Adding upstream version 13.4.upstream/13.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1054 insertions, 0 deletions

diff --git a/src/test/regress/expected/union.out b/src/test/regress/expected/union.out
new file mode 100644
index 0000000..6e72e92
--- /dev/null
+++ b/src/test/regress/expected/union.out
@@ -0,0 +1,1054 @@
+--
+-- UNION (also INTERSECT, EXCEPT)
+--
+-- Simple UNION constructs
+SELECT 1 AS two UNION SELECT 2 ORDER BY 1;
+ two 
+-----
+   1
+   2
+(2 rows)
+
+SELECT 1 AS one UNION SELECT 1 ORDER BY 1;
+ one 
+-----
+   1
+(1 row)
+
+SELECT 1 AS two UNION ALL SELECT 2;
+ two 
+-----
+   1
+   2
+(2 rows)
+
+SELECT 1 AS two UNION ALL SELECT 1;
+ two 
+-----
+   1
+   1
+(2 rows)
+
+SELECT 1 AS three UNION SELECT 2 UNION SELECT 3 ORDER BY 1;
+ three 
+-------
+     1
+     2
+     3
+(3 rows)
+
+SELECT 1 AS two UNION SELECT 2 UNION SELECT 2 ORDER BY 1;
+ two 
+-----
+   1
+   2
+(2 rows)
+
+SELECT 1 AS three UNION SELECT 2 UNION ALL SELECT 2 ORDER BY 1;
+ three 
+-------
+     1
+     2
+     2
+(3 rows)
+
+SELECT 1.1 AS two UNION SELECT 2.2 ORDER BY 1;
+ two 
+-----
+ 1.1
+ 2.2
+(2 rows)
+
+-- Mixed types
+SELECT 1.1 AS two UNION SELECT 2 ORDER BY 1;
+ two 
+-----
+ 1.1
+   2
+(2 rows)
+
+SELECT 1 AS two UNION SELECT 2.2 ORDER BY 1;
+ two 
+-----
+   1
+ 2.2
+(2 rows)
+
+SELECT 1 AS one UNION SELECT 1.0::float8 ORDER BY 1;
+ one 
+-----
+   1
+(1 row)
+
+SELECT 1.1 AS two UNION ALL SELECT 2 ORDER BY 1;
+ two 
+-----
+ 1.1
+   2
+(2 rows)
+
+SELECT 1.0::float8 AS two UNION ALL SELECT 1 ORDER BY 1;
+ two 
+-----
+   1
+   1
+(2 rows)
+
+SELECT 1.1 AS three UNION SELECT 2 UNION SELECT 3 ORDER BY 1;
+ three 
+-------
+   1.1
+     2
+     3
+(3 rows)
+
+SELECT 1.1::float8 AS two UNION SELECT 2 UNION SELECT 2.0::float8 ORDER BY 1;
+ two 
+-----
+ 1.1
+   2
+(2 rows)
+
+SELECT 1.1 AS three UNION SELECT 2 UNION ALL SELECT 2 ORDER BY 1;
+ three 
+-------
+   1.1
+     2
+     2
+(3 rows)
+
+SELECT 1.1 AS two UNION (SELECT 2 UNION ALL SELECT 2) ORDER BY 1;
+ two 
+-----
+ 1.1
+   2
+(2 rows)
+
+--
+-- Try testing from tables...
