553 lines
17 KiB
PL/PgSQL
553 lines
17 KiB
PL/PgSQL
--
|
|
-- UNION (also INTERSECT, EXCEPT)
|
|
--
|
|
|
|
-- Simple UNION constructs
|
|
|
|
SELECT 1 AS two UNION SELECT 2 ORDER BY 1;
|
|
|
|
SELECT 1 AS one UNION SELECT 1 ORDER BY 1;
|
|
|
|
SELECT 1 AS two UNION ALL SELECT 2;
|
|
|
|
SELECT 1 AS two UNION ALL SELECT 1;
|
|
|
|
SELECT 1 AS three UNION SELECT 2 UNION SELECT 3 ORDER BY 1;
|
|
|
|
SELECT 1 AS two UNION SELECT 2 UNION SELECT 2 ORDER BY 1;
|
|
|
|
SELECT 1 AS three UNION SELECT 2 UNION ALL SELECT 2 ORDER BY 1;
|
|
|
|
SELECT 1.1 AS two UNION SELECT 2.2 ORDER BY 1;
|
|
|
|
-- Mixed types
|
|
|
|
SELECT 1.1 AS two UNION SELECT 2 ORDER BY 1;
|
|
|
|
SELECT 1 AS two UNION SELECT 2.2 ORDER BY 1;
|
|
|
|
SELECT 1 AS one UNION SELECT 1.0::float8 ORDER BY 1;
|
|
|
|
SELECT 1.1 AS two UNION ALL SELECT 2 ORDER BY 1;
|
|
|
|
SELECT 1.0::float8 AS two UNION ALL SELECT 1 ORDER BY 1;
|
|
|
|
SELECT 1.1 AS three UNION SELECT 2 UNION SELECT 3 ORDER BY 1;
|
|
|
|
SELECT 1.1::float8 AS two UNION SELECT 2 UNION SELECT 2.0::float8 ORDER BY 1;
|
|
|
|
SELECT 1.1 AS three UNION SELECT 2 UNION ALL SELECT 2 ORDER BY 1;
|
|
|
|
SELECT 1.1 AS two UNION (SELECT 2 UNION ALL SELECT 2) ORDER BY 1;
|
|
|
|
--
|
|
-- Try testing from tables...
|
|
--
|
|
|
|
SELECT f1 AS five FROM FLOAT8_TBL
|
|
UNION
|
|
SELECT f1 FROM FLOAT8_TBL
|
|
ORDER BY 1;
|
|
|
|
SELECT f1 AS ten FROM FLOAT8_TBL
|
|
UNION ALL
|
|
SELECT f1 FROM FLOAT8_TBL;
|
|
|
|
SELECT f1 AS nine FROM FLOAT8_TBL
|
|
UNION
|
|
SELECT f1 FROM INT4_TBL
|
|
ORDER BY 1;
|
|
|
|
SELECT f1 AS ten FROM FLOAT8_TBL
|
|
UNION ALL
|
|
SELECT f1 FROM INT4_TBL;
|
|
|
|
SELECT f1 AS five FROM FLOAT8_TBL
|
|
WHERE f1 BETWEEN -1e6 AND 1e6
|
|
UNION
|
|
SELECT f1 FROM INT4_TBL
|
|
WHERE f1 BETWEEN 0 AND 1000000
|
|
ORDER BY 1;
|
|
|
|
SELECT CAST(f1 AS char(4)) AS three FROM VARCHAR_TBL
|
|
UNION
|
|
SELECT f1 FROM CHAR_TBL
|
|
ORDER BY 1;
|
|
|
|
SELECT f1 AS three FROM VARCHAR_TBL
|
|
UNION
|
|
SELECT CAST(f1 AS varchar) FROM CHAR_TBL
|
|
ORDER BY 1;
|
|
|
|
SELECT f1 AS eight FROM VARCHAR_TBL
|
|
UNION ALL
|
|
SELECT f1 FROM CHAR_TBL;
|
|
|
|
SELECT f1 AS five FROM TEXT_TBL
|
|
UNION
|
|
SELECT f1 FROM VARCHAR_TBL
|
|
UNION
|
|
SELECT TRIM(TRAILING FROM f1) FROM CHAR_TBL
|
|
ORDER BY 1;
|
|
|
|
--
|
|
-- INTERSECT and EXCEPT
|
|
--
|
|
|
|
SELECT q2 FROM int8_tbl INTERSECT SELECT q1 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q2 FROM int8_tbl INTERSECT ALL SELECT q1 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q2 FROM int8_tbl EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q2 FROM int8_tbl EXCEPT ALL SELECT q1 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q2 FROM int8_tbl EXCEPT ALL SELECT DISTINCT q1 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q1 FROM int8_tbl EXCEPT SELECT q2 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q1 FROM int8_tbl EXCEPT ALL SELECT q2 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q1 FROM int8_tbl EXCEPT ALL SELECT DISTINCT q2 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q1 FROM int8_tbl EXCEPT ALL SELECT q1 FROM int8_tbl FOR NO KEY UPDATE;
|
|
|
|
-- nested cases
|
|
(SELECT 1,2,3 UNION SELECT 4,5,6) INTERSECT SELECT 4,5,6;
|
|
(SELECT 1,2,3 UNION SELECT 4,5,6 ORDER BY 1,2) INTERSECT SELECT 4,5,6;
|
|
(SELECT 1,2,3 UNION SELECT 4,5,6) EXCEPT SELECT 4,5,6;
|
|
(SELECT 1,2,3 UNION SELECT 4,5,6 ORDER BY 1,2) EXCEPT SELECT 4,5,6;
|
|
|
|
