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 1tQ27t-00HBNe-PR for pgsql-hackers@arkaria.postgresql.org; Tue, 24 Dec 2024 10:26:58 +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 1tQ26t-0044Cq-UY for pgsql-hackers@arkaria.postgresql.org; Tue, 24 Dec 2024 10:25:55 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1tQ26t-0044Ch-As for pgsql-hackers@lists.postgresql.org; Tue, 24 Dec 2024 10:25:55 +0000 Received: from mail-pj1-x102c.google.com ([2607:f8b0:4864:20::102c]) by makus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.96) (envelope-from ) id 1tQ26l-000KOJ-2d for pgsql-hackers@lists.postgresql.org; Tue, 24 Dec 2024 10:25:54 +0000 Received: by mail-pj1-x102c.google.com with SMTP id 98e67ed59e1d1-2f43da61ba9so4383145a91.2 for ; Tue, 24 Dec 2024 02:25:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1735035947; x=1735640747; darn=lists.postgresql.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=XZINT4QO/JZ4Knz8EmwhCUo6fVMCZW7PDPDta+4Su8U=; b=iRgGh6sfmxGq7H6f3EMVdt/5atpPO5imSaOy4tXCfnRT7BiZS6iSUKoYQvrFDvupjA JpT+Aq5kFFLd4mqLYdY/1bLMybzD41KL6u/PYCG2RhcSI+GmBI85oiryrtVm/qM2wfpI sBacrLLvCje2BE7VM9yu7EsnsXUP+RADB8DDIp9udeeHdSrK5+klJreDrzONeuum5b+Q pCVvdUc+aQcNFzZZ3Ub6JJtD6NQYF9pQDyxzZi6qp+g/CkzUXVVvr05a/RuL9aOvkXde c76eWYJkhp4olNSeX3j1KHlsqKBhaHFnsdTpsqVMzcrcRzUyfyl241xt5/6vJWdMl8l3 GYBw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1735035947; x=1735640747; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=XZINT4QO/JZ4Knz8EmwhCUo6fVMCZW7PDPDta+4Su8U=; b=mUt7gKZ5PQTNuN7jFiZ4pnGJdkLhfBNtGQwNNlyKuJ9kM6Ioyf4uUvug4w8XQBI3d7 4ylCIjWP0H5U12Bw6CNHpvMsXjxkikJkv/KMnT1fnhfGtjHLuI5nxl9R2/pWTdfFMARC jHPc5p4arF8z7zaL+S7AQhmePAguiateQUPYS3IayPvG9kXDynCFw9Lg3HT4CvBDUHwU AesXW1xBLUIlZvIKxsSIuYwetYLVl5j06kHpBAA8DJtDCupZFaJAdJb18Jd/0GWfCAi7 6QzVCwyFfgDBaqjfrwIOtRWKKTIO8YLmlC/WZgDYbcfdFuOX4ZKYxS9MXaFMrc7S9o/8 CJrg== X-Gm-Message-State: AOJu0YzZVSqfiM5zJLQrqZ88dgAEgU1lhGooQQSc3dqjkjAM22eJkRTp xrVK2m3ajWlANz6RU96DFDv+YpAkV0lmhFcXhvQbhBpQaizBwCEH6Vz8oeLtHlmFQoGVLO9Uxs+ GRtxSO8uSUqWuP5bFVFCPeZQCOikvdqoc X-Gm-Gg: ASbGnctj0Z46lnKodyPfAHIIzjicgrq/K/fKmz4YVlsZ4SWjEPHraN2mFdipRDss+/m eYuSooUelhOqOQVJLHbn62mRdbeFNorWgH/LGCHPg65vNVt+bs2WDobZXPPNqScFCibeSz4A= X-Google-Smtp-Source: AGHT+IFLuBjt4PDoCRnBBeDCGm5TocWdA0QpqzZGKBYxGjynZiHorHXHfVH0OsRA+mH4hSYCAM6xSN74PQnwIuvwH9E= X-Received: by 2002:a17:90a:da8e:b0:2ee:f80c:688d with SMTP id 98e67ed59e1d1-2f452ec37a0mr21822228a91.25.1735035946625; Tue, 24 Dec 2024 02:25:46 -0800 (PST) MIME-Version: 1.0 References: <0b1f670d-b39d-4966-bf32-f0d502ebc564@postgrespro.ru> In-Reply-To: <0b1f670d-b39d-4966-bf32-f0d502ebc564@postgrespro.ru> From: Ranier Vilela Date: Tue, 24 Dec 2024 07:25:37 -0300 Message-ID: Subject: Re: Exists pull-up application with JoinExpr To: Alena Rybakina Cc: PostgreSQL Hackers Content-Type: multipart/mixed; boundary="000000000000459143062a01896b" List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk --000000000000459143062a01896b Content-Type: multipart/alternative; boundary="000000000000459142062a018969" --000000000000459142062a018969 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Alena. Em ter., 24 de dez. de 2024 =C3=A0s 01:44, Alena Rybakina < a.rybakina@postgrespro.ru> escreveu: > 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 =3D tb.id); > QUERY PLAN > ------------------------------------------------------------------------- > Nested Loop Semi Join (actual rows=3D1 loops=3D1) > Buffers: local hit=3D6 > -> Seq Scan on ta (actual rows=3D3 loops=3D1) > Buffers: local hit=3D1 > -> Nested Loop (actual rows=3D0 loops=3D3) > Buffers: local hit=3D5 > -> Index Only Scan using tb_pkey on tb (actual rows=3D0 loops= =3D3) > Index Cond: (id =3D ta.id) > Heap Fetches: 1 > Buffers: local hit=3D4 > -> Seq Scan on tc (actual rows=3D1 loops=3D1) > Buffers: local hit=3D1 > Planning: > Buffers: shared hit=3D67 read=3D12 > (14 rows) > > but it doesn't work if it is written through the outside condition. > > alena@postgres=3D# EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) > SELECT * > FROM ta > WHERE EXISTS (SELECT * > FROM tb JOIN tc > ON ta.id =3D tb.id); > QUERY PLAN > ------------------------------------------------------ > Seq Scan on ta (actual rows=3D1 loops=3D1) > Filter: EXISTS(SubPlan 1) > Rows Removed by Filter: 2 > Buffers: local hit=3D5 > SubPlan 1 > -> Nested Loop (actual rows=3D0 loops=3D3) > Buffers: local hit=3D4 > -> Seq Scan on tb (actual rows=3D0 loops=3D3) > Filter: (ta.id =3D id) > Rows Removed by Filter: 3 > Buffers: local hit=3D3 > -> Seq Scan on tc (actual rows=3D1 loops=3D1) > Buffers: local hit=3D1 > Planning: > Buffers: shared hit=3D16 read=3D9 > (15 rows) > > > I have written a patch to add this functionality and now it gives an quer= y > plan: > > alena@postgres=3D# EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) > SELECT * > FROM ta > WHERE EXISTS (SELECT * > FROM tb JOIN tc > ON ta.id =3D tb.id); > QUERY PLAN > ------------------------------------------------------------------------- > Nested Loop Semi Join (actual rows=3D1 loops=3D1) > Buffers: local hit=3D6 > -> Seq Scan on ta (actual rows=3D3 loops=3D1) > Buffers: local hit=3D1 > -> Nested Loop (actual rows=3D0 loops=3D3) > Buffers: local hit=3D5 > -> Index Only Scan using tb_pkey on tb (actual rows=3D0 loops= =3D3) > Index Cond: (id =3D ta.id) > Heap Fetches: 1 > Buffers: local hit=3D4 > -> Seq Scan on tc (actual rows=3D1 loops=3D1) > Buffers: local hit=3D1 > (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 =3D 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. > I took a look at this patch and I did a little polishing on it. And I believe that in testing, you need to set it to BUFFERS OFF, because of the recent change made to ANALYZE. The tests are failing, like this: QUERY PLAN ------------------------------------------------------------------------- Nested Loop Semi Join (actual rows=3D2 loops=3D1) + Buffers: local hit=3D7 -> Seq Scan on ta (actual rows=3D2 loops=3D1) + Buffers: local hit=3D1 -> Nested Loop (actual rows=3D1 loops=3D2) + Buffers: local hit=3D6 -> Index Only Scan using tb_pkey on tb (actual rows=3D1 loops=3D2) Index Cond: (id =3D ta.id) Heap Fetches: 2 + Buffers: local hit=3D4 -> Seq Scan on tc (actual rows=3D1 loops=3D2) -(7 rows) + Buffers: local hit=3D2 +(12 rows) best regards, Ranier Vilela --000000000000459142062a018969 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Alena.

