Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1tPwmq-00GWpv-11 for pgsql-hackers@arkaria.postgresql.org; Tue, 24 Dec 2024 04:44:53 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1tPwmo-001XAi-Br for pgsql-hackers@arkaria.postgresql.org; Tue, 24 Dec 2024 04:44:50 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1tPwmn-001XAU-PG for pgsql-hackers@lists.postgresql.org; Tue, 24 Dec 2024 04:44:49 +0000 Received: from mail.postgrespro.ru ([93.174.131.139]) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1tPwmg-001KhA-1q for pgsql-hackers@lists.postgresql.org; Tue, 24 Dec 2024 04:44:48 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=postgrespro.ru; s=mx2023; t=1735015480; bh=IVrOcEzcwDKD5HjMSiqXwm6T2YaYVVpzhpB46DkmMPY=; h=Message-ID:Date:User-Agent:To:From:Subject:From; b=0X5c5+rAsGAc/6iz6gR9xPszai/RczvRaL4kUbHldhwpKfcvHMM7iAc4HqzbdeFY8 196EVEWxRA9Fz7Ab7LPc2zB7gDMvL2YKpA4XtgAejyiDByPYRkGrG4K71KlaH7z70Y ZRbjyQl7qayf7S5Kq3vDE39qJyJsv43/QkTAtU5+oJ4rU1SucIDhCfUx3MQOy3Hc57 udZZoP5hRO7UBBhS5Bf8gG7DqLrX9/sfPAEjQNqQSHBAKEKmKgd/VUYMb/dxZ4S+qa YDVUJptwrg9XgkASQzdc8GS99cxPFqyZUYgjxqmckWiC786BSU7MI700bIiyV8d4rB iiXSVjd3sxaHw== Received: from [172.20.10.4] (unknown [89.113.148.147]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (Client did not present a certificate) (Authenticated sender: a.rybakina@postgrespro.ru) by mail.postgrespro.ru (Postfix/587) with ESMTPSA id A85AD5FD88 for ; Tue, 24 Dec 2024 07:44:40 +0300 (MSK) Content-Type: multipart/mixed; boundary="------------RFr2OLQFP0DiOhNs0p4fFhBK" Message-ID: <0b1f670d-b39d-4966-bf32-f0d502ebc564@postgrespro.ru> Date: Tue, 24 Dec 2024 07:44:38 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: PostgreSQL Hackers From: Alena Rybakina Subject: Exists pull-up application with JoinExpr X-KSMG-AntiPhishing: NotDetected X-KSMG-AntiSpam-Interceptor-Info: not scanned X-KSMG-AntiSpam-Status: not scanned, disabled by settings X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.1.0.7854, bases: 2024/12/24 02:51:00 #26909592 X-KSMG-AntiVirus-Status: NotDetected, skipped X-KSMG-LinksScanning: not scanned, disabled by settings X-KSMG-Message-Action: skipped X-KSMG-Rule-ID: 1 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk This is a multi-part message in MIME format. --------------RFr2OLQFP0DiOhNs0p4fFhBK Content-Type: multipart/alternative; boundary="------------GSiAM2qoBQaB00e4p8Z9hQIp" --------------GSiAM2qoBQaB00e4p8Z9hQIp Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi, hackers! I found one pull-up that works if the inner join condition is written through the where condition, |create temp table ta (id int primary key, val int); insert into ta values(1,1); insert into ta values(2,2); ||insert into ta values(3,3);| |create temp table tb (id int primary key, aval int); insert into tb values(4,1); insert into tb values(5,1); insert into tb values(1,2); create temp table tc (id int primary key, aid int); insert into tc values(6,1); insert into tc values(7,2);| |EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT * FROM ta WHERE EXISTS (SELECT * FROM tb, tc WHERE ta.id = tb.id);| QUERY PLAN ------------------------------------------------------------------------- Nested Loop Semi Join (actual rows=1 loops=1) Buffers: local hit=6 -> Seq Scan on ta (actual rows=3 loops=1) Buffers: local hit=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) Buffers: local hit=1 Planning: Buffers: shared hit=67 read=12 (14 rows) but it doesn't work if it is written through the outside condition. |alena@postgres=# EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT * FROM ta WHERE EXISTS (SELECT * FROM tb JOIN tc ON ta.id = tb.id); QUERY PLAN ------------------------------------------------------ Seq Scan on ta (actual rows=1 loops=1) Filter: EXISTS(SubPlan 1) Rows Removed by Filter: 2 Buffers: local hit=5 SubPlan 1 -> Nested Loop (actual rows=0 loops=3) Buffers: local hit=4 -> Seq Scan on tb (actual rows=0 loops=3) Filter: (ta.id = id) Rows Removed by Filter: 3 Buffers: local hit=3 -> Seq Scan on tc (actual rows=1 loops=1) Buffers: local hit=1 Planning: Buffers: shared hit=16 read=9 (15 rows) | |I have written a patch to add this functionality and now it gives an query plan: | |alena@postgres=# EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)  SELECT *    FROM ta   WHERE EXISTS (SELECT *                   FROM tb JOIN tc                   ON ta.id = tb.id);                      QUERY PLAN -------------------------------------------------------------------------  Nested Loop Semi Join (actual rows=1 loops=1)    Buffers: local hit=6    ->  Seq Scan on ta (actual rows=3 loops=1)          Buffers: local hit=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)                Buffers: local hit=1 (12 rows)| tb and tc form a Cartesian product, but in the case of the intersection condition with tuples from the table ta (ta.id = tb.id). So, according to the join condition, tb intersects only with 1, and only it gets into the result, but at the same time they appear twice - this is because of the Cartesian product of tb with tc |*How it works:* | I rewrote the code a bit so that it considers not only the quals in jointree->quals, but also those in join expression (subselect->jointree->fromlist). If they satisfy the conditions for using pull up, I add them to the list of clauses and form a "Bool" expression from them, joined by an "AND" operation. -- Regards, Alena Rybakina Postgres Professional --------------GSiAM2qoBQaB00e4p8Z9hQIp Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hi, hackers!