-- exercise both hashed and sorted implementations of UNION/INTERSECT/EXCEPT
|
|
|
|
set enable_hashagg to on;
|
|
|
|
explain (costs off)
|
|
select count(*) from
|
|
( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
|
|
select count(*) from
|
|
( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
|
|
|
|
explain (costs off)
|
|
select count(*) from
|
|
( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
|
|
select count(*) from
|
|
( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
|
|
|
|
explain (costs off)
|
|
select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
|
|
select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
|
|
|
|
set enable_hashagg to off;
|
|
|
|
explain (costs off)
|
|
select count(*) from
|
|
( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
|
|
select count(*) from
|
|
( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
|
|
|
|
explain (costs off)
|
|
select count(*) from
|
|
( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
|
|
select count(*) from
|
|
( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
|
|
|
|
explain (costs off)
|
|
select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
|
|
select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
|
|
|
|
reset enable_hashagg;
|
|
|
|
-- non-hashable type
|
|
set enable_hashagg to on;
|
|
|
|
explain (costs off)
|
|
select x from (values (100::money), (200::money)) _(x) union select x from (values (100::money), (300::money)) _(x);
|
|
|
|
set enable_hashagg to off;
|
|
|
|
explain (costs off)
|
|
select x from (values (100::money), (200::money)) _(x) union select x from (values (100::money), (300::money)) _(x);
|
|
|
|
reset enable_hashagg;
|
|
|
|
-- arrays
|
|
set enable_hashagg to on;
|
|
|
|
explain (costs off)
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
explain (costs off)
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
explain (costs off)
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
|
|
-- non-hashable type
|
|
explain (costs off)
|
|
select x from (values (array[100::money]), (array[200::money])) _(x) union select x from (values (array[100::money]), (array[300::money])) _(x);
|
|
select x from (values (array[100::money]), (array[200::money])) _(x) union select x from (values (array[100::money]), (array[300::money])) _(x);
|
|
|
|
set enable_hashagg to off;
|
|
|
|
explain (costs off)
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
explain (costs off)
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
explain (costs off)
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
|
|
|
reset enable_hashagg;
|
|
|
|
-- records
|
|
set enable_hashagg to on;
|
|
|
|
explain (costs off)
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
explain (costs off)
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
explain (costs off)
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
|
|
-- non-hashable type
|
|
|
|
-- With an anonymous row type, the typcache does not report that the
|
|
-- type is hashable. (Otherwise, this would fail at execution time.)
|
|
explain (costs off)
|
|
select x from (values (row(100::money)), (row(200::money))) _(x) union select x from (values (row(100::money)), (row(300::money))) _(x);
|
|
select x from (values (row(100::money)), (row(200::money))) _(x) union select x from (values (row(100::money)), (row(300::money))) _(x);
|
|
|
|
-- With a defined row type, the typcache can inspect the type's fields
|
|
-- for hashability.
