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postgresql/src/test/regress/expected/inherit.out
Tom Lane cde35cf4ae Fix eclass_useful_for_merging to give valid results for appendrel children. 
Formerly, this function would always return "true" for an appendrel child
relation, because it would think that the appendrel parent was a potential
join target for the child.  In principle that should only lead to some
inefficiency in planning, but fuzz testing by Andreas Seltenreich disclosed
that it could lead to "could not find pathkey item to sort" planner errors
in odd corner cases.  Specifically, we would think that all columns of a
child table's multicolumn index were interesting pathkeys, causing us to
generate a MergeAppend path that sorts by all the columns.  However, if any
of those columns weren't actually used above the level of the appendrel,
they would not get added to that rel's targetlist, which would result in
being unable to resolve the MergeAppend's sort keys against its targetlist
during createplan.c.

Backpatch to 9.3.  In older versions, columns of an appendrel get added
to its targetlist even if they're not mentioned above the scan level,
so that the failure doesn't occur.  It might be worth back-patching this
fix to older versions anyway, but I'll refrain for the moment.
2015-08-06 20:14:53 -04:00

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--
-- Test inheritance features
--
CREATE TABLE a (aa TEXT);
CREATE TABLE b (bb TEXT) INHERITS (a);
CREATE TABLE c (cc TEXT) INHERITS (a);
CREATE TABLE d (dd TEXT) INHERITS (b,c,a);
NOTICE: merging multiple inherited definitions of column "aa"
NOTICE: merging multiple inherited definitions of column "aa"
INSERT INTO a(aa) VALUES('aaa');
INSERT INTO a(aa) VALUES('aaaa');
INSERT INTO a(aa) VALUES('aaaaa');
INSERT INTO a(aa) VALUES('aaaaaa');
INSERT INTO a(aa) VALUES('aaaaaaa');
INSERT INTO a(aa) VALUES('aaaaaaaa');
INSERT INTO b(aa) VALUES('bbb');
INSERT INTO b(aa) VALUES('bbbb');
INSERT INTO b(aa) VALUES('bbbbb');
INSERT INTO b(aa) VALUES('bbbbbb');
INSERT INTO b(aa) VALUES('bbbbbbb');
INSERT INTO b(aa) VALUES('bbbbbbbb');
INSERT INTO c(aa) VALUES('ccc');
INSERT INTO c(aa) VALUES('cccc');
INSERT INTO c(aa) VALUES('ccccc');
INSERT INTO c(aa) VALUES('cccccc');
INSERT INTO c(aa) VALUES('ccccccc');
INSERT INTO c(aa) VALUES('cccccccc');
INSERT INTO d(aa) VALUES('ddd');
INSERT INTO d(aa) VALUES('dddd');
INSERT INTO d(aa) VALUES('ddddd');
INSERT INTO d(aa) VALUES('dddddd');
INSERT INTO d(aa) VALUES('ddddddd');
INSERT INTO d(aa) VALUES('dddddddd');
SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+----------
a | aaa
a | aaaa
a | aaaaa
a | aaaaaa
a | aaaaaaa
a | aaaaaaaa
b | bbb
b | bbbb
b | bbbbb
b | bbbbbb
b | bbbbbbb
b | bbbbbbbb
c | ccc
c | cccc
c | ccccc
c | cccccc
c | ccccccc
c | cccccccc
d | ddd
d | dddd
d | ddddd
d | dddddd
d | ddddddd
d | dddddddd
(24 rows)
SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+----------+----
b | bbb |
b | bbbb |
b | bbbbb |
b | bbbbbb |
b | bbbbbbb |
b | bbbbbbbb |
d | ddd |
d | dddd |
d | ddddd |
d | dddddd |
d | ddddddd |
d | dddddddd |
(12 rows)
SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+----------+----
c | ccc |
c | cccc |
c | ccccc |
c | cccccc |
c | ccccccc |
c | cccccccc |
d | ddd |
d | dddd |
d | ddddd |
d | dddddd |
d | ddddddd |
d | dddddddd |
(12 rows)
SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+----------+----+----+----
d | ddd | | |
d | dddd | | |
d | ddddd | | |
d | dddddd | | |
d | ddddddd | | |
d | dddddddd | | |
(6 rows)
SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+----------
a | aaa
a | aaaa
a | aaaaa
a | aaaaaa
a | aaaaaaa
a | aaaaaaaa
(6 rows)
SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+----------+----
b | bbb |
b | bbbb |
b | bbbbb |
b | bbbbbb |
b | bbbbbbb |
b | bbbbbbbb |
(6 rows)
SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+----------+----
c | ccc |
c | cccc |
c | ccccc |
c | cccccc |
c | ccccccc |
c | cccccccc |
(6 rows)
SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+----------+----+----+----
d | ddd | | |
d | dddd | | |
d | ddddd | | |
d | dddddd | | |
d | ddddddd | | |
d | dddddddd | | |
(6 rows)
UPDATE a SET aa='zzzz' WHERE aa='aaaa';
UPDATE ONLY a SET aa='zzzzz' WHERE aa='aaaaa';
UPDATE b SET aa='zzz' WHERE aa='aaa';
UPDATE ONLY b SET aa='zzz' WHERE aa='aaa';
UPDATE a SET aa='zzzzzz' WHERE aa LIKE 'aaa%';
SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+----------
a | zzzz
a | zzzzz
a | zzzzzz
a | zzzzzz
a | zzzzzz
a | zzzzzz
b | bbb
b | bbbb
b | bbbbb
b | bbbbbb
b | bbbbbbb
b | bbbbbbbb
c | ccc
c | cccc
c | ccccc
c | cccccc
c | ccccccc
c | cccccccc
d | ddd
d | dddd
d | ddddd
d | dddddd
d | ddddddd
d | dddddddd
(24 rows)
SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+----------+----
b | bbb |
b | bbbb |
b | bbbbb |
b | bbbbbb |
b | bbbbbbb |
b | bbbbbbbb |
d | ddd |
d | dddd |
d | ddddd |
