mirror of
https://github.com/postgres/postgres.git
synced 2026-02-03 20:40:14 -05:00
344eed91e9
Commit a87c729153 already fixed the bug this
is checking for, but the regression test case it added didn't cover this
scenario. Since we managed to miss the fact that there was a bug at all,
it seems like a good idea to propagate the extra test case forward to HEAD.
319 lines
7.4 KiB
PL/PgSQL
319 lines
7.4 KiB
PL/PgSQL
--
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-- UNION (also INTERSECT, EXCEPT)
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--
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-- Simple UNION constructs
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SELECT 1 AS two UNION SELECT 2;
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SELECT 1 AS one UNION SELECT 1;
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SELECT 1 AS two UNION ALL SELECT 2;
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SELECT 1 AS two UNION ALL SELECT 1;
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SELECT 1 AS three UNION SELECT 2 UNION SELECT 3;
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SELECT 1 AS two UNION SELECT 2 UNION SELECT 2;
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SELECT 1 AS three UNION SELECT 2 UNION ALL SELECT 2;
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SELECT 1.1 AS two UNION SELECT 2.2;
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-- Mixed types
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SELECT 1.1 AS two UNION SELECT 2;
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SELECT 1 AS two UNION SELECT 2.2;
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SELECT 1 AS one UNION SELECT 1.0::float8;
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SELECT 1.1 AS two UNION ALL SELECT 2;
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SELECT 1.0::float8 AS two UNION ALL SELECT 1;
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SELECT 1.1 AS three UNION SELECT 2 UNION SELECT 3;
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SELECT 1.1::float8 AS two UNION SELECT 2 UNION SELECT 2.0::float8 ORDER BY 1;
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SELECT 1.1 AS three UNION SELECT 2 UNION ALL SELECT 2;
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SELECT 1.1 AS two UNION (SELECT 2 UNION ALL SELECT 2);
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--
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-- Try testing from tables...
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--
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SELECT f1 AS five FROM FLOAT8_TBL
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UNION
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SELECT f1 FROM FLOAT8_TBL
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ORDER BY 1;
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SELECT f1 AS ten FROM FLOAT8_TBL
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UNION ALL
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SELECT f1 FROM FLOAT8_TBL;
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SELECT f1 AS nine FROM FLOAT8_TBL
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UNION
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SELECT f1 FROM INT4_TBL
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ORDER BY 1;
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SELECT f1 AS ten FROM FLOAT8_TBL
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UNION ALL
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SELECT f1 FROM INT4_TBL;
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SELECT f1 AS five FROM FLOAT8_TBL
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WHERE f1 BETWEEN -1e6 AND 1e6
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UNION
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SELECT f1 FROM INT4_TBL
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WHERE f1 BETWEEN 0 AND 1000000;
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SELECT CAST(f1 AS char(4)) AS three FROM VARCHAR_TBL
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UNION
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SELECT f1 FROM CHAR_TBL
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ORDER BY 1;
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SELECT f1 AS three FROM VARCHAR_TBL
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UNION
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SELECT CAST(f1 AS varchar) FROM CHAR_TBL
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ORDER BY 1;
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SELECT f1 AS eight FROM VARCHAR_TBL
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UNION ALL
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SELECT f1 FROM CHAR_TBL;
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SELECT f1 AS five FROM TEXT_TBL
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UNION
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SELECT f1 FROM VARCHAR_TBL
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UNION
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SELECT TRIM(TRAILING FROM f1) FROM CHAR_TBL
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ORDER BY 1;
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--
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-- INTERSECT and EXCEPT
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--
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SELECT q2 FROM int8_tbl INTERSECT SELECT q1 FROM int8_tbl;
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SELECT q2 FROM int8_tbl INTERSECT ALL SELECT q1 FROM int8_tbl;
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SELECT q2 FROM int8_tbl EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1;
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SELECT q2 FROM int8_tbl EXCEPT ALL SELECT q1 FROM int8_tbl ORDER BY 1;
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SELECT q2 FROM int8_tbl EXCEPT ALL SELECT DISTINCT q1 FROM int8_tbl ORDER BY 1;
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SELECT q1 FROM int8_tbl EXCEPT SELECT q2 FROM int8_tbl;
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SELECT q1 FROM int8_tbl EXCEPT ALL SELECT q2 FROM int8_tbl;
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SELECT q1 FROM int8_tbl EXCEPT ALL SELECT DISTINCT q2 FROM int8_tbl;
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SELECT q1 FROM int8_tbl EXCEPT ALL SELECT q1 FROM int8_tbl FOR NO KEY UPDATE;
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--
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-- Mixed types
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--
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SELECT f1 FROM float8_tbl INTERSECT SELECT f1 FROM int4_tbl;
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SELECT f1 FROM float8_tbl EXCEPT SELECT f1 FROM int4_tbl ORDER BY 1;
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--
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-- Operator precedence and (((((extra))))) parentheses
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--
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SELECT q1 FROM int8_tbl INTERSECT SELECT q2 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl;
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SELECT q1 FROM int8_tbl INTERSECT (((SELECT q2 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl)));
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(((SELECT q1 FROM int8_tbl INTERSECT SELECT q2 FROM int8_tbl))) UNION ALL SELECT q2 FROM int8_tbl;
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SELECT q1 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1;
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SELECT q1 FROM int8_tbl UNION ALL (((SELECT q2 FROM int8_tbl EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1)));
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(((SELECT q1 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl))) EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1;
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--
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-- Subqueries with ORDER BY & LIMIT clauses
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--
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-- In this syntax, ORDER BY/LIMIT apply to the result of the EXCEPT
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SELECT q1,q2 FROM int8_tbl EXCEPT SELECT q2,q1 FROM int8_tbl
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ORDER BY q2,q1;
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-- This should fail, because q2 isn't a name of an EXCEPT output column
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SELECT q1 FROM int8_tbl EXCEPT SELECT q2 FROM int8_tbl ORDER BY q2 LIMIT 1;
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-- But this should work:
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SELECT q1 FROM int8_tbl EXCEPT (((SELECT q2 FROM int8_tbl ORDER BY q2 LIMIT 1)));
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--
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-- New syntaxes (7.1) permit new tests
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--
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(((((select * from int8_tbl)))));
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--
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-- Check handling of a case with unknown constants. We don't guarantee
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-- an undecorated constant will work in all cases, but historically this
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-- usage has worked, so test we don't break it.