+--
+SELECT f1 AS five FROM FLOAT8_TBL
+UNION
+SELECT f1 FROM FLOAT8_TBL
+ORDER BY 1;
+         five          
+-----------------------
+ -1.2345678901234e+200
+               -1004.3
+                -34.84
+ -1.2345678901234e-200
+                     0
+(5 rows)
+
+SELECT f1 AS ten FROM FLOAT8_TBL
+UNION ALL
+SELECT f1 FROM FLOAT8_TBL;
+          ten          
+-----------------------
+                     0
+                -34.84
+               -1004.3
+ -1.2345678901234e+200
+ -1.2345678901234e-200
+                     0
+                -34.84
+               -1004.3
+ -1.2345678901234e+200
+ -1.2345678901234e-200
+(10 rows)
+
+SELECT f1 AS nine FROM FLOAT8_TBL
+UNION
+SELECT f1 FROM INT4_TBL
+ORDER BY 1;
+         nine          
+-----------------------
+ -1.2345678901234e+200
+           -2147483647
+               -123456
+               -1004.3
+                -34.84
+ -1.2345678901234e-200
+                     0
+                123456
+            2147483647
+(9 rows)
+
+SELECT f1 AS ten FROM FLOAT8_TBL
+UNION ALL
+SELECT f1 FROM INT4_TBL;
+          ten          
+-----------------------
+                     0
+                -34.84
+               -1004.3
+ -1.2345678901234e+200
+ -1.2345678901234e-200
+                     0
+                123456
+               -123456
+            2147483647
+           -2147483647
+(10 rows)
+
+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;
+         five          
+-----------------------
+               -1004.3
+                -34.84
+ -1.2345678901234e-200
+                     0
+                123456
+(5 rows)
+
+SELECT CAST(f1 AS char(4)) AS three FROM VARCHAR_TBL
+UNION
+SELECT f1 FROM CHAR_TBL
+ORDER BY 1;
+ three 
+-------
+ a   
+ ab  
+ abcd
+(3 rows)
+
+SELECT f1 AS three FROM VARCHAR_TBL
+UNION
+SELECT CAST(f1 AS varchar) FROM CHAR_TBL
+ORDER BY 1;
+ three 
+-------
+ a
+ ab
+ abcd
+(3 rows)
+
+SELECT f1 AS eight FROM VARCHAR_TBL
+UNION ALL
+SELECT f1 FROM CHAR_TBL;
+ eight 
+-------
+ a
+ ab
+ abcd
+ abcd
+ a
+ ab
+ abcd
+ abcd
+(8 rows)
+
+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;
+       five        
+-------------------
+ a
+ ab
+ abcd
+ doh!
+ hi de ho neighbor
+(5 rows)
+
+--
+-- INTERSECT and EXCEPT
+--
+SELECT q2 FROM int8_tbl INTERSECT SELECT q1 FROM int8_tbl ORDER BY 1;
+        q2        
+------------------
+              123
+ 4567890123456789
+(2 rows)
+
+SELECT q2 FROM int8_tbl INTERSECT ALL SELECT q1 FROM int8_tbl ORDER BY 1;
+        q2        
+------------------
+              123
+ 4567890123456789
+ 4567890123456789
+(3 rows)
+
+SELECT q2 FROM int8_tbl EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1;
+        q2         
+-------------------
+ -4567890123456789
+               456
+(2 rows)
+
+SELECT q2 FROM int8_tbl EXCEPT ALL SELECT q1 FROM int8_tbl ORDER BY 1;
+        q2         
+-------------------
+ -4567890123456789
+               456
+(2 rows)
+
+SELECT q2 FROM int8_tbl EXCEPT ALL SELECT DISTINCT q1 FROM int8_tbl ORDER BY 1;
+        q2         
+-------------------
+ -4567890123456789
+               456
+  4567890123456789
+(3 rows)
+
+SELECT q1 FROM int8_tbl EXCEPT SELECT q2 FROM int8_tbl ORDER BY 1;
+ q1 
+----
+(0 rows)
+
+SELECT q1 FROM int8_tbl EXCEPT ALL SELECT q2 FROM int8_tbl ORDER BY 1;
+        q1        
+------------------
+              123
+ 4567890123456789
+(2 rows)
+
+SELECT q1 FROM int8_tbl EXCEPT ALL SELECT DISTINCT q2 FROM int8_tbl ORDER BY 1;
+        q1        
+------------------
+              123
+ 4567890123456789
+ 4567890123456789
+(3 rows)
+
+SELECT q1 FROM int8_tbl EXCEPT ALL SELECT q1 FROM int8_tbl FOR NO KEY UPDATE;
+ERROR:  FOR NO KEY UPDATE is not allowed with UNION/INTERSECT/EXCEPT
+-- nested cases
+(SELECT 1,2,3 UNION SELECT 4,5,6) INTERSECT SELECT 4,5,6;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+        4 |        5 |        6
+(1 row)
+
+(SELECT 1,2,3 UNION SELECT 4,5,6 ORDER BY 1,2) INTERSECT SELECT 4,5,6;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+        4 |        5 |        6
+(1 row)
+
+(SELECT 1,2,3 UNION SELECT 4,5,6) EXCEPT SELECT 4,5,6;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+        1 |        2 |        3
+(1 row)
+
+(SELECT 1,2,3 UNION SELECT 4,5,6 ORDER BY 1,2) EXCEPT SELECT 4,5,6;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+        1 |        2 |        3
+(1 row)
+
+-- exercise both hashed and sorted implementations of INTERSECT/EXCEPT
+set enable_hashagg to on;
+explain (costs off)
+select count(*) from
+  ( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
+                                     QUERY PLAN                                     
+------------------------------------------------------------------------------------
+ Aggregate
+   ->  Subquery Scan on ss
+         ->  HashSetOp Intersect
+               ->  Append