d | dddddd |
d | ddddddd |
d | dddddddd |
(12 rows)
SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+----------+----
c | ccc |
c | cccc |
c | ccccc |
c | cccccc |
c | ccccccc |
c | cccccccc |
d | ddd |
d | dddd |
d | ddddd |
d | dddddd |
d | ddddddd |
d | dddddddd |
(12 rows)
SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+----------+----+----+----
d | ddd | | |
d | dddd | | |
d | ddddd | | |
d | dddddd | | |
d | ddddddd | | |
d | dddddddd | | |
(6 rows)
SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+--------
a | zzzz
a | zzzzz
a | zzzzzz
a | zzzzzz
a | zzzzzz
a | zzzzzz
(6 rows)
SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+----------+----
b | bbb |
b | bbbb |
b | bbbbb |
b | bbbbbb |
b | bbbbbbb |
b | bbbbbbbb |
(6 rows)
SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+----------+----
c | ccc |
c | cccc |
c | ccccc |
c | cccccc |
c | ccccccc |
c | cccccccc |
(6 rows)
SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+----------+----+----+----
d | ddd | | |
d | dddd | | |
d | ddddd | | |
d | dddddd | | |
d | ddddddd | | |
d | dddddddd | | |
(6 rows)
UPDATE b SET aa='new';
SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+----------
a | zzzz
a | zzzzz
a | zzzzzz
a | zzzzzz
a | zzzzzz
a | zzzzzz
b | new
b | new
b | new
b | new
b | new
b | new
c | ccc
c | cccc
c | ccccc
c | cccccc
c | ccccccc
c | cccccccc
d | new
d | new
d | new
d | new
d | new
d | new
(24 rows)
SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+-----+----
b | new |
b | new |
b | new |
b | new |
b | new |
b | new |
d | new |
d | new |
d | new |
d | new |
d | new |
d | new |
(12 rows)
SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+----------+----
c | ccc |
c | cccc |
c | ccccc |
c | cccccc |
c | ccccccc |
c | cccccccc |
d | new |
d | new |
d | new |
d | new |
d | new |
d | new |
(12 rows)
SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+-----+----+----+----
d | new | | |
d | new | | |
d | new | | |
d | new | | |
d | new | | |
d | new | | |
(6 rows)
SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+--------
a | zzzz
a | zzzzz
a | zzzzzz
a | zzzzzz
a | zzzzzz
a | zzzzzz
(6 rows)
SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+-----+----
b | new |
b | new |
b | new |
b | new |
b | new |
b | new |
(6 rows)
SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+----------+----
c | ccc |
c | cccc |
c | ccccc |
c | cccccc |
c | ccccccc |
c | cccccccc |
(6 rows)
SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+-----+----+----+----
d | new | | |
d | new | | |
d | new | | |
d | new | | |
d | new | | |
d | new | | |
(6 rows)
UPDATE a SET aa='new';
DELETE FROM ONLY c WHERE aa='new';
SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+-----
a | new
a | new
a | new
a | new
a | new
a | new
b | new
b | new
b | new
b | new
b | new
b | new
d | new
d | new
d | new
d | new
d | new
d | new
(18 rows)
SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+-----+----
b | new |
b | new |
b | new |
b | new |
b | new |
b | new |
d | new |
d | new |
d | new |
d | new |
d | new |
d | new |
(12 rows)
SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+-----+----
d | new |
d | new |
d | new |
d | new |
d | new |
d | new |
(6 rows)
SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+-----+----+----+----
d | new | | |
d | new | | |
d | new | | |
d | new | | |
d | new | | |
d | new | | |
(6 rows)
SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+-----
a | new
a | new
a | new
a | new
a | new
a | new
(6 rows)
SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+-----+----
b | new |
b | new |
b | new |
b | new |
b | new |
b | new |
(6 rows)
SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+----+----
(0 rows)
SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+-----+----+----+----
d | new | | |
d | new | | |
d | new | | |
d | new | | |
d | new | | |
d | new | | |
(6 rows)
DELETE FROM a;
SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+----
(0 rows)
SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+----+----
(0 rows)
SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+----+----
(0 rows)
SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+----+----+----+----
(0 rows)
SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
relname | aa
---------+----
(0 rows)
SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
relname | aa | bb
---------+----+----
(0 rows)
SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
relname | aa | cc
---------+----+----
(0 rows)
SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
relname | aa | bb | cc | dd
---------+----+----+----+----
(0 rows)
-- Confirm PRIMARY KEY adds NOT NULL constraint to child table
CREATE TEMP TABLE z (b TEXT, PRIMARY KEY(aa, b)) inherits (a);
INSERT INTO z VALUES (NULL, 'text'); -- should fail
ERROR: null value in column "aa" violates not-null constraint
DETAIL: Failing row contains (null, text).