|
|
create type ct1 as (f1 money);
|
|
explain (costs off)
|
|
select x from (values (row(100::money)::ct1), (row(200::money)::ct1)) _(x) union select x from (values (row(100::money)::ct1), (row(300::money)::ct1)) _(x);
|
|
select x from (values (row(100::money)::ct1), (row(200::money)::ct1)) _(x) union select x from (values (row(100::money)::ct1), (row(300::money)::ct1)) _(x);
|
|
drop type ct1;
|
|
|
|
set enable_hashagg to off;
|
|
|
|
explain (costs off)
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
explain (costs off)
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
explain (costs off)
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
|
|
|
reset enable_hashagg;
|
|
|
|
--
|
|
-- Mixed types
|
|
--
|
|
|
|
SELECT f1 FROM float8_tbl INTERSECT SELECT f1 FROM int4_tbl ORDER BY 1;
|
|
|
|
SELECT f1 FROM float8_tbl EXCEPT SELECT f1 FROM int4_tbl ORDER BY 1;
|
|
|
|
--
|
|
-- Operator precedence and (((((extra))))) parentheses
|
|
--
|
|
|
|
SELECT q1 FROM int8_tbl INTERSECT SELECT q2 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q1 FROM int8_tbl INTERSECT (((SELECT q2 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl))) ORDER BY 1;
|
|
|
|
(((SELECT q1 FROM int8_tbl INTERSECT SELECT q2 FROM int8_tbl ORDER BY 1))) UNION ALL SELECT q2 FROM int8_tbl;
|
|
|
|
SELECT q1 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1;
|
|
|
|
SELECT q1 FROM int8_tbl UNION ALL (((SELECT q2 FROM int8_tbl EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1)));
|
|
|
|
(((SELECT q1 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl))) EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1;
|
|
|
|
--
|
|
-- Subqueries with ORDER BY & LIMIT clauses
|
|
--
|
|
|
|
-- In this syntax, ORDER BY/LIMIT apply to the result of the EXCEPT
|
|
SELECT q1,q2 FROM int8_tbl EXCEPT SELECT q2,q1 FROM int8_tbl
|
|
ORDER BY q2,q1;
|
|
|
|
-- This should fail, because q2 isn't a name of an EXCEPT output column
|
|
SELECT q1 FROM int8_tbl EXCEPT SELECT q2 FROM int8_tbl ORDER BY q2 LIMIT 1;
|
|
|
|
-- But this should work:
|
|
SELECT q1 FROM int8_tbl EXCEPT (((SELECT q2 FROM int8_tbl ORDER BY q2 LIMIT 1))) ORDER BY 1;
|
|
|
|
--
|
|
-- New syntaxes (7.1) permit new tests
|
|
--
|
|
|
|
(((((select * from int8_tbl)))));
|
|
|
|
--
|
|
-- Check behavior with empty select list (allowed since 9.4)
|
|
--
|
|
|
|
select union select;
|
|
select intersect select;
|
|
select except select;
|
|
|
|
-- check hashed implementation
|
|
set enable_hashagg = true;
|
|
set enable_sort = false;
|
|
|
|
explain (costs off)
|
|
select from generate_series(1,5) union select from generate_series(1,3);
|
|
explain (costs off)
|
|
select from generate_series(1,5) intersect select from generate_series(1,3);
|
|
|
|
select from generate_series(1,5) union select from generate_series(1,3);
|
|
select from generate_series(1,5) union all select from generate_series(1,3);
|
|
select from generate_series(1,5) intersect select from generate_series(1,3);
|
|
select from generate_series(1,5) intersect all select from generate_series(1,3);
|
|
select from generate_series(1,5) except select from generate_series(1,3);
|
|
select from generate_series(1,5) except all select from generate_series(1,3);
|
|
|
|
-- check sorted implementation
|
|
set enable_hashagg = false;
|
|
set enable_sort = true;
|
|
|
|
explain (costs off)
|
|
select from generate_series(1,5) union select from generate_series(1,3);
|
|
explain (costs off)
|
|
select from generate_series(1,5) intersect select from generate_series(1,3);
|
|
|
|
select from generate_series(1,5) union select from generate_series(1,3);
|
|
select from generate_series(1,5) union all select from generate_series(1,3);
|
|
select from generate_series(1,5) intersect select from generate_series(1,3);
|
|
select from generate_series(1,5) intersect all select from generate_series(1,3);
|
|
select from generate_series(1,5) except select from generate_series(1,3);
|
|
select from generate_series(1,5) except all select from generate_series(1,3);
|
|
|
|
reset enable_hashagg;
|
|
reset enable_sort;
|
|
|
|
--
|
|
-- Check handling of a case with unknown constants. We don't guarantee
|
|
-- an undecorated constant will work in all cases, but historically this
|
|
-- usage has worked, so test we don't break it.