+                     ->  Subquery Scan on "*SELECT* 2"
+                           ->  Seq Scan on tenk1
+                     ->  Subquery Scan on "*SELECT* 1"
+                           ->  Index Only Scan using tenk1_unique1 on tenk1 tenk1_1
+(8 rows)
+
+select count(*) from
+  ( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
+ count 
+-------
+  5000
+(1 row)
+
+explain (costs off)
+select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
+                               QUERY PLAN                               
+------------------------------------------------------------------------
+ HashSetOp Except
+   ->  Append
+         ->  Subquery Scan on "*SELECT* 1"
+               ->  Index Only Scan using tenk1_unique1 on tenk1
+         ->  Subquery Scan on "*SELECT* 2"
+               ->  Index Only Scan using tenk1_unique2 on tenk1 tenk1_1
+                     Filter: (unique2 <> 10)
+(7 rows)
+
+select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
+ unique1 
+---------
+      10
+(1 row)
+
+set enable_hashagg to off;
+explain (costs off)
+select count(*) from
+  ( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
+                                        QUERY PLAN                                        
+------------------------------------------------------------------------------------------
+ Aggregate
+   ->  Subquery Scan on ss
+         ->  SetOp Intersect
+               ->  Sort
+                     Sort Key: "*SELECT* 2".fivethous
+                     ->  Append
+                           ->  Subquery Scan on "*SELECT* 2"
+                                 ->  Seq Scan on tenk1
+                           ->  Subquery Scan on "*SELECT* 1"
+                                 ->  Index Only Scan using tenk1_unique1 on tenk1 tenk1_1
+(10 rows)
+
+select count(*) from
+  ( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
+ count 
+-------
+  5000
+(1 row)
+
+explain (costs off)
+select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
+                                  QUERY PLAN                                  
+------------------------------------------------------------------------------
+ SetOp Except
+   ->  Sort
+         Sort Key: "*SELECT* 1".unique1
+         ->  Append
+               ->  Subquery Scan on "*SELECT* 1"
+                     ->  Index Only Scan using tenk1_unique1 on tenk1
+               ->  Subquery Scan on "*SELECT* 2"
+                     ->  Index Only Scan using tenk1_unique2 on tenk1 tenk1_1
+                           Filter: (unique2 <> 10)
+(9 rows)
+
+select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
+ unique1 
+---------
+      10
+(1 row)
+
+reset enable_hashagg;
+--
+-- Mixed types
+--
+SELECT f1 FROM float8_tbl INTERSECT SELECT f1 FROM int4_tbl ORDER BY 1;
+ f1 
+----
+  0
+(1 row)
+
+SELECT f1 FROM float8_tbl EXCEPT SELECT f1 FROM int4_tbl ORDER BY 1;
+          f1           
+-----------------------
+ -1.2345678901234e+200
+               -1004.3
+                -34.84
+ -1.2345678901234e-200
+(4 rows)
+
+--
+-- 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;
+        q1         
+-------------------
+ -4567890123456789
+               123
+               123
+               456
+  4567890123456789
+  4567890123456789
+  4567890123456789
+(7 rows)
+
+SELECT q1 FROM int8_tbl INTERSECT (((SELECT q2 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl))) ORDER BY 1;
+        q1        
+------------------
+              123
+ 4567890123456789
+(2 rows)
+
+(((SELECT q1 FROM int8_tbl INTERSECT SELECT q2 FROM int8_tbl ORDER BY 1))) UNION ALL SELECT q2 FROM int8_tbl;
+        q1         
+-------------------
+               123
+  4567890123456789
+               456
+  4567890123456789
+               123
+  4567890123456789
+ -4567890123456789
+(7 rows)
+
+SELECT q1 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1;
+        q1         
+-------------------
+ -4567890123456789
+               456
+(2 rows)
+
+SELECT q1 FROM int8_tbl UNION ALL (((SELECT q2 FROM int8_tbl EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1)));
+        q1         
+-------------------
+               123
+               123
+  4567890123456789
+  4567890123456789
+  4567890123456789
+ -4567890123456789
+               456
+(7 rows)
+
+(((SELECT q1 FROM int8_tbl UNION ALL SELECT q2 FROM int8_tbl))) EXCEPT SELECT q1 FROM int8_tbl ORDER BY 1;
+        q1         
+-------------------
+ -4567890123456789
+               456
+(2 rows)
+
+--
+-- 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;
+        q1        |        q2         
+------------------+-------------------
+ 4567890123456789 | -4567890123456789
+              123 |               456
+(2 rows)
+
+-- 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;
+ERROR:  column "q2" does not exist
+LINE 1: ... int8_tbl EXCEPT SELECT q2 FROM int8_tbl ORDER BY q2 LIMIT 1...
