Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1XGvtu-0003AS-06 for pgsql-sql@arkaria.postgresql.org; Mon, 11 Aug 2014 20:09:02 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1XGvts-00062q-G8 for pgsql-sql@arkaria.postgresql.org; Mon, 11 Aug 2014 20:09:00 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1XGvtr-00062g-5H for pgsql-sql@postgresql.org; Mon, 11 Aug 2014 20:08:59 +0000 Received: from post.officenet.no ([195.225.13.103]) by magus.postgresql.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1XGvth-0004OS-Ev for pgsql-sql@postgresql.org; Mon, 11 Aug 2014 20:08:57 +0000 Received: from [10.47.1.10] (helo=tc7-on) by post.officenet.no with esmtp (Exim 4.76) (envelope-from ) id 1XGvtd-000GKL-61 for pgsql-sql@postgresql.org; Mon, 11 Aug 2014 22:08:47 +0200 Received: from localhost ([127.0.0.1] helo=tc7-on) by tc7-on with esmtp (Exim 4.76) (envelope-from ) id 1XGvsv-0004SN-Pb for pgsql-sql@postgresql.org; Mon, 11 Aug 2014 22:08:01 +0200 Date: Mon, 11 Aug 2014 22:08:01 +0200 (CEST) From: Andreas Joseph Krogh To: pgsql-sql@postgresql.org Message-ID: In-Reply-To: <1407786572.35943.YahooMailNeo@web172205.mail.ir2.yahoo.com> Subject: Re: How to optimize WHERE column_a IS NOT NULL OR column_b = 'value' MIME-Version: 1.0 X-Mailer: Visena Mail 1.9.0-SNAPSHOT X-Spam-Score: -1.0 X-Spam-Report: SpamAssasin (score=-1.0, required 5.0 ALL_TRUSTED=-1, HTML_MESSAGE=0.001) X-Pg-Spam-Score: -1.9 (-) Content-Type: multipart/related; boundary="----=_Part_86_1906555916.1407787681402" List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-sql Precedence: bulk Sender: pgsql-sql-owner@postgresql.org ------=_Part_85_1025237571.1407787681402 Content-Type: multipart/related; boundary="----=_Part_86_1906555916.1407787681402" ------=_Part_86_1906555916.1407787681402 Content-Type: multipart/alternative; boundary="----=_Part_87_260495217.1407787681423" ------=_Part_87_260495217.1407787681423 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Start a new thread =C2=A0 P=C3=A5 mandag 11. august 2014 kl. 21:49:32, skre= v SENADIN < senadin2006@yahoo.fr >: Hello I am looking for= a=20 funtion to calculate the size of a record in a table in a database. Thank y= ou=20 Anned=20 =C2=A0 Le Lundi 11 ao=C3=BBt 2014 14h37, Pavel Stehule a=20 =C3=A9crit : =C2=A0 Hi =C2=A0 2014-08-11 18:01 GMT+02:00 Andreas Joseph Kro= gh < andreas@visena.com >: Hi folks, =C2=A0 I have th= e=20 following schema (simplified for this example). =C2=A0 create table folder(= id=20 integer primary key, name varchar not null); =C2=A0 create table document(i= d serial=20 primary key, name varchar not null, owner_id integer not null, folder_id=20 integer references folder(id)); create index document_owner_idx ON=20 document(owner_id); create index document_folder_idx ON document(folder_id)= ; =C2=A0=20 insert into folder(id, name) values(1, 'Folder A'); insert into folder(id,= =20 name) values(2, 'Folder B'); insert into document(name, owner_id, folder_id= )=20 values('Document A',=C2=A0 1, 1); insert into document(name, owner_id, fold= er_id)=20 values('Document B',=C2=A0 1, NULL); insert into document(name, owner_id, f= older_id)=20 values('Document C',=C2=A0 2, 2); insert into document(name, owner_id, fold= er_id)=20 values('Document D',=C2=A0 2, NULL); =C2=A0 select f.id , f.n= ame=20 , doc.id , doc.owner_id, doc.name=20 FROM document doc left outer join folder f ON doc.folder= _id =3D f.id WHERE doc.folder_id is not null OR doc.owner_id =3D 1; = =C2=A0=20 =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=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 QUERY PLAN =20 ---------------------------------------------------------------------------= -------------------------------------------------- =C2=A0Nested Loop Left Join=C2=A0 (cost=3D0.15..13.77 rows=3D4 width=3D76)= (actual=20 time=3D0.031..0.045 rows=3D3 loops=3D1) =C2=A0=C2=A0 ->=C2=A0 Seq Scan on document doc=C2=A0 (cost=3D0.00..1.05 ro= ws=3D4 width=3D44) (actual=20 time=3D0.012..0.018 rows=3D3 loops=3D1) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Filter: ((folder_id IS NO= T NULL) OR (owner_id =3D 1)) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Rows Removed by Filter: 1 =C2=A0=C2=A0 ->=C2=A0 Index Scan using folder_pkey on folder f=C2=A0 (cost= =3D0.15..3.17 rows=3D1=20 width=3D36) (actual time=3D0.005..0.006 rows=3D1 loops=3D3) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Index Cond: (doc.folder_i= d =3D id) =C2=A0Planning time: 0.267 ms =C2=A0Execution time: 0.094 ms (8 rows) =C2=A0 =C2=A0 Is the a way to write a query which uses an index e= fficiently=20 for such a schema? =C2=A0 I'd like to eliminate the Filter: ((folder_id IS = NOT NULL)=20 OR (owner_id =3D 1)) and rather have "index cond" insted, is that possible?= =C2=A0=20 your example is partially broken - ANALYZE and hashjoin and seqscan=20 penalization are missing - index scan is not used due too small table sizes =C2=A0 I tested 9.5, probably same as 9.4 and there indexes are used postgres=3D# set enable_hashjoin to off; SET Time: 0.473 ms postgres=3D# set enable_seqscan to off; SET Time: 0.904 ms postgres=3D# explain select f.id , f.name , = doc.id , doc.owner_id, doc.name FROM document doc left outer join folder f ON doc.folder_id =3D f.id=20 WHERE doc.folder_id is not null OR doc.owner_id =3D 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=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 QUERY=20 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=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =20 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 =C2=A0Merge Left Join=C2=A0 (cost=3D0.26..24.38 rows=3D3 width=3D32) =C2=A0=C2=A0 Merge Cond: (doc.folder_id =3D f.id ) =C2=A0=C2=A0 ->=C2=A0 Index Scan using document_folder_idx on document doc= =C2=A0=20 (cost=3D0.13..12.20 rows=3D3 width=3D23) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Filter: ((folder_id IS NO= T NULL) OR (owner_id =3D 1)) =C2=A0=C2=A0 ->=C2=A0 Index Scan using folder_pkey on folder f=C2=A0 (cost= =3D0.13..12.16 rows=3D2=20 width=3D13) =C2=A0Planning time: 0.663 ms (6 rows) =C2=A0 default 9.2, 9.3, ... postgres=3D# explain select f.id , f.name , = doc.id , doc.owner_id, doc.name FROM document doc left outer join folder f ON doc.folder_id =3D f.id=20 WHERE doc.folder_id is not null OR doc.owner_id =3D 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=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 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80 =C2=A0Hash Left Join=C2=A0 (cost=3D1.04..2.12 rows=3D3 width=3D32) =C2=A0=C2=A0 Hash Cond: (doc.folder_id =3D f.id ) =C2=A0=C2=A0 ->=C2=A0 Seq Scan on document doc=C2=A0 (cost=3D0.00..1.05 ro= ws=3D3 width=3D23) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Filter: ((folder_id IS NO= T NULL) OR (owner_id =3D 1)) =C2=A0=C2=A0 ->=C2=A0 Hash=C2=A0 (cost=3D1.02..1.02 rows=3D2 width=3D13) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ->=C2=A0 Seq Scan on fold= er f=C2=A0 (cost=3D0.00..1.02 rows=3D2 width=3D13) (6 rows) =C2=A0 and 9.2 after hashjoin and indexscan penalization postgres=3D# explain select f.id , f.name , = doc.id , doc.owner_id, doc.name FROM document doc left outer join folder f ON doc.folder_id =3D f.id=20 WHERE doc.folder_id is not null OR doc.owner_id =3D 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=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 QUERY=20 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=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =20 =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80 =C2=A0Merge Left Join=C2=A0 (cost=3D0.00..24.62 rows=3D3 width=3D32) =C2=A0=C2=A0 Merge Cond: (doc.folder_id =3D f.id ) =C2=A0=C2=A0 ->=C2=A0 Index Scan using document_folder_idx