|
|
--
|
|
|
|
SELECT a.f1 FROM (SELECT 'test' AS f1 FROM varchar_tbl) a
|
|
UNION
|
|
SELECT b.f1 FROM (SELECT f1 FROM varchar_tbl) b
|
|
ORDER BY 1;
|
|
|
|
-- This should fail, but it should produce an error cursor
|
|
SELECT '3.4'::numeric UNION SELECT 'foo';
|
|
|
|
--
|
|
-- Test that expression-index constraints can be pushed down through
|
|
-- UNION or UNION ALL
|
|
--
|
|
|
|
CREATE TEMP TABLE t1 (a text, b text);
|
|
CREATE INDEX t1_ab_idx on t1 ((a || b));
|
|
CREATE TEMP TABLE t2 (ab text primary key);
|
|
INSERT INTO t1 VALUES ('a', 'b'), ('x', 'y');
|
|
INSERT INTO t2 VALUES ('ab'), ('xy');
|
|
|
|
set enable_seqscan = off;
|
|
set enable_indexscan = on;
|
|
set enable_bitmapscan = off;
|
|
|
|
explain (costs off)
|
|
SELECT * FROM
|
|
(SELECT a || b AS ab FROM t1
|
|
UNION ALL
|
|
SELECT * FROM t2) t
|
|
WHERE ab = 'ab';
|
|
|
|
explain (costs off)
|
|
SELECT * FROM
|
|
(SELECT a || b AS ab FROM t1
|
|
UNION
|
|
SELECT * FROM t2) t
|
|
WHERE ab = 'ab';
|
|
|
|
--
|
|
-- Test that ORDER BY for UNION ALL can be pushed down to inheritance
|
|
-- children.
|
|
--
|
|
|
|
CREATE TEMP TABLE t1c (b text, a text);
|
|
ALTER TABLE t1c INHERIT t1;
|
|
CREATE TEMP TABLE t2c (primary key (ab)) INHERITS (t2);
|
|
INSERT INTO t1c VALUES ('v', 'w'), ('c', 'd'), ('m', 'n'), ('e', 'f');
|
|
INSERT INTO t2c VALUES ('vw'), ('cd'), ('mn'), ('ef');
|
|
CREATE INDEX t1c_ab_idx on t1c ((a || b));
|
|
|
|
set enable_seqscan = on;
|
|
set enable_indexonlyscan = off;
|
|
|
|
explain (costs off)
|
|
SELECT * FROM
|
|
(SELECT a || b AS ab FROM t1
|
|
UNION ALL
|
|
SELECT ab FROM t2) t
|
|
ORDER BY 1 LIMIT 8;
|
|
|
|
SELECT * FROM
|
|
(SELECT a || b AS ab FROM t1
|
|
UNION ALL
|
|
SELECT ab FROM t2) t
|
|
ORDER BY 1 LIMIT 8;
|
|
|
|
reset enable_seqscan;
|
|
reset enable_indexscan;
|
|
reset enable_bitmapscan;
|
|
|
|
-- This simpler variant of the above test has been observed to fail differently
|
|
|
|
create table events (event_id int primary key);
|
|
create table other_events (event_id int primary key);
|
|
create table events_child () inherits (events);
|
|
|
|
explain (costs off)
|
|
select event_id
|
|
from (select event_id from events
|
|
union all
|
|
select event_id from other_events) ss
|
|
order by event_id;
|
|
|
|
drop table events_child, events, other_events;
|
|
|
|
reset enable_indexonlyscan;
|
|
|
|
-- Test constraint exclusion of UNION ALL subqueries
|
|
explain (costs off)
|
|
SELECT * FROM
|
|
(SELECT 1 AS t, * FROM tenk1 a
|
|
UNION ALL
|
|
SELECT 2 AS t, * FROM tenk1 b) c
|
|
WHERE t = 2;
|
|
|
|
-- Test that we push quals into UNION sub-selects only when it's safe
|
|
explain (costs off)
|
|
SELECT * FROM
|
|
(SELECT 1 AS t, 2 AS x
|
|
UNION
|
|
SELECT 2 AS t, 4 AS x) ss
|
|
WHERE x < 4
|
|
ORDER BY x;
|
|
|
|
SELECT * FROM
|
|
(SELECT 1 AS t, 2 AS x
|
|
UNION
|
|
SELECT 2 AS t, 4 AS x) ss
