forked from huawei/openGauss-server
524 lines
20 KiB
SQL
524 lines
20 KiB
SQL
--
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-- Test inheritance features
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--
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CREATE TABLE a (aa TEXT);
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CREATE TABLE b (bb TEXT) INHERITS (a);
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CREATE TABLE c (cc TEXT) INHERITS (a);
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CREATE TABLE d (dd TEXT) INHERITS (b,c,a);
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INSERT INTO a(aa) VALUES('aaa');
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INSERT INTO a(aa) VALUES('aaaa');
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INSERT INTO a(aa) VALUES('aaaaa');
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INSERT INTO a(aa) VALUES('aaaaaa');
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INSERT INTO a(aa) VALUES('aaaaaaa');
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INSERT INTO a(aa) VALUES('aaaaaaaa');
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INSERT INTO b(aa) VALUES('bbb');
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INSERT INTO b(aa) VALUES('bbbb');
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INSERT INTO b(aa) VALUES('bbbbb');
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INSERT INTO b(aa) VALUES('bbbbbb');
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INSERT INTO b(aa) VALUES('bbbbbbb');
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INSERT INTO b(aa) VALUES('bbbbbbbb');
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INSERT INTO c(aa) VALUES('ccc');
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INSERT INTO c(aa) VALUES('cccc');
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INSERT INTO c(aa) VALUES('ccccc');
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INSERT INTO c(aa) VALUES('cccccc');
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INSERT INTO c(aa) VALUES('ccccccc');
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INSERT INTO c(aa) VALUES('cccccccc');
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INSERT INTO d(aa) VALUES('ddd');
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INSERT INTO d(aa) VALUES('dddd');
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INSERT INTO d(aa) VALUES('ddddd');
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INSERT INTO d(aa) VALUES('dddddd');
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INSERT INTO d(aa) VALUES('ddddddd');
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INSERT INTO d(aa) VALUES('dddddddd');
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SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
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SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
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UPDATE a SET aa='zzzz' WHERE aa='aaaa';
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UPDATE ONLY a SET aa='zzzzz' WHERE aa='aaaaa';
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UPDATE b SET aa='zzz' WHERE aa='aaa';
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UPDATE ONLY b SET aa='zzz' WHERE aa='aaa';
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UPDATE a SET aa='zzzzzz' WHERE aa LIKE 'aaa%';
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SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
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SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
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UPDATE b SET aa='new';
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SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
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SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
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UPDATE a SET aa='new';
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DELETE FROM ONLY c WHERE aa='new';
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SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
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SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
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DELETE FROM a;
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SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid;
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SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid;
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SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid;
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SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid;
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SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid;
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-- Confirm PRIMARY KEY adds NOT NULL constraint to child table
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CREATE TEMP TABLE z (b TEXT, PRIMARY KEY(aa, b)) inherits (a);
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INSERT INTO z VALUES (NULL, 'text'); -- should fail
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-- Check UPDATE with inherited target and an inherited source table
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create temp table foo(f1 int, f2 int);
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create temp table foo2(f3 int) inherits (foo);
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create temp table bar(f1 int, f2 int);
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create temp table bar2(f3 int) inherits (bar);
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insert into foo values(1,1);
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insert into foo values(3,3);
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insert into foo2 values(2,2,2);
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insert into foo2 values(3,3,3);
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insert into bar values(1,1);
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insert into bar values(2,2);
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insert into bar values(3,3);
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insert into bar values(4,4);
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insert into bar2 values(1,1,1);
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insert into bar2 values(2,2,2);
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insert into bar2 values(3,3,3);
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insert into bar2 values(4,4,4);
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update bar set f2 = f2 + 100 where f1 in (select f1 from foo);
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select tableoid::regclass::text as relname, bar.* from bar order by 1,2;
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-- Check UPDATE with inherited target and an appendrel subquery
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update bar set f2 = f2 + 100
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from
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( select f1 from foo union all select f1+3 from foo ) ss
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where bar.f1 = ss.f1;
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select tableoid::regclass::text as relname, bar.* from bar order by 1,2;
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/* Test multiple inheritance of column defaults */
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CREATE TABLE firstparent (tomorrow date default now()::date + 1);
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CREATE TABLE secondparent (tomorrow date default now() :: date + 1);
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CREATE TABLE jointchild () INHERITS (firstparent, secondparent); -- ok