on document doc= =C2=A0=20 (cost=3D0.00..12.32 rows=3D3 width=3D23) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Filter: ((folder_id IS NO= T NULL) OR (owner_id =3D 1)) =C2=A0=C2=A0 ->=C2=A0 Index Scan using folder_pkey on folder f=C2=A0 (cost= =3D0.00..12.28 rows=3D2=20 width=3D13) (5 rows) Time: 2.258 ms =C2=A0 What is your PostgreSQL? =C2=A0 Regards =C2=A0 Pavel =C2=A0 P.S. ten years ago I had a similar issue - "OR" predikates can be r= eplaced=20 by UNION =C2=A0 you can try: =C2=A0 SELECT * FROM (SELECT * FROM doc =C2=A0 WHERE folder_id IS NOT NULL UNION =C2=A0 SELECT * FROM doc =C2=A0 W= HERE owner_id =3D 1)=20 s =C2=A0 LEFT JOIN folder ON s.folder_id =3D folder.id =C2=A0 or some similar magic =C2=A0 =C2=A0 select f.id , f.n= ame=20 , doc.id , doc.owner_id, doc.name=20 FROM document doc left outer join folder f ON doc.folder= _id =3D f.id WHERE doc.folder_id is not null OR doc.owner_id =3D 1; = =C2=A0 =C2=A0 =C2=A0=20 --Andreas Joseph Krogh CTO / Partner - Visena AS Mobile: +47 909 56 963 <>= =20 andreas@visena.com www.visena.com=20 =C2=A0 =C2=A0=20 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -- Andreas Joseph Krogh CTO / Partner - Visena= AS Mobile: +47 909 56=20 963 andreas@visena.com www.visena.com=20 =C2=A0 ------=_Part_87_260495217.1407787681423 Content-Type: text/html;charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Start a new thread
=C2=A0
P=C3=A5 mandag 11. august 2014 kl. 21:49:32, skrev SENADIN <senadin2006@yahoo.fr>:
Hello
I am looking for a funtion to calculate the size of a recor= d in a table in a database. Thank you
Anned

=C2=A0
Le Lundi 11 ao=C3=BBt 2014= 14h37, Pavel Stehule <pavel.stehule@gmail.com> a =C3=A9crit :=
=C2=A0
Hi
=C2=A0
2014-08-11 18:01 GMT+02:00 Andreas = Joseph Krogh <andreas@visena.com>:
Hi folks,
=C2=A0
I have the following schema (simplified for this example).
=C2=A0
create table folder(id integer primary key, name varchar not null);
=C2=A0
create table document(id serial primary key, name varchar not null, ow= ner_id integer not null, folder_id integer references folder(id));
create index document_owner_idx ON document(owner_id);
create index document_folder_idx ON document(folder_id);
=C2=A0
insert into folder(id, name) values(1, 'Folder A');
insert into folder(id, name) values(2, 'Folder B');
insert into document(name, owner_id, folder_id) values('Document A',= =C2=A0 1, 1);
insert into document(name, owner_id, folder_id) values('Document B',= =C2=A0 1, NULL);
insert into document(name, owner_id, folder_id) values('Document C',= =C2=A0 2, 2);
insert into document(name, owner_id, folder_id) values('Document D',= =C2=A0 2, NULL);
=C2=A0
select f.id, f.name, doc.id, doc.owner_id, doc.nam= e
FROM document doc left outer join folder f ON doc.folder_id =3D f.id
WHERE doc.folder_id is not null OR doc.owner_id =3D 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=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=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=A0Nested Loop Left Join=C2=A0 (cost=3D0.15..13.77 rows=3D4 width=3D76) = (actual time=3D0.031..0.045 rows=3D3 loops=3D1)
=C2=A0=C2=A0 ->=C2=A0 Seq Scan on document doc=C2=A0 (cost=3D0.00..1.05 = rows=3D4 width=3D44) (actual time=3D0.012..0.018 rows=3D3 loops=3D1)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Filter: ((folder_id IS NOT= NULL) OR (owner_id =3D 1))
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Rows Removed by Filter: 1<= br clear=3D"none"> =C2=A0=C2=A0 ->=C2=A0 Index Scan using folder_pkey on folder f=C2=A0 (co= st=3D0.15..3.17 rows=3D1 width=3D36) (actual time=3D0.005..0.006 rows=3D1 l= oops=3D3)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Index Cond: (doc.folder_id= =3D id)
=C2=A0Planning time: 0.267 ms
=C2=A0Execution time: 0.094 ms
(8 rows)
=C2=A0
=C2=A0
Is the a way to write a query which uses an index efficiently for such= a schema?