-- Check UPDATE with inherited target and an inherited source table
create temp table foo(f1 int, f2 int);
create temp table foo2(f3 int) inherits (foo);
create temp table bar(f1 int, f2 int);
create temp table bar2(f3 int) inherits (bar);
insert into foo values(1,1);
insert into foo values(3,3);
insert into foo2 values(2,2,2);
insert into foo2 values(3,3,3);
insert into bar values(1,1);
insert into bar values(2,2);
insert into bar values(3,3);
insert into bar values(4,4);
insert into bar2 values(1,1,1);
insert into bar2 values(2,2,2);
insert into bar2 values(3,3,3);
insert into bar2 values(4,4,4);
update bar set f2 = f2 + 100 where f1 in (select f1 from foo);
select tableoid::regclass::text as relname, bar.* from bar order by 1,2;
relname | f1 | f2
---------+----+-----
bar | 1 | 101
bar | 2 | 102
bar | 3 | 103
bar | 4 | 4
bar2 | 1 | 101
bar2 | 2 | 102
bar2 | 3 | 103
bar2 | 4 | 4
(8 rows)
-- Check UPDATE with inherited target and an appendrel subquery
update bar set f2 = f2 + 100
from
( select f1 from foo union all select f1+3 from foo ) ss
where bar.f1 = ss.f1;
select tableoid::regclass::text as relname, bar.* from bar order by 1,2;
relname | f1 | f2
---------+----+-----
bar | 1 | 201
bar | 2 | 202
bar | 3 | 203
bar | 4 | 104
bar2 | 1 | 201
bar2 | 2 | 202
bar2 | 3 | 203
bar2 | 4 | 104
(8 rows)
/* Test multiple inheritance of column defaults */
CREATE TABLE firstparent (tomorrow date default now()::date + 1);
CREATE TABLE secondparent (tomorrow date default now() :: date + 1);
CREATE TABLE jointchild () INHERITS (firstparent, secondparent); -- ok
NOTICE: merging multiple inherited definitions of column "tomorrow"
CREATE TABLE thirdparent (tomorrow date default now()::date - 1);
CREATE TABLE otherchild () INHERITS (firstparent, thirdparent); -- not ok
NOTICE: merging multiple inherited definitions of column "tomorrow"
ERROR: column "tomorrow" inherits conflicting default values
HINT: To resolve the conflict, specify a default explicitly.
CREATE TABLE otherchild (tomorrow date default now())
INHERITS (firstparent, thirdparent); -- ok, child resolves ambiguous default
NOTICE: merging multiple inherited definitions of column "tomorrow"
NOTICE: merging column "tomorrow" with inherited definition
DROP TABLE firstparent, secondparent, jointchild, thirdparent, otherchild;
-- Test changing the type of inherited columns
insert into d values('test','one','two','three');
alter table a alter column aa type integer using bit_length(aa);
select * from d;
aa | bb | cc | dd
----+-----+-----+-------
32 | one | two | three
(1 row)
-- Test non-inheritable parent constraints
create table p1(ff1 int);
alter table p1 add constraint p1chk check (ff1 > 0) no inherit;
alter table p1 add constraint p2chk check (ff1 > 10);
-- connoinherit should be true for NO INHERIT constraint
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.connoinherit from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname = 'p1' order by 1,2;
relname | conname | contype | conislocal | coninhcount | connoinherit
---------+---------+---------+------------+-------------+--------------
p1 | p1chk | c | t | 0 | t
p1 | p2chk | c | t | 0 | f
(2 rows)
-- Test that child does not inherit NO INHERIT constraints
create table c1 () inherits (p1);
\d p1
Table "public.p1"
Column | Type | Modifiers
--------+---------+-----------
ff1 | integer |
Check constraints:
"p1chk" CHECK (ff1 > 0) NO INHERIT
"p2chk" CHECK (ff1 > 10)
Number of child tables: 1 (Use \d+ to list them.)
\d c1
Table "public.c1"
Column | Type | Modifiers
--------+---------+-----------
ff1 | integer |
Check constraints:
"p2chk" CHECK (ff1 > 10)
Inherits: p1
drop table p1 cascade;
NOTICE: drop cascades to table c1
-- Tests for casting between the rowtypes of parent and child
-- tables. See the pgsql-hackers thread beginning Dec. 4/04
create table base (i integer);
create table derived () inherits (base);
insert into derived (i) values (0);
select derived::base from derived;
derived
---------
(0)
(1 row)
drop table derived;
drop table base;
create table p1(ff1 int);
create table p2(f1 text);
create function p2text(p2) returns text as 'select $1.f1' language sql;
create table c1(f3 int) inherits(p1,p2);
insert into c1 values(123456789, 'hi', 42);
select p2text(c1.*) from c1;
p2text
--------
hi
(1 row)
drop function p2text(p2);
drop table c1;
drop table p2;
drop table p1;
CREATE TABLE ac (aa TEXT);
alter table ac add constraint ac_check check (aa is not null);
CREATE TABLE bc (bb TEXT) INHERITS (ac);
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+----------+---------+------------+-------------+------------------
ac | ac_check | c | t | 0 | (aa IS NOT NULL)
bc | ac_check | c | f | 1 | (aa IS NOT NULL)
(2 rows)
insert into ac (aa) values (NULL);
ERROR: new row for relation "ac" violates check constraint "ac_check"
DETAIL: Failing row contains (null).
insert into bc (aa) values (NULL);
ERROR: new row for relation "bc" violates check constraint "ac_check"
DETAIL: Failing row contains (null, null).
alter table bc drop constraint ac_check; -- fail, disallowed
ERROR: cannot drop inherited constraint "ac_check" of relation "bc"
alter table ac drop constraint ac_check;
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+---------+---------+------------+-------------+--------
(0 rows)
-- try the unnamed-constraint case
alter table ac add check (aa is not null);
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+-------------+---------+------------+-------------+------------------
ac | ac_aa_check | c | t | 0 | (aa IS NOT NULL)
bc | ac_aa_check | c | f | 1 | (aa IS NOT NULL)
(2 rows)
insert into ac (aa) values (NULL);
ERROR: new row for relation "ac" violates check constraint "ac_aa_check"
DETAIL: Failing row contains (null).