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CREATE TABLE thirdparent (tomorrow date default now()::date - 1);
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CREATE TABLE otherchild () INHERITS (firstparent, thirdparent); -- not ok
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CREATE TABLE otherchild (tomorrow date default now())
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INHERITS (firstparent, thirdparent); -- ok, child resolves ambiguous default
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DROP TABLE firstparent, secondparent, jointchild, thirdparent, otherchild;
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-- Test changing the type of inherited columns
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insert into d values('test','one','two','three');
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alter table a alter column aa type integer using bit_length(aa);
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select * from d;
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-- check that oid column is handled properly during alter table inherit
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create table oid_parent (a int) with oids;
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create table oid_child () inherits (oid_parent);
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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drop table oid_child;
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create table oid_child (a int) without oids;
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alter table oid_child inherit oid_parent; -- fail
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alter table oid_child set with oids;
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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alter table oid_child inherit oid_parent;
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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alter table oid_child set without oids; -- fail
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alter table oid_parent set without oids;
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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alter table oid_child set without oids;
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select attinhcount, attislocal from pg_attribute
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where attrelid = 'oid_child'::regclass and attname = 'oid';
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drop table oid_parent cascade;
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-- Test non-inheritable parent constraints
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create table p1(ff1 int);
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alter table p1 add constraint p1chk check (ff1 > 0) no inherit;
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alter table p1 add constraint p2chk check (ff1 > 10);
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-- connoinherit should be true for NO INHERIT constraint
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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;
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-- Test that child does not inherit NO INHERIT constraints
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create table c1 () inherits (p1);
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\d p1
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\d c1
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-- Test that child does not override inheritable constraints of the parent
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create table c2 (constraint p2chk check (ff1 > 10) no inherit) inherits (p1); --fails
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drop table p1 cascade;
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-- Tests for casting between the rowtypes of parent and child
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-- tables. See the pgsql-hackers thread beginning Dec. 4/04
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create table base (i integer);
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create table derived () inherits (base);
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insert into derived (i) values (0);
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select derived::base from derived;
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drop table derived;
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drop table base;
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create table p1(ff1 int);
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create table p2(f1 text);
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create function p2text(p2) returns text as 'select $1.f1' language sql;
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create table c1(f3 int) inherits(p1,p2);
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insert into c1 values(123456789, 'hi', 42);
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select p2text(c1.*) from c1;
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drop function p2text(p2);
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drop table c1;
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drop table p2;
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drop table p1;
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CREATE TABLE ac (aa TEXT);
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alter table ac add constraint ac_check check (aa is not null);
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CREATE TABLE bc (bb TEXT) INHERITS (ac);
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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;
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insert into ac (aa) values (NULL);
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insert into bc (aa) values (NULL);
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alter table bc drop constraint ac_check; -- fail, disallowed
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alter table ac drop constraint ac_check;
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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;
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-- try the unnamed-constraint case
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alter table ac add check (aa is not null);
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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;
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insert into ac (aa) values (NULL);
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insert into bc (aa) values (NULL);
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alter table bc drop constraint ac_aa_check; -- fail, disallowed
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alter table ac drop constraint ac_aa_check;
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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;
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alter table ac add constraint ac_check check (aa is not null);
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alter table bc no inherit ac;
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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;
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alter table bc drop constraint ac_check;
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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;
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alter table ac drop constraint ac_check;
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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;
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drop table bc;