I found one pull-up that works if the inner join condition is written through the where condition, 

create temp table ta (id int primary key, val int);
insert into ta values(1,1);
insert into ta values(2,2);
insert into ta values(3,3);

create temp table tb (id int primary key, aval int);
insert into tb values(4,1);
insert into tb values(5,1);
insert into tb values(1,2);

create temp table tc (id int primary key, aid int);
insert into tc values(6,1);
insert into tc values(7,2);

EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
 SELECT *
   FROM ta
  WHERE EXISTS (SELECT *
                  FROM tb, tc
                  WHERE ta.id = tb.id);
                               QUERY PLAN                                
-------------------------------------------------------------------------
 Nested Loop Semi Join (actual rows=1 loops=1)
   Buffers: local hit=6
   ->  Seq Scan on ta (actual rows=3 loops=1)
         Buffers: local hit=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)
               Buffers: local hit=1
 Planning:
   Buffers: shared hit=67 read=12
(14 rows)

but it doesn't work if it is written through the outside condition.

alena@postgres=# EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
 SELECT *
   FROM ta
  WHERE EXISTS (SELECT *
                  FROM tb JOIN tc
                  ON ta.id = tb.id);
                      QUERY PLAN                      
------------------------------------------------------
 Seq Scan on ta (actual rows=1 loops=1)
   Filter: EXISTS(SubPlan 1)
   Rows Removed by Filter: 2
   Buffers: local hit=5
   SubPlan 1
     ->  Nested Loop (actual rows=0 loops=3)
           Buffers: local hit=4
           ->  Seq Scan on tb (actual rows=0 loops=3)
                 Filter: (ta.id = id)
                 Rows Removed by Filter: 3
                 Buffers: local hit=3
           ->  Seq Scan on tc (actual rows=1 loops=1)
                 Buffers: local hit=1
 Planning:
   Buffers: shared hit=16 read=9
(15 rows)

I have written a patch to add this functionality and now it gives an query plan:

alena@postgres=# EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
 SELECT *
   FROM ta
  WHERE EXISTS (SELECT *
                  FROM tb JOIN tc
                  ON ta.id = tb.id);
                     QUERY PLAN                                
-------------------------------------------------------------------------
 Nested Loop Semi Join (actual rows=1 loops=1)
   Buffers: local hit=6
   ->  Seq Scan on ta (actual rows=3 loops=1)
         Buffers: local hit=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)
               Buffers: local hit=1
(12 rows)

tb and tc form a Cartesian product, but in the case of the intersection condition with tuples from the table ta (ta.id = tb.id). So, according to the join condition, tb intersects only with 1, and only it gets into the result, but at the same time they appear twice - this is because of the Cartesian product of tb with tc

How it works:

I rewrote the code a bit so that it considers not only the quals in jointree->quals, but also those in join expression (subselect->jointree->fromlist). If they satisfy the conditions for using pull up, I add them to the list of clauses and form a "Bool" expression from them, joined by an "AND" operation.

-- 

Regards, Alena Rybakina Postgres Professional

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