Em ter., 24 de dez= . de 2024 =C3=A0s 01:44, Alena Rybakina <a.rybakina@postgrespro.ru> escreveu:
=20 =20 =20

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 prima=
ry 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, SUMMA=
RY OFF, TIMING OFF)
 SELECT *
   FROM ta
  WHERE EXISTS (SELECT *
                  FROM tb, tc
                  WHERE ta.id =3D tb.id);
                               QUERY PLAN                               =20
-------------------------------------------------------------------------
 Nested Loop Semi Join (actual rows=3D1 loops=3D1)
   Buffers: local hit=3D6
   ->  Seq Scan on ta (actual rows=3D3 loops=3D1)
         Buffers: local hit=3D1
   ->  Nested Loop (actual rows=3D0 loops=3D3)
         Buffers: local hit=3D5
         ->  Index Only Scan using tb_pkey on tb (actual rows=3D0 loops=
=3D3)
               Index Cond: (id =3D ta.id)
               Heap Fetches: 1
               Buffers: local hit=3D4
         ->  Seq Scan on tc (actual rows=3D1 loops=3D1)
               Buffers: local hit=3D1
 Planning:
   Buffers: shared hit=3D67 read=3D12
(14 rows)

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

alena@postgres=3D# EXPLAIN (ANALYZ=
E, COSTS OFF, SUMMARY OFF, TIMING OFF)
 SELECT *
   FROM ta
  WHERE EXISTS (SELECT *
                  FROM tb JOIN tc
                  ON ta.id =
=3D tb.id);
                      QUERY PLAN                     =20
------------------------------------------------------
 Seq Scan on ta (actual rows=3D1 loops=3D1)
   Filter: EXISTS(SubPlan 1)
   Rows Removed by Filter: 2
   Buffers: local hit=3D5
   SubPlan 1
     ->  Nested Loop (actual rows=3D0 loops=3D3)
           Buffers: local hit=3D4
           ->  Seq Scan on tb (actual rows=3D0 loops=3D3)
                 Filter: (ta.id<=
/a> =3D id)
                 Rows Removed by Filter: 3
                 Buffers: local hit=3D3
           ->  Seq Scan on tc (actual rows=3D1 loops=3D1)
                 Buffers: local hit=3D1
 Planning:
   Buffers: shared hit=3D16 read=3D9
(15 rows)

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

alena@postgres=3D# EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
=C2=A0SELECT *
=C2=A0=C2=A0 FROM ta
=C2=A0 WHERE EXISTS (SELECT *
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 FROM tb JOIN tc
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ON ta.id =3D tb.id); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 QUERY PLAN=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 =C2=A0
------------------------------------------------------------------------- =C2=A0Nested Loop Semi Join (actual rows=3D1 loops=3D1)
=C2=A0=C2=A0 Buffers: local hit=3D6
=C2=A0=C2=A0 ->=C2=A0 Seq Scan on ta (actual rows=3D3 loops=3D1) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Buffers: local hit= =3D1
=C2=A0=C2=A0 ->=C2=A0 Nested Loop (actual rows=3D0 loops=3D3)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Buffers: local hit= =3D5
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ->=C2=A0 Index On= ly Scan using tb_pkey on tb (actual rows=3D0 loops=3D3)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 Index Cond: (id =3D ta.id)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 Heap Fetches: 1
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 Buffers: local hit=3D4
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ->=C2=A0 Seq Scan= on tc (actual rows=3D1 loops=3D1)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 Buffers: local hit=3D1
(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 =3D 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.

I took a look at this patch= and I did a little polishing on it.

And I believe that in testing, = you need to set it to BUFFERS OFF,
because of the recent change made to = ANALYZE.

The tests are failing, like this:=C2=A0
QUERY PLA= N
=C2=A0----------------------------------------------------------------= ---------
=C2=A0Nested Loop Semi Join (actual rows=3D2 loops=3D1)
+ B= uffers: local hit=3D7
=C2=A0-> Seq Scan on ta (actual rows=3D2 loops= =3D1)
+ Buffers: local hit=3D1
=C2=A0-> Nested Loop (actual rows= =3D1 loops=3D2)
+ Buffers: local hit=3D6
=C2=A0-> Index Only Scan = using tb_pkey on tb (actual rows=3D1 loops=3D2)
=C2=A0Index Cond: (id = =3D ta.id)
=C2=A0Heap Fetches: 2
+ Buffe= rs: local hit=3D4
=C2=A0-> Seq Scan on tc (actual rows=3D1 loops=3D2)=
-(7 rows)
+ Buffers: local hit=3D2
+(12 rows)

=
best regards,
Ranier Vilela
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