insert into bc (aa) values (NULL);
ERROR: new row for relation "bc" violates check constraint "ac_aa_check"
DETAIL: Failing row contains (null, null).
alter table bc drop constraint ac_aa_check; -- fail, disallowed
ERROR: cannot drop inherited constraint "ac_aa_check" of relation "bc"
alter table ac drop constraint ac_aa_check;
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+---------+---------+------------+-------------+--------
(0 rows)
alter table ac add constraint ac_check check (aa is not null);
alter table bc no inherit ac;
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+----------+---------+------------+-------------+------------------
ac | ac_check | c | t | 0 | (aa IS NOT NULL)
bc | ac_check | c | t | 0 | (aa IS NOT NULL)
(2 rows)
alter table bc drop constraint ac_check;
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+----------+---------+------------+-------------+------------------
ac | ac_check | c | t | 0 | (aa IS NOT NULL)
(1 row)
alter table ac drop constraint ac_check;
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+---------+---------+------------+-------------+--------
(0 rows)
drop table bc;
drop table ac;
create table ac (a int constraint check_a check (a <> 0));
create table bc (a int constraint check_a check (a <> 0), b int constraint check_b check (b <> 0)) inherits (ac);
NOTICE: merging column "a" with inherited definition
NOTICE: merging constraint "check_a" with inherited definition
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+---------+---------+------------+-------------+----------
ac | check_a | c | t | 0 | (a <> 0)
bc | check_a | c | t | 1 | (a <> 0)
bc | check_b | c | t | 0 | (b <> 0)
(3 rows)
drop table bc;
drop table ac;
create table ac (a int constraint check_a check (a <> 0));
create table bc (b int constraint check_b check (b <> 0));
create table cc (c int constraint check_c check (c <> 0)) inherits (ac, bc);
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc', 'cc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+---------+---------+------------+-------------+----------
ac | check_a | c | t | 0 | (a <> 0)
bc | check_b | c | t | 0 | (b <> 0)
cc | check_a | c | f | 1 | (a <> 0)
cc | check_b | c | f | 1 | (b <> 0)
cc | check_c | c | t | 0 | (c <> 0)
(5 rows)
alter table cc no inherit bc;
select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc', 'cc') order by 1,2;
relname | conname | contype | conislocal | coninhcount | consrc
---------+---------+---------+------------+-------------+----------
ac | check_a | c | t | 0 | (a <> 0)
bc | check_b | c | t | 0 | (b <> 0)
cc | check_a | c | f | 1 | (a <> 0)
cc | check_b | c | t | 0 | (b <> 0)
cc | check_c | c | t | 0 | (c <> 0)
(5 rows)
drop table cc;
drop table bc;
drop table ac;
create table p1(f1 int);
create table p2(f2 int);
create table c1(f3 int) inherits(p1,p2);
insert into c1 values(1,-1,2);
alter table p2 add constraint cc check (f2>0); -- fail
ERROR: check constraint "cc" is violated by some row
alter table p2 add check (f2>0); -- check it without a name, too
ERROR: check constraint "p2_f2_check" is violated by some row
delete from c1;
insert into c1 values(1,1,2);
alter table p2 add check (f2>0);
insert into c1 values(1,-1,2); -- fail
ERROR: new row for relation "c1" violates check constraint "p2_f2_check"
DETAIL: Failing row contains (1, -1, 2).
create table c2(f3 int) inherits(p1,p2);
\d c2
Table "public.c2"
Column | Type | Modifiers
--------+---------+-----------
f1 | integer |
f2 | integer |
f3 | integer |
Check constraints:
"p2_f2_check" CHECK (f2 > 0)
Inherits: p1,
p2
create table c3 (f4 int) inherits(c1,c2);
NOTICE: merging multiple inherited definitions of column "f1"
NOTICE: merging multiple inherited definitions of column "f2"
NOTICE: merging multiple inherited definitions of column "f3"
\d c3
Table "public.c3"
Column | Type | Modifiers
--------+---------+-----------
f1 | integer |
f2 | integer |
f3 | integer |
f4 | integer |
Check constraints:
"p2_f2_check" CHECK (f2 > 0)
Inherits: c1,
c2
drop table p1 cascade;
NOTICE: drop cascades to 3 other objects
DETAIL: drop cascades to table c1
drop cascades to table c2
drop cascades to table c3
drop table p2 cascade;
create table pp1 (f1 int);
create table cc1 (f2 text, f3 int) inherits (pp1);
alter table pp1 add column a1 int check (a1 > 0);
\d cc1
Table "public.cc1"
Column | Type | Modifiers
--------+---------+-----------
f1 | integer |
f2 | text |
f3 | integer |
a1 | integer |
Check constraints:
"pp1_a1_check" CHECK (a1 > 0)
Inherits: pp1
create table cc2(f4 float) inherits(pp1,cc1);
NOTICE: merging multiple inherited definitions of column "f1"
NOTICE: merging multiple inherited definitions of column "a1"
\d cc2
Table "public.cc2"
Column | Type | Modifiers
--------+------------------+-----------
f1 | integer |
a1 | integer |
f2 | text |
f3 | integer |
