
        cite="mid:9b041978-06e3-4a50-8a5d-dacbb054f23e@tantorlabs.com">Hi
        Alena, <br>
        <br>
        Thank you for your work on subqueries with JOIN. <br>
        <br>
        Have you considered the scenario where in subquery includes a
        qual like (tc.aid = 1)? When I tried executing those queries I
        receive different results. In my opinion, to prevent this, we
        should add filters for such quals within the loop 'foreach (lc,
        all_clauses)' <br>
        <br>
        EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT *
        FROM ta <br>
        WHERE EXISTS (SELECT * FROM tb, tc WHERE ta.id = tb.id AND
        tc.aid = 1); <br>
                                      QUERY PLAN <br>
---------------------------------------------------------------------- <br>
         Hash Join (actual rows=1 loops=1) <br>
           Hash Cond: (ta.id = tb.id) <br>
           Buffers: local hit=3 <br>
           -&gt;  Seq Scan on ta (actual rows=3 loops=1) <br>
                 Buffers: local hit=1 <br>
           -&gt;  Hash (actual rows=3 loops=1) <br>
                 Buckets: 4096  Batches: 1  Memory Usage: 33kB <br>
                 Buffers: local hit=2 <br>
                 -&gt;  HashAggregate (actual rows=3 loops=1) <br>
                       Group Key: tb.id <br>
                       Batches: 1  Memory Usage: 121kB <br>
                       Buffers: local hit=2 <br>
                       -&gt;  Nested Loop (actual rows=3 loops=1) <br>
                             Buffers: local hit=2 <br>
                             -&gt;  Seq Scan on tb (actual rows=3
        loops=1) <br>
                                   Buffers: local hit=1 <br>
                             -&gt;  Materialize (actual rows=1 loops=3)
        <br>
                                   Storage: Memory  Maximum Storage:
        17kB <br>
                                   Buffers: local hit=1 <br>
                                   -&gt;  Seq Scan on tc (actual rows=1
        loops=1) <br>
                                         Filter: (aid = 1) <br>
                                         Rows Removed by Filter: 1 <br>
                                         Buffers: local hit=1 <br>
        (23 rows) <br>
        <br>
        ============================ <br>
        <br>
        EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) <br>
        SELECT * FROM ta WHERE EXISTS (SELECT * FROM tb JOIN tc ON ta.id
        = <br>
        tb.id WHERE tc.aid = 1); <br>
                                        QUERY PLAN <br>
---------------------------------------------------------------------------
        <br>
         Seq Scan on ta (actual rows=1 loops=1) <br>
           Filter: EXISTS(SubPlan 1) <br>
           Rows Removed by Filter: 2 <br>
           Buffers: local hit=6 <br>
           SubPlan 1 <br>
             -&gt;  Nested Loop (actual rows=0 loops=3) <br>
                   Buffers: local hit=5 <br>
                   -&gt;  Index Only Scan using tb_pkey on tb (actual
        rows=0 loops=3) <br>
                         Index Cond: (id = ta.id) <br>
                         Heap Fetches: 1 <br>
                         Buffers: local hit=4 <br>
                   -&gt;  Seq Scan on tc (actual rows=1 loops=1) <br>
                         Filter: (aid = 1) <br>
                         Buffers: local hit=1 <br>
        (14 rows) <br>
        <br>
        <br>
      </blockquote>
      <p>You are right, at the moment the code is not processed if there
        is a constant qual in the subquery (like t1.x1=1 in the example
        below) and this problem is not only related to the current
        patch. </p>
      <p>For example you can get such a query plan if you complete this
        request to the master:<br>
      </p>
      <pre class="code-java"
style="margin: 0px; padding: 0px; max-height: 30em; overflow: auto; white-space: pre-wrap; overflow-wrap: normal; color: rgb(23, 43, 77); font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(244, 245, 247); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">create table t (x <span
      class="code-object"
      style="color: var(--ds-text-accent-blue-bolder, #000091);">int</span>);
create table t1 (x1 <span class="code-object"
      style="color: var(--ds-text-accent-blue-bolder, #000091);">int</span>);
create table t2 (x2 <span class="code-object"
      style="color: var(--ds-text-accent-blue-bolder, #000091);">int</span>);
 EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
 SELECT 1
   FROM t
  WHERE EXISTS (SELECT 1
                  FROM t1
                  where t1.x1 = 1);
                   QUERY PLAN                   
------------------------------------------------
 Result (actual rows=0 loops=1)
   One-Time Filter: (InitPlan 1).col1
   InitPlan 1
     -&gt;  Seq Scan on t1 (actual rows=0 loops=1)
           Filter: (x1 = 1)
   -&gt;  Seq Scan on t (never executed)
(6 rows)</pre>
      <p>It's all because of the check in this function - this qual has
        levelsoup = 0, not 1 (see (!contain_vars_of_level(whereClause,
        1)), but I already found out that by changing this, the logic of
        correction there is required a little more complicated. At the
        moment, I'm working to add this processing to the patch. </p>
      <p>Thanks for the case!<br>
      </p>
      <pre class="moz-signature" cols="72">
</pre>
    </blockquote>
    The logic is the same, but extended to constants. I added a few more
    tests that not only cover this case, but also NOT EXISTS, which will
    be converted to ANTI JOIN.<br>
    <pre class="moz-signature" cols="72">-- 
Regards,
Alena Rybakina
Postgres Professional</pre>
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