+                                                             ^
+HINT:  There is a column named "q2" in table "*SELECT* 2", but it cannot be referenced from this part of the query.
+-- But this should work:
+SELECT q1 FROM int8_tbl EXCEPT (((SELECT q2 FROM int8_tbl ORDER BY q2 LIMIT 1))) ORDER BY 1;
+        q1        
+------------------
+              123
+ 4567890123456789
+(2 rows)
+
+--
+-- New syntaxes (7.1) permit new tests
+--
+(((((select * from int8_tbl)))));
+        q1        |        q2         
+------------------+-------------------
+              123 |               456
+              123 |  4567890123456789
+ 4567890123456789 |               123
+ 4567890123456789 |  4567890123456789
+ 4567890123456789 | -4567890123456789
+(5 rows)
+
+--
+-- Check behavior with empty select list (allowed since 9.4)
+--
+select union select;
+--
+(1 row)
+
+select intersect select;
+--
+(1 row)
+
+select except select;
+--
+(0 rows)
+
+-- 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);
+                           QUERY PLAN                           
+----------------------------------------------------------------
+ HashAggregate
+   ->  Append
+         ->  Function Scan on generate_series
+         ->  Function Scan on generate_series generate_series_1
+(4 rows)
+
+explain (costs off)
+select from generate_series(1,5) intersect select from generate_series(1,3);
+                              QUERY PLAN                              
+----------------------------------------------------------------------
+ HashSetOp Intersect
+   ->  Append
+         ->  Subquery Scan on "*SELECT* 1"
+               ->  Function Scan on generate_series
+         ->  Subquery Scan on "*SELECT* 2"
+               ->  Function Scan on generate_series generate_series_1
+(6 rows)
+
+select from generate_series(1,5) union select from generate_series(1,3);
+--
+(1 row)
+
+select from generate_series(1,5) union all select from generate_series(1,3);
+--
+(8 rows)
+
+select from generate_series(1,5) intersect select from generate_series(1,3);
+--
+(1 row)
+
+select from generate_series(1,5) intersect all select from generate_series(1,3);
+--
+(3 rows)
+
+select from generate_series(1,5) except select from generate_series(1,3);
+--
+(0 rows)
+
+select from generate_series(1,5) except all select from generate_series(1,3);
+--
+(2 rows)
+
+-- 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);
+                           QUERY PLAN                           
+----------------------------------------------------------------
+ Unique
+   ->  Append
+         ->  Function Scan on generate_series
+         ->  Function Scan on generate_series generate_series_1
+(4 rows)
+
+explain (costs off)
+select from generate_series(1,5) intersect select from generate_series(1,3);
+                              QUERY PLAN                              
+----------------------------------------------------------------------
+ SetOp Intersect
+   ->  Append
+         ->  Subquery Scan on "*SELECT* 1"
+               ->  Function Scan on generate_series
+         ->  Subquery Scan on "*SELECT* 2"
+               ->  Function Scan on generate_series generate_series_1
+(6 rows)
+
+select from generate_series(1,5) union select from generate_series(1,3);
+--
+(1 row)
+
+select from generate_series(1,5) union all select from generate_series(1,3);
+--
+(8 rows)
+
+select from generate_series(1,5) intersect select from generate_series(1,3);
+--
+(1 row)
+
+select from generate_series(1,5) intersect all select from generate_series(1,3);
+--
+(3 rows)
+
+select from generate_series(1,5) except select from generate_series(1,3);
+--
+(0 rows)
+
+select from generate_series(1,5) except all select from generate_series(1,3);
+--
+(2 rows)
+
+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;
+  f1  
+------
+ a
+ ab
+ abcd
+ test
+(4 rows)
+
+-- This should fail, but it should produce an error cursor
+SELECT '3.4'::numeric UNION SELECT 'foo';
+ERROR:  invalid input syntax for type numeric: "foo"
+LINE 1: 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';
+                 QUERY PLAN                  
+---------------------------------------------
+ Append
+   ->  Index Scan using t1_ab_idx on t1
+         Index Cond: ((a || b) = 'ab'::text)
+   ->  Index Only Scan using t2_pkey on t2
+         Index Cond: (ab = 'ab'::text)
+(5 rows)
+
+explain (costs off)
+ SELECT * FROM
+ (SELECT a || b AS ab FROM t1
+  UNION
+  SELECT * FROM t2) t
+ WHERE ab = 'ab';
+                    QUERY PLAN                     
+---------------------------------------------------