=C2=A0
I'd like to eliminate the Filter: ((folder_id IS NOT NULL) OR (owner_i= d =3D 1)) and rather have "index cond" insted, is that possible?<= /div>
=C2=A0
your example is partially broken - ANALYZE and hashjoin and seqscan pe= nalization are missing - index scan is not used due too small table sizes =C2=A0
I tested 9.5, probably same as 9.4 and there indexes are used

postgres=3D# set enable_hashjoin to off;
SET
Time: 0.473 ms
postgres=3D# set enable_seqscan to off;
SET
Time: 0.904 ms
postgres=3D# explain select f.id, f.name, doc.id, doc.owner= _id, doc.name
FROM document doc left outer join folder f ON doc.folder_id =3D f.id WHERE doc.folder_id is not null OR doc.owner_id =3D 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=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 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=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80
=C2=A0Merge Left Join=C2=A0 (cost=3D0.26..24.38 rows=3D3 width=3D32)
=C2=A0=C2=A0 Merge Cond: (doc.folder_id =3D f.id)
=C2=A0=C2=A0 ->=C2=A0 Index Scan using document_folder_idx on document d= oc=C2=A0 (cost=3D0.13..12.20 rows=3D3 width=3D23)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Filter: ((folder_id IS NOT= NULL) OR (owner_id =3D 1))
=C2=A0=C2=A0 ->=C2=A0 Index Scan using folder_pkey on folder f=C2=A0 (co= st=3D0.13..12.16 rows=3D2 width=3D13)
=C2=A0Planning time: 0.663 ms
(6 rows)
=C2=A0
default 9.2, 9.3, ...

postgres=3D# explain select f.id, f.name, doc.id, doc.owner= _id, doc.name
FROM document doc left outer join folder f ON doc.folder_id =3D f.id WHERE doc.folder_id is not null OR doc.owner_id =3D 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=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
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80
=C2=A0Hash Left Join=C2=A0 (cost=3D1.04..2.12 rows=3D3 width=3D32)
=C2=A0=C2=A0 Hash Cond: (doc.folder_id =3D f.id)
=C2=A0=C2=A0 ->=C2=A0 Seq Scan on document doc=C2=A0 (cost=3D0.00..1.05 = rows=3D3 width=3D23)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Filter: ((folder_id IS NOT= NULL) OR (owner_id =3D 1))
=C2=A0=C2=A0 ->=C2=A0 Hash=C2=A0 (cost=3D1.02..1.02 rows=3D2 width=3D13)=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ->=C2=A0 Seq Scan on fo= lder f=C2=A0 (cost=3D0.00..1.02 rows=3D2 width=3D13)
(6 rows)
=C2=A0
and 9.2 after hashjoin and indexscan penalization

postgres=3D# explain select f.id, f.name, doc.id, doc.owner= _id, doc.name
FROM document doc left outer join folder f ON doc.folder_id =3D f.id WHERE doc.folder_id is not null OR doc.owner_id =3D 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=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 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=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80= =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94= =80=E2=94=80=E2=94=80=E2=94=80=E2=94=80
=C2=A0Merge Left Join=C2=A0 (cost=3D0.00..24.62 rows=3D3 width=3D32)
=C2=A0=C2=A0 Merge Cond: (doc.folder_id =3D f.id)
=C2=A0=C2=A0 ->=C2=A0 Index Scan using document_folder_idx on document d= oc=C2=A0 (cost=3D0.00..12.32 rows=3D3 width=3D23)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Filter: ((folder_id IS NOT= NULL) OR (owner_id =3D 1))
=C2=A0=C2=A0 ->=C2=A0 Index Scan using folder_pkey on folder f=C2=A0 (co= st=3D0.00..12.28 rows=3D2 width=3D13)
(5 rows)

Time: 2.258 ms
=C2=A0
What is your PostgreSQL?
=C2=A0
Regards
=C2=A0
Pavel
=C2=A0
P.S. ten years ago I had a similar issue - "OR" predikates c= an be replaced by UNION
=C2=A0
you can try:
=C2=A0
SELECT * FROM
(SELECT * FROM doc
=C2=A0 WHERE folder_id IS NOT NULL
UNION
=C2=A0 SELECT * FROM doc
=C2=A0 WHERE owner_id =3D 1) s
=C2=A0 LEFT JOIN folder ON s.folder_id =3D folder.id
=C2=A0
or some similar magic
= =C2=A0
= =C2=A0
= =C2=A0

=C2=A0
=C2=A0
=C2=A0
=C2=A0
--
Andrea= s Joseph Krogh
CTO / Partner<= /span> - Visena AS
Mobile: +47 90= 9 56 963
=3D""
=C2=A0
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