f4 | double precision |
Check constraints:
"pp1_a1_check" CHECK (a1 > 0)
Inherits: pp1,
cc1
alter table pp1 add column a2 int check (a2 > 0);
NOTICE: merging definition of column "a2" for child "cc2"
NOTICE: merging constraint "pp1_a2_check" with inherited definition
\d cc2
Table "public.cc2"
Column | Type | Modifiers
--------+------------------+-----------
f1 | integer |
a1 | integer |
f2 | text |
f3 | integer |
f4 | double precision |
a2 | integer |
Check constraints:
"pp1_a1_check" CHECK (a1 > 0)
"pp1_a2_check" CHECK (a2 > 0)
Inherits: pp1,
cc1
drop table pp1 cascade;
NOTICE: drop cascades to 2 other objects
DETAIL: drop cascades to table cc1
drop cascades to table cc2
-- Test for renaming in simple multiple inheritance
CREATE TABLE inht1 (a int, b int);
CREATE TABLE inhs1 (b int, c int);
CREATE TABLE inhts (d int) INHERITS (inht1, inhs1);
NOTICE: merging multiple inherited definitions of column "b"
ALTER TABLE inht1 RENAME a TO aa;
ALTER TABLE inht1 RENAME b TO bb; -- to be failed
ERROR: cannot rename inherited column "b"
ALTER TABLE inhts RENAME aa TO aaa; -- to be failed
ERROR: cannot rename inherited column "aa"
ALTER TABLE inhts RENAME d TO dd;
\d+ inhts
Table "public.inhts"
Column | Type | Modifiers | Storage | Stats target | Description
--------+---------+-----------+---------+--------------+-------------
aa | integer | | plain | |
b | integer | | plain | |
c | integer | | plain | |
dd | integer | | plain | |
Inherits: inht1,
inhs1
DROP TABLE inhts;
-- Test for renaming in diamond inheritance
CREATE TABLE inht2 (x int) INHERITS (inht1);
CREATE TABLE inht3 (y int) INHERITS (inht1);
CREATE TABLE inht4 (z int) INHERITS (inht2, inht3);
NOTICE: merging multiple inherited definitions of column "aa"
NOTICE: merging multiple inherited definitions of column "b"
ALTER TABLE inht1 RENAME aa TO aaa;
\d+ inht4
Table "public.inht4"
Column | Type | Modifiers | Storage | Stats target | Description
--------+---------+-----------+---------+--------------+-------------
aaa | integer | | plain | |
b | integer | | plain | |
x | integer | | plain | |
y | integer | | plain | |
z | integer | | plain | |
Inherits: inht2,
inht3
CREATE TABLE inhts (d int) INHERITS (inht2, inhs1);
NOTICE: merging multiple inherited definitions of column "b"
ALTER TABLE inht1 RENAME aaa TO aaaa;
ALTER TABLE inht1 RENAME b TO bb; -- to be failed
ERROR: cannot rename inherited column "b"
\d+ inhts
Table "public.inhts"
Column | Type | Modifiers | Storage | Stats target | Description
--------+---------+-----------+---------+--------------+-------------
aaaa | integer | | plain | |
b | integer | | plain | |
x | integer | | plain | |
c | integer | | plain | |
d | integer | | plain | |
Inherits: inht2,
inhs1
WITH RECURSIVE r AS (
SELECT 'inht1'::regclass AS inhrelid
UNION ALL
SELECT c.inhrelid FROM pg_inherits c, r WHERE r.inhrelid = c.inhparent
)
SELECT a.attrelid::regclass, a.attname, a.attinhcount, e.expected
FROM (SELECT inhrelid, count(*) AS expected FROM pg_inherits
WHERE inhparent IN (SELECT inhrelid FROM r) GROUP BY inhrelid) e
JOIN pg_attribute a ON e.inhrelid = a.attrelid WHERE NOT attislocal
ORDER BY a.attrelid::regclass::name, a.attnum;
attrelid | attname | attinhcount | expected
----------+---------+-------------+----------
inht2 | aaaa | 1 | 1
inht2 | b | 1 | 1
inht3 | aaaa | 1 | 1
inht3 | b | 1 | 1
inht4 | aaaa | 2 | 2
inht4 | b | 2 | 2
inht4 | x | 1 | 2
inht4 | y | 1 | 2
inhts | aaaa | 1 | 1
inhts | b | 2 | 1
inhts | x | 1 | 1
inhts | c | 1 | 1
(12 rows)
DROP TABLE inht1, inhs1 CASCADE;
NOTICE: drop cascades to 4 other objects
DETAIL: drop cascades to table inht2
drop cascades to table inhts
drop cascades to table inht3
drop cascades to table inht4
-- Test non-inheritable indices [UNIQUE, EXCLUDE] contraints
CREATE TABLE test_constraints (id int, val1 varchar, val2 int, UNIQUE(val1, val2));
CREATE TABLE test_constraints_inh () INHERITS (test_constraints);
\d+ test_constraints
Table "public.test_constraints"
Column | Type | Modifiers | Storage | Stats target | Description
--------+-------------------+-----------+----------+--------------+-------------
id | integer | | plain | |
val1 | character varying | | extended | |
val2 | integer | | plain | |
Indexes:
"test_constraints_val1_val2_key" UNIQUE CONSTRAINT, btree (val1, val2)
Child tables: test_constraints_inh
ALTER TABLE ONLY test_constraints DROP CONSTRAINT test_constraints_val1_val2_key;
\d+ test_constraints
Table "public.test_constraints"
Column | Type | Modifiers | Storage | Stats target | Description
--------+-------------------+-----------+----------+--------------+-------------
id | integer | | plain | |
val1 | character varying | | extended | |
val2 | integer | | plain | |
Child tables: test_constraints_inh
\d+ test_constraints_inh
Table "public.test_constraints_inh"
Column | Type | Modifiers | Storage | Stats target | Description