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drop table ac;
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create table ac (a int constraint check_a check (a <> 0));
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create table bc (a int constraint check_a check (a <> 0), b int constraint check_b check (b <> 0)) inherits (ac);
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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;
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drop table bc;
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drop table ac;
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create table ac (a int constraint check_a check (a <> 0));
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create table bc (b int constraint check_b check (b <> 0));
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create table cc (c int constraint check_c check (c <> 0)) inherits (ac, bc);
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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;
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alter table cc no inherit bc;
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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;
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drop table cc;
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drop table bc;
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drop table ac;
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create table p1(f1 int);
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create table p2(f2 int);
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create table c1(f3 int) inherits(p1,p2);
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insert into c1 values(1,-1,2);
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alter table p2 add constraint cc check (f2>0); -- fail
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alter table p2 add check (f2>0); -- check it without a name, too
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delete from c1;
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insert into c1 values(1,1,2);
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alter table p2 add check (f2>0);
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insert into c1 values(1,-1,2); -- fail
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create table c2(f3 int) inherits(p1,p2);
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\d c2
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create table c3 (f4 int) inherits(c1,c2);
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\d c3
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drop table p1 cascade;
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drop table p2 cascade;
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create table pp1 (f1 int);
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create table cc1 (f2 text, f3 int) inherits (pp1);
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alter table pp1 add column a1 int check (a1 > 0);
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\d cc1
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create table cc2(f4 float) inherits(pp1,cc1);
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\d cc2
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alter table pp1 add column a2 int check (a2 > 0);
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\d cc2
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drop table pp1 cascade;
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-- Test for renaming in simple multiple inheritance
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CREATE TABLE inht1 (a int, b int);
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CREATE TABLE inhs1 (b int, c int);
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CREATE TABLE inhts (d int) INHERITS (inht1, inhs1);
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ALTER TABLE inht1 RENAME a TO aa;
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ALTER TABLE inht1 RENAME b TO bb; -- to be failed
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ALTER TABLE inhts RENAME aa TO aaa; -- to be failed
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ALTER TABLE inhts RENAME d TO dd;
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\d+ inhts
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DROP TABLE inhts;
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-- Test for renaming in diamond inheritance
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CREATE TABLE inht2 (x int) INHERITS (inht1);
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CREATE TABLE inht3 (y int) INHERITS (inht1);
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CREATE TABLE inht4 (z int) INHERITS (inht2, inht3);
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ALTER TABLE inht1 RENAME aa TO aaa;
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\d+ inht4
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CREATE TABLE inhts (d int) INHERITS (inht2, inhs1);
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ALTER TABLE inht1 RENAME aaa TO aaaa;
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ALTER TABLE inht1 RENAME b TO bb; -- to be failed
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\d+ inhts
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WITH RECURSIVE r AS (
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SELECT 'inht1'::regclass AS inhrelid
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UNION ALL
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SELECT c.inhrelid FROM pg_inherits c, r WHERE r.inhrelid = c.inhparent
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)
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SELECT a.attrelid::regclass, a.attname, a.attinhcount, e.expected
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FROM (SELECT inhrelid, count(*) AS expected FROM pg_inherits
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WHERE inhparent IN (SELECT inhrelid FROM r) GROUP BY inhrelid) e
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JOIN pg_attribute a ON e.inhrelid = a.attrelid WHERE NOT attislocal
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ORDER BY a.attrelid::regclass::name, a.attnum;
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DROP TABLE inht1, inhs1 CASCADE;
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-- Test non-inheritable indices [UNIQUE, EXCLUDE] contraints
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CREATE TABLE test_constraints (id int, val1 varchar, val2 int, UNIQUE(val1, val2));
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CREATE TABLE test_constraints_inh () INHERITS (test_constraints);
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\d+ test_constraints
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ALTER TABLE ONLY test_constraints DROP CONSTRAINT test_constraints_val1_val2_key;
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\d+ test_constraints
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\d+ test_constraints_inh
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DROP TABLE test_constraints_inh;
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DROP TABLE test_constraints;
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CREATE TABLE test_ex_constraints (
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c circle,
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EXCLUDE USING gist (c WITH &&)
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);
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CREATE TABLE test_ex_constraints_inh () INHERITS (test_ex_constraints);
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\d+ test_ex_constraints
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ALTER TABLE test_ex_constraints DROP CONSTRAINT test_ex_constraints_c_excl;
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\d+ test_ex_constraints