|
|
WHERE x < 4
|
|
ORDER BY x;
|
|
|
|
explain (costs off)
|
|
SELECT * FROM
|
|
(SELECT 1 AS t, generate_series(1,10) AS x
|
|
UNION
|
|
SELECT 2 AS t, 4 AS x) ss
|
|
WHERE x < 4
|
|
ORDER BY x;
|
|
|
|
SELECT * FROM
|
|
(SELECT 1 AS t, generate_series(1,10) AS x
|
|
UNION
|
|
SELECT 2 AS t, 4 AS x) ss
|
|
WHERE x < 4
|
|
ORDER BY x;
|
|
|
|
explain (costs off)
|
|
SELECT * FROM
|
|
(SELECT 1 AS t, (random()*3)::int AS x
|
|
UNION
|
|
SELECT 2 AS t, 4 AS x) ss
|
|
WHERE x > 3
|
|
ORDER BY x;
|
|
|
|
SELECT * FROM
|
|
(SELECT 1 AS t, (random()*3)::int AS x
|
|
UNION
|
|
SELECT 2 AS t, 4 AS x) ss
|
|
WHERE x > 3
|
|
ORDER BY x;
|
|
|
|
-- Test cases where the native ordering of a sub-select has more pathkeys
|
|
-- than the outer query cares about
|
|
explain (costs off)
|
|
select distinct q1 from
|
|
(select distinct * from int8_tbl i81
|
|
union all
|
|
select distinct * from int8_tbl i82) ss
|
|
where q2 = q2;
|
|
|
|
select distinct q1 from
|
|
(select distinct * from int8_tbl i81
|
|
union all
|
|
select distinct * from int8_tbl i82) ss
|
|
where q2 = q2;
|
|
|
|
explain (costs off)
|
|
select distinct q1 from
|
|
(select distinct * from int8_tbl i81
|
|
union all
|
|
select distinct * from int8_tbl i82) ss
|
|
where -q1 = q2;
|
|
|
|
select distinct q1 from
|
|
(select distinct * from int8_tbl i81
|
|
union all
|
|
select distinct * from int8_tbl i82) ss
|
|
where -q1 = q2;
|
|
|
|
-- Test proper handling of parameterized appendrel paths when the
|
|
-- potential join qual is expensive
|
|
create function expensivefunc(int) returns int
|
|
language plpgsql immutable strict cost 10000
|
|
as $$begin return $1; end$$;
|
|
|
|
create temp table t3 as select generate_series(-1000,1000) as x;
|
|
create index t3i on t3 (expensivefunc(x));
|
|
analyze t3;
|
|
|
|
explain (costs off)
|
|
select * from
|
|
(select * from t3 a union all select * from t3 b) ss
|
|
join int4_tbl on f1 = expensivefunc(x);
|
|
select * from
|
|
(select * from t3 a union all select * from t3 b) ss
|
|
join int4_tbl on f1 = expensivefunc(x);
|
|
|
|
drop table t3;
|
|
drop function expensivefunc(int);
|
|
|
|
-- Test handling of appendrel quals that const-simplify into an AND
|
|
explain (costs off)
|
|
select * from
|
|
(select *, 0 as x from int8_tbl a
|
|
union all
|
|
select *, 1 as x from int8_tbl b) ss
|
|
where (x = 0) or (q1 >= q2 and q1 <= q2);
|
|
select * from
|
|
(select *, 0 as x from int8_tbl a
|
|
union all
|
|
select *, 1 as x from int8_tbl b) ss
|
|
where (x = 0) or (q1 >= q2 and q1 <= q2);
|
|
|
|
--
|
|
-- Test the planner's ability to produce cheap startup plans with Append nodes
|
|
--
|
|
|
|
-- Ensure we get a Nested Loop join between tenk1 and tenk2
|
|
explain (costs off)
|
|
select t1.unique1 from tenk1 t1
|
|
inner join tenk2 t2 on t1.tenthous = t2.tenthous
|
|
union all
|
|
(values(1)) limit 1; |