--------+-------------------+-----------+----------+--------------+-------------
id | integer | | plain | |
val1 | character varying | | extended | |
val2 | integer | | plain | |
Inherits: test_constraints
DROP TABLE test_constraints_inh;
DROP TABLE test_constraints;
CREATE TABLE test_ex_constraints (
c circle,
EXCLUDE USING gist (c WITH &&)
);
CREATE TABLE test_ex_constraints_inh () INHERITS (test_ex_constraints);
\d+ test_ex_constraints
Table "public.test_ex_constraints"
Column | Type | Modifiers | Storage | Stats target | Description
--------+--------+-----------+---------+--------------+-------------
c | circle | | plain | |
Indexes:
"test_ex_constraints_c_excl" EXCLUDE USING gist (c WITH &&)
Child tables: test_ex_constraints_inh
ALTER TABLE test_ex_constraints DROP CONSTRAINT test_ex_constraints_c_excl;
\d+ test_ex_constraints
Table "public.test_ex_constraints"
Column | Type | Modifiers | Storage | Stats target | Description
--------+--------+-----------+---------+--------------+-------------
c | circle | | plain | |
Child tables: test_ex_constraints_inh
\d+ test_ex_constraints_inh
Table "public.test_ex_constraints_inh"
Column | Type | Modifiers | Storage | Stats target | Description
--------+--------+-----------+---------+--------------+-------------
c | circle | | plain | |
Inherits: test_ex_constraints
DROP TABLE test_ex_constraints_inh;
DROP TABLE test_ex_constraints;
-- Test non-inheritable foreign key contraints
CREATE TABLE test_primary_constraints(id int PRIMARY KEY);
CREATE TABLE test_foreign_constraints(id1 int REFERENCES test_primary_constraints(id));
CREATE TABLE test_foreign_constraints_inh () INHERITS (test_foreign_constraints);
\d+ test_primary_constraints
Table "public.test_primary_constraints"
Column | Type | Modifiers | Storage | Stats target | Description
--------+---------+-----------+---------+--------------+-------------
id | integer | not null | plain | |
Indexes:
"test_primary_constraints_pkey" PRIMARY KEY, btree (id)
Referenced by:
TABLE "test_foreign_constraints" CONSTRAINT "test_foreign_constraints_id1_fkey" FOREIGN KEY (id1) REFERENCES test_primary_constraints(id)
\d+ test_foreign_constraints
Table "public.test_foreign_constraints"
Column | Type | Modifiers | Storage | Stats target | Description
--------+---------+-----------+---------+--------------+-------------
id1 | integer | | plain | |
Foreign-key constraints:
"test_foreign_constraints_id1_fkey" FOREIGN KEY (id1) REFERENCES test_primary_constraints(id)
Child tables: test_foreign_constraints_inh
ALTER TABLE test_foreign_constraints DROP CONSTRAINT test_foreign_constraints_id1_fkey;
\d+ test_foreign_constraints
Table "public.test_foreign_constraints"
Column | Type | Modifiers | Storage | Stats target | Description
--------+---------+-----------+---------+--------------+-------------
id1 | integer | | plain | |
Child tables: test_foreign_constraints_inh
\d+ test_foreign_constraints_inh
Table "public.test_foreign_constraints_inh"
Column | Type | Modifiers | Storage | Stats target | Description
--------+---------+-----------+---------+--------------+-------------
id1 | integer | | plain | |
Inherits: test_foreign_constraints
DROP TABLE test_foreign_constraints_inh;
DROP TABLE test_foreign_constraints;
DROP TABLE test_primary_constraints;
--
-- Test parameterized append plans for inheritance trees
--
create temp table patest0 (id, x) as
select x, x from generate_series(0,1000) x;
create temp table patest1() inherits (patest0);
insert into patest1
select x, x from generate_series(0,1000) x;
create temp table patest2() inherits (patest0);
insert into patest2
select x, x from generate_series(0,1000) x;
create index patest0i on patest0(id);
create index patest1i on patest1(id);
create index patest2i on patest2(id);
analyze patest0;
analyze patest1;
analyze patest2;
explain (costs off)
select * from patest0 join (select f1 from int4_tbl limit 1) ss on id = f1;
QUERY PLAN
--------------------------------------------------
Nested Loop
-> Limit
-> Seq Scan on int4_tbl
-> Append
-> Index Scan using patest0i on patest0
Index Cond: (id = int4_tbl.f1)
-> Index Scan using patest1i on patest1
Index Cond: (id = int4_tbl.f1)
-> Index Scan using patest2i on patest2
Index Cond: (id = int4_tbl.f1)
(10 rows)
select * from patest0 join (select f1 from int4_tbl limit 1) ss on id = f1;
id | x | f1
----+---+----
0 | 0 | 0
0 | 0 | 0
0 | 0 | 0
(3 rows)
drop index patest2i;
explain (costs off)
select * from patest0 join (select f1 from int4_tbl limit 1) ss on id = f1;
QUERY PLAN
--------------------------------------------------
Nested Loop
-> Limit
-> Seq Scan on int4_tbl
-> Append
-> Index Scan using patest0i on patest0
Index Cond: (id = int4_tbl.f1)
-> Index Scan using patest1i on patest1
Index Cond: (id = int4_tbl.f1)
-> Seq Scan on patest2