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\d+ test_ex_constraints_inh
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DROP TABLE test_ex_constraints_inh;
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DROP TABLE test_ex_constraints;
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-- Test non-inheritable foreign key contraints
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CREATE TABLE test_primary_constraints(id int PRIMARY KEY);
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CREATE TABLE test_foreign_constraints(id1 int REFERENCES test_primary_constraints(id));
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CREATE TABLE test_foreign_constraints_inh () INHERITS (test_foreign_constraints);
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\d+ test_primary_constraints
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\d+ test_foreign_constraints
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ALTER TABLE test_foreign_constraints DROP CONSTRAINT test_foreign_constraints_id1_fkey;
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\d+ test_foreign_constraints
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\d+ test_foreign_constraints_inh
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DROP TABLE test_foreign_constraints_inh;
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DROP TABLE test_foreign_constraints;
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DROP TABLE test_primary_constraints;
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-- Test that parent and child CHECK constraints can be created in either order
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create table p1(f1 int);
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create table p1_c1() inherits(p1);
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alter table p1 add constraint inh_check_constraint1 check (f1 > 0);
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alter table p1_c1 add constraint inh_check_constraint1 check (f1 > 0);
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alter table p1_c1 add constraint inh_check_constraint2 check (f1 < 10);
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alter table p1 add constraint inh_check_constraint2 check (f1 < 10);
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select conrelid::regclass::text as relname, conname, conislocal, coninhcount
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from pg_constraint where conname like 'inh\_check\_constraint%'
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order by 1, 2;
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drop table p1 cascade;
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-- Test that a valid child can have not-valid parent, but not vice versa
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create table invalid_check_con(f1 int);
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create table invalid_check_con_child() inherits(invalid_check_con);
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alter table invalid_check_con_child add constraint inh_check_constraint check(f1 > 0) not valid;
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alter table invalid_check_con add constraint inh_check_constraint check(f1 > 0); -- fail
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alter table invalid_check_con_child drop constraint inh_check_constraint;
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insert into invalid_check_con values(0);
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alter table invalid_check_con_child add constraint inh_check_constraint check(f1 > 0);
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alter table invalid_check_con add constraint inh_check_constraint check(f1 > 0) not valid;
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|
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insert into invalid_check_con values(0); -- fail
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insert into invalid_check_con_child values(0); -- fail
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|
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select conrelid::regclass::text as relname, conname,
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convalidated, conislocal, coninhcount, connoinherit
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from pg_constraint where conname like 'inh\_check\_constraint%'
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order by 1, 2;
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-- We don't drop the invalid_check_con* tables, to test dump/reload with
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|
|
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--
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|
-- Test parameterized append plans for inheritance trees
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|
--
|
|
|
|
create temp table patest0 (id, x) as
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select x, x from generate_series(0,1000) x;
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|
create temp table patest1() inherits (patest0);
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|
insert into patest1
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|
select x, x from generate_series(0,1000) x;
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|
create temp table patest2() inherits (patest0);
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|
insert into patest2
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|
select x, x from generate_series(0,1000) x;
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|
create index patest0i on patest0(id);
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|
create index patest1i on patest1(id);
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|
create index patest2i on patest2(id);
|
|
analyze patest0;
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|
analyze patest1;
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|
analyze patest2;
|
|
|
|
explain (costs off)
|
|
select * from patest0 join (select f1 from int4_tbl limit 1) ss on id = f1;
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|
select * from patest0 join (select f1 from int4_tbl limit 1) ss on id = f1;
|
|
|
|
drop index patest2i;
|
|
|
|
explain (costs off)
|
|
select * from patest0 join (select f1 from int4_tbl limit 1) ss on id = f1;
|
|
select * from patest0 join (select f1 from int4_tbl limit 1) ss on id = f1;
|
|
|
|
drop table patest0 cascade;
|
|
|
|
--
|
|
-- 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);
|
|
create table matest2 (id integer primary key) inherits (matest0);
|
|
create table matest3 (id integer primary key) inherits (matest0);
|
|
|
|
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;
|
|
select * from matest0 order by 1-id;
|
|
explain (verbose, costs off) select min(1-id) from matest0;
|
|
select min(1-id) from matest0;
|
|
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;
|
|
select * from matest0 order by 1-id;
|
|
explain (verbose, costs off) select min(1-id) from matest0;
|
|
select min(1-id) from matest0;
|
|
reset enable_seqscan;
|
|
|
|
drop table matest0 cascade;
|
|
|
|
--
|
|
-- 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;
|
|
|
|
explain (costs off)
|
|
SELECT thousand, tenthous, thousand+tenthous AS x FROM tenk1
|
|
UNION ALL
|
|
SELECT 42, 42, hundred FROM tenk1
|
|
ORDER BY thousand, tenthous;
|
|
|
|
explain (costs off)
|
|
SELECT thousand, tenthous FROM tenk1
|
|
UNION ALL
|
|
SELECT thousand, random()::integer FROM tenk1
|
|
ORDER BY thousand, tenthous;
|
|
|
|
-- 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;
|
|
|
|
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;
|
|
|
|
-- 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;
|
|
|
|
reset enable_seqscan;
|
|
reset enable_indexscan;
|
|
reset enable_bitmapscan;
|