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--
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SELECT a.f1 FROM (SELECT 'test' AS f1 FROM varchar_tbl) a
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UNION
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SELECT b.f1 FROM (SELECT f1 FROM varchar_tbl) b
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ORDER BY 1;
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-- This should fail, but it should produce an error cursor
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SELECT '3.4'::numeric UNION SELECT 'foo';
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--
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-- Test that expression-index constraints can be pushed down through
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-- UNION or UNION ALL
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--
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CREATE TEMP TABLE t1 (a text, b text);
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CREATE INDEX t1_ab_idx on t1 ((a || b));
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CREATE TEMP TABLE t2 (ab text primary key);
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INSERT INTO t1 VALUES ('a', 'b'), ('x', 'y');
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INSERT INTO t2 VALUES ('ab'), ('xy');
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set enable_seqscan = off;
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set enable_indexscan = on;
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set enable_bitmapscan = off;
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explain (costs off)
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SELECT * FROM
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(SELECT a || b AS ab FROM t1
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UNION ALL
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SELECT * FROM t2) t
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WHERE ab = 'ab';
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explain (costs off)
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SELECT * FROM
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(SELECT a || b AS ab FROM t1
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UNION
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SELECT * FROM t2) t
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WHERE ab = 'ab';
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--
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-- Test that ORDER BY for UNION ALL can be pushed down to inheritance
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-- children.
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--
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CREATE TEMP TABLE t1c (b text, a text);
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ALTER TABLE t1c INHERIT t1;
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CREATE TEMP TABLE t2c (primary key (ab)) INHERITS (t2);
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INSERT INTO t1c VALUES ('v', 'w'), ('c', 'd'), ('m', 'n'), ('e', 'f');
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INSERT INTO t2c VALUES ('vw'), ('cd'), ('mn'), ('ef');
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CREATE INDEX t1c_ab_idx on t1c ((a || b));
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set enable_seqscan = on;
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set enable_indexonlyscan = off;
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explain (costs off)
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SELECT * FROM
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(SELECT a || b AS ab FROM t1
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UNION ALL
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SELECT ab FROM t2) t
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ORDER BY 1 LIMIT 8;
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SELECT * FROM
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(SELECT a || b AS ab FROM t1
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UNION ALL
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SELECT ab FROM t2) t
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ORDER BY 1 LIMIT 8;
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reset enable_seqscan;
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reset enable_indexscan;
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reset enable_bitmapscan;
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-- This simpler variant of the above test has been observed to fail differently
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create table events (event_id int primary key);
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create table other_events (event_id int primary key);
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create table events_child () inherits (events);
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explain (costs off)
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select event_id
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from (select event_id from events
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union all
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select event_id from other_events) ss
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order by event_id;
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drop table events_child, events, other_events;
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reset enable_indexonlyscan;
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-- Test constraint exclusion of UNION ALL subqueries
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explain (costs off)
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SELECT * FROM
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(SELECT 1 AS t, * FROM tenk1 a
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UNION ALL
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SELECT 2 AS t, * FROM tenk1 b) c
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WHERE t = 2;
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-- Test that we push quals into UNION sub-selects only when it's safe
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explain (costs off)
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SELECT * FROM
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(SELECT 1 AS t, 2 AS x
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UNION
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SELECT 2 AS t, 4 AS x) ss
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WHERE x < 4;
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SELECT * FROM
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(SELECT 1 AS t, 2 AS x
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UNION
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SELECT 2 AS t, 4 AS x) ss
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WHERE x < 4;
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explain (costs off)
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SELECT * FROM
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(SELECT 1 AS t, generate_series(1,10) AS x
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UNION
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SELECT 2 AS t, 4 AS x) ss
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WHERE x < 4
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ORDER BY x;
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SELECT * FROM
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(SELECT 1 AS t, generate_series(1,10) AS x
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UNION
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SELECT 2 AS t, 4 AS x) ss
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WHERE x < 4
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ORDER BY x;
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explain (costs off)
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SELECT * FROM
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(SELECT 1 AS t, (random()*3)::int AS x
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UNION
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SELECT 2 AS t, 4 AS x) ss
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WHERE x > 3;
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SELECT * FROM
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(SELECT 1 AS t, (random()*3)::int AS x
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UNION
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SELECT 2 AS t, 4 AS x) ss
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WHERE x > 3;
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-- Test proper handling of parameterized appendrel paths when the
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-- potential join qual is expensive
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create function expensivefunc(int) returns int
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language plpgsql immutable strict cost 10000
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as $$begin return $1; end$$;
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create temp table t3 as select generate_series(-1000,1000) as x;
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create index t3i on t3 (expensivefunc(x));
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analyze t3;
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explain (costs off)
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select * from
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(select * from t3 a union all select * from t3 b) ss
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join int4_tbl on f1 = expensivefunc(x);
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select * from
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(select * from t3 a union all select * from t3 b) ss
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join int4_tbl on f1 = expensivefunc(x);
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drop table t3;
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drop function expensivefunc(int);
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