Filter: (int4_tbl.f1 = id)
(10 rows)
select * from patest0 join (select f1 from int4_tbl limit 1) ss on id = f1;
id | x | f1
----+---+----
0 | 0 | 0
0 | 0 | 0
0 | 0 | 0
(3 rows)
drop table patest0 cascade;
NOTICE: drop cascades to 2 other objects
DETAIL: drop cascades to table patest1
drop cascades to table patest2
--
-- Test merge-append plans for inheritance trees
--
create table matest0 (id serial primary key, name text);
create table matest1 (id integer primary key) inherits (matest0);
NOTICE: merging column "id" with inherited definition
create table matest2 (id integer primary key) inherits (matest0);
NOTICE: merging column "id" with inherited definition
create table matest3 (id integer primary key) inherits (matest0);
NOTICE: merging column "id" with inherited definition
create index matest0i on matest0 ((1-id));
create index matest1i on matest1 ((1-id));
-- create index matest2i on matest2 ((1-id)); -- intentionally missing
create index matest3i on matest3 ((1-id));
insert into matest1 (name) values ('Test 1');
insert into matest1 (name) values ('Test 2');
insert into matest2 (name) values ('Test 3');
insert into matest2 (name) values ('Test 4');
insert into matest3 (name) values ('Test 5');
insert into matest3 (name) values ('Test 6');
set enable_indexscan = off; -- force use of seqscan/sort, so no merge
explain (verbose, costs off) select * from matest0 order by 1-id;
QUERY PLAN
------------------------------------------------------------
Sort
Output: matest0.id, matest0.name, ((1 - matest0.id))
Sort Key: ((1 - matest0.id))
-> Result
Output: matest0.id, matest0.name, (1 - matest0.id)
-> Append
-> Seq Scan on public.matest0
Output: matest0.id, matest0.name
-> Seq Scan on public.matest1
Output: matest1.id, matest1.name
-> Seq Scan on public.matest2
Output: matest2.id, matest2.name
-> Seq Scan on public.matest3
Output: matest3.id, matest3.name
(14 rows)
select * from matest0 order by 1-id;
id | name
----+--------
6 | Test 6
5 | Test 5
4 | Test 4
3 | Test 3
2 | Test 2
1 | Test 1
(6 rows)
explain (verbose, costs off) select min(1-id) from matest0;
QUERY PLAN
----------------------------------------
Aggregate
Output: min((1 - matest0.id))
-> Append
-> Seq Scan on public.matest0
Output: matest0.id
-> Seq Scan on public.matest1
Output: matest1.id
-> Seq Scan on public.matest2
Output: matest2.id
-> Seq Scan on public.matest3
Output: matest3.id
(11 rows)
select min(1-id) from matest0;
min
-----
-5
(1 row)
reset enable_indexscan;
set enable_seqscan = off; -- plan with fewest seqscans should be merge
explain (verbose, costs off) select * from matest0 order by 1-id;
QUERY PLAN
------------------------------------------------------------------
Merge Append
Sort Key: ((1 - matest0.id))
-> Index Scan using matest0i on public.matest0
Output: matest0.id, matest0.name, (1 - matest0.id)
-> Index Scan using matest1i on public.matest1
Output: matest1.id, matest1.name, (1 - matest1.id)
-> Sort
Output: matest2.id, matest2.name, ((1 - matest2.id))
Sort Key: ((1 - matest2.id))
-> Seq Scan on public.matest2
Output: matest2.id, matest2.name, (1 - matest2.id)
-> Index Scan using matest3i on public.matest3
Output: matest3.id, matest3.name, (1 - matest3.id)
(13 rows)
select * from matest0 order by 1-id;
id | name
----+--------
6 | Test 6
5 | Test 5
4 | Test 4
3 | Test 3
2 | Test 2
1 | Test 1
(6 rows)
explain (verbose, costs off) select min(1-id) from matest0;
QUERY PLAN
--------------------------------------------------------------------------
Result
Output: $0
InitPlan 1 (returns $0)
-> Limit
Output: ((1 - matest0.id))
-> Result
Output: ((1 - matest0.id))
-> Merge Append
Sort Key: ((1 - matest0.id))
-> Index Scan using matest0i on public.matest0
Output: matest0.id, (1 - matest0.id)
Index Cond: ((1 - matest0.id) IS NOT NULL)
-> Index Scan using matest1i on public.matest1
Output: matest1.id, (1 - matest1.id)
Index Cond: ((1 - matest1.id) IS NOT NULL)
-> Sort
Output: matest2.id, ((1 - matest2.id))
Sort Key: ((1 - matest2.id))
-> Bitmap Heap Scan on public.matest2
Output: matest2.id, (1 - matest2.id)
Filter: ((1 - matest2.id) IS NOT NULL)
-> Bitmap Index Scan on matest2_pkey
-> Index Scan using matest3i on public.matest3
Output: matest3.id, (1 - matest3.id)
Index Cond: ((1 - matest3.id) IS NOT NULL)
(25 rows)
select min(1-id) from matest0;
min
-----
-5
(1 row)
reset enable_seqscan;
drop table matest0 cascade;
NOTICE: drop cascades to 3 other objects
DETAIL: drop cascades to table matest1
drop cascades to table matest2
drop cascades to table matest3
--
-- Check that use of an index with an extraneous column doesn't produce
-- a plan with extraneous sorting
--
create table matest0 (a int, b int, c int, d int);
create table matest1 () inherits(matest0);
create index matest0i on matest0 (b, c);
create index matest1i on matest1 (b, c);
set enable_nestloop = off; -- we want a plan with two MergeAppends
explain (costs off)
select t1.* from matest0 t1, matest0 t2
where t1.b = t2.b and t2.c = t2.d
order by t1.b limit 10;
QUERY PLAN
-------------------------------------------------------------------
Limit
-> Merge Join
Merge Cond: (t1.b = t2.b)
-> Merge Append
Sort Key: t1.b
-> Index Scan using matest0i on matest0 t1
-> Index Scan using matest1i on matest1 t1_1
-> Materialize
-> Merge Append
Sort Key: t2.b
-> Index Scan using matest0i on matest0 t2
Filter: (c = d)
-> Index Scan using matest1i on matest1 t2_1
Filter: (c = d)
(14 rows)
reset enable_nestloop;
drop table matest0 cascade;
NOTICE: drop cascades to table matest1
--
-- Test merge-append for UNION ALL append relations
--
set enable_seqscan = off;
set enable_indexscan = on;
set enable_bitmapscan = off;
-- Check handling of duplicated, constant, or volatile targetlist items
explain (costs off)
SELECT thousand, tenthous FROM tenk1
UNION ALL
SELECT thousand, thousand FROM tenk1
ORDER BY thousand, tenthous;
QUERY PLAN
-------------------------------------------------------------------------
Merge Append
Sort Key: tenk1.thousand, tenk1.tenthous
-> Index Only Scan using tenk1_thous_tenthous on tenk1
-> Sort
Sort Key: tenk1_1.thousand, tenk1_1.thousand
-> Index Only Scan using tenk1_thous_tenthous on tenk1 tenk1_1
(6 rows)
explain (costs off)
SELECT thousand, tenthous, thousand+tenthous AS x FROM tenk1
UNION ALL
SELECT 42, 42, hundred FROM tenk1
ORDER BY thousand, tenthous;
QUERY PLAN
------------------------------------------------------------------
Merge Append
Sort Key: tenk1.thousand, tenk1.tenthous
-> Index Only Scan using tenk1_thous_tenthous on tenk1
-> Sort
Sort Key: (42), (42)
-> Index Only Scan using tenk1_hundred on tenk1 tenk1_1
(6 rows)
explain (costs off)
SELECT thousand, tenthous FROM tenk1
UNION ALL
SELECT thousand, random()::integer FROM tenk1
ORDER BY thousand, tenthous;
QUERY PLAN
-------------------------------------------------------------------------
Merge Append
Sort Key: tenk1.thousand, tenk1.tenthous
-> Index Only Scan using tenk1_thous_tenthous on tenk1
-> Sort
Sort Key: tenk1_1.thousand, ((random())::integer)
-> Index Only Scan using tenk1_thous_tenthous on tenk1 tenk1_1
(6 rows)
-- Check min/max aggregate optimization
explain (costs off)
SELECT min(x) FROM
(SELECT unique1 AS x FROM tenk1 a
UNION ALL
SELECT unique2 AS x FROM tenk1 b) s;
QUERY PLAN
--------------------------------------------------------------------
Result
InitPlan 1 (returns $0)
-> Limit
-> Merge Append
Sort Key: a.unique1
-> Index Only Scan using tenk1_unique1 on tenk1 a
Index Cond: (unique1 IS NOT NULL)
-> Index Only Scan using tenk1_unique2 on tenk1 b
Index Cond: (unique2 IS NOT NULL)
(9 rows)
explain (costs off)
SELECT min(y) FROM
(SELECT unique1 AS x, unique1 AS y FROM tenk1 a
UNION ALL
SELECT unique2 AS x, unique2 AS y FROM tenk1 b) s;
QUERY PLAN
--------------------------------------------------------------------
Result
InitPlan 1 (returns $0)
-> Limit
-> Merge Append
Sort Key: a.unique1
-> Index Only Scan using tenk1_unique1 on tenk1 a
Index Cond: (unique1 IS NOT NULL)
-> Index Only Scan using tenk1_unique2 on tenk1 b
Index Cond: (unique2 IS NOT NULL)
(9 rows)
-- XXX planner doesn't recognize that index on unique2 is sufficiently sorted
explain (costs off)
SELECT x, y FROM
(SELECT thousand AS x, tenthous AS y FROM tenk1 a
UNION ALL
SELECT unique2 AS x, unique2 AS y FROM tenk1 b) s
ORDER BY x, y;
QUERY PLAN
-------------------------------------------------------------
Merge Append
Sort Key: a.thousand, a.tenthous
-> Index Only Scan using tenk1_thous_tenthous on tenk1 a
-> Sort
Sort Key: b.unique2, b.unique2
-> Index Only Scan using tenk1_unique2 on tenk1 b
(6 rows)
-- exercise rescan code path via a repeatedly-evaluated subquery
explain (costs off)
SELECT
ARRAY(SELECT f.i FROM (
(SELECT d + g.i FROM generate_series(4, 30, 3) d ORDER BY 1)
UNION ALL
(SELECT d + g.i FROM generate_series(0, 30, 5) d ORDER BY 1)
) f(i)
ORDER BY f.i LIMIT 10)
FROM generate_series(1, 3) g(i);
QUERY PLAN
----------------------------------------------------------------
Function Scan on generate_series g
SubPlan 1
-> Limit
-> Merge Append
Sort Key: ((d.d + g.i))
-> Sort
Sort Key: ((d.d + g.i))
-> Function Scan on generate_series d
-> Sort
Sort Key: ((d_1.d + g.i))
-> Function Scan on generate_series d_1
(11 rows)
SELECT
ARRAY(SELECT f.i FROM (
(SELECT d + g.i FROM generate_series(4, 30, 3) d ORDER BY 1)
UNION ALL
(SELECT d + g.i FROM generate_series(0, 30, 5) d ORDER BY 1)
) f(i)
ORDER BY f.i LIMIT 10)
FROM generate_series(1, 3) g(i);
array
------------------------------
{1,5,6,8,11,11,14,16,17,20}
{2,6,7,9,12,12,15,17,18,21}
{3,7,8,10,13,13,16,18,19,22}
(3 rows)
reset enable_seqscan;
reset enable_indexscan;
reset enable_bitmapscan;
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