+ HashAggregate
+   Group Key: ((t1.a || t1.b))
+   ->  Append
+         ->  Index Scan using t1_ab_idx on t1
+               Index Cond: ((a || b) = 'ab'::text)
+         ->  Index Only Scan using t2_pkey on t2
+               Index Cond: (ab = 'ab'::text)
+(7 rows)
+
+--
+-- 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;
+                     QUERY PLAN                      
+-----------------------------------------------------
+ Limit
+   ->  Merge Append
+         Sort Key: ((t1.a || t1.b))
+         ->  Index Scan using t1_ab_idx on t1
+         ->  Index Scan using t1c_ab_idx on t1c t1_1
+         ->  Index Scan using t2_pkey on t2
+         ->  Index Scan using t2c_pkey on t2c t2_1
+(7 rows)
+
+  SELECT * FROM
+  (SELECT a || b AS ab FROM t1
+   UNION ALL
+   SELECT ab FROM t2) t
+  ORDER BY 1 LIMIT 8;
+ ab 
+----
+ ab
+ ab
+ cd
+ dc
+ ef
+ fe
+ mn
+ nm
+(8 rows)
+
+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;
+                        QUERY PLAN                        
+----------------------------------------------------------
+ Merge Append
+   Sort Key: events.event_id
+   ->  Index Scan using events_pkey on events
+   ->  Sort
+         Sort Key: events_1.event_id
+         ->  Seq Scan on events_child events_1
+   ->  Index Scan using other_events_pkey on other_events
+(7 rows)
+
+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;
+     QUERY PLAN      
+---------------------
+ Seq Scan on tenk1 b
+(1 row)
+
+-- 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;
+                    QUERY PLAN                    
+--------------------------------------------------
+ Sort
+   Sort Key: (2)
+   ->  Unique
+         ->  Sort
+               Sort Key: (1), (2)
+               ->  Append
+                     ->  Result
+                     ->  Result
+                           One-Time Filter: false
+(9 rows)
+
+SELECT * FROM
+  (SELECT 1 AS t, 2 AS x
+   UNION
+   SELECT 2 AS t, 4 AS x) ss
+WHERE x < 4
+ORDER BY x;
+ t | x 
+---+---
+ 1 | 2
+(1 row)
+
+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;
+                       QUERY PLAN                       
+--------------------------------------------------------
+ Sort
+   Sort Key: ss.x
+   ->  Subquery Scan on ss
+         Filter: (ss.x < 4)
+         ->  HashAggregate
+               Group Key: (1), (generate_series(1, 10))
+               ->  Append
+                     ->  ProjectSet
+                           ->  Result
+                     ->  Result
+(10 rows)
+
+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;
+ t | x 
+---+---
+ 1 | 1
+ 1 | 2
+ 1 | 3
+(3 rows)
+
+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;
+                                     QUERY PLAN                                     
+------------------------------------------------------------------------------------
+ Sort
+   Sort Key: ss.x
+   ->  Subquery Scan on ss
+         Filter: (ss.x > 3)
+         ->  Unique
+               ->  Sort
+                     Sort Key: (1), (((random() * '3'::double precision))::integer)
+                     ->  Append
+                           ->  Result
+                           ->  Result
+(10 rows)
+
+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;
+ t | x 
+---+---
+ 2 | 4
+(1 row)
+
+-- 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;
+                        QUERY PLAN                        
+----------------------------------------------------------
+ Unique
+   ->  Merge Append
+         Sort Key: "*SELECT* 1".q1
+         ->  Subquery Scan on "*SELECT* 1"
+               ->  Unique
+                     ->  Sort
+                           Sort Key: i81.q1, i81.q2
+                           ->  Seq Scan on int8_tbl i81
+                                 Filter: (q2 IS NOT NULL)
+         ->  Subquery Scan on "*SELECT* 2"
+               ->  Unique
+                     ->  Sort
+                           Sort Key: i82.q1, i82.q2
+                           ->  Seq Scan on int8_tbl i82
+                                 Filter: (q2 IS NOT NULL)
+(15 rows)
+
+select distinct q1 from
+  (select distinct * from int8_tbl i81
+   union all
+   select distinct * from int8_tbl i82) ss
+where q2 = q2;
+        q1        
+------------------
+              123
+ 4567890123456789
+(2 rows)
+
+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;
+                       QUERY PLAN                       
+--------------------------------------------------------
+ Unique
+   ->  Merge Append
+         Sort Key: "*SELECT* 1".q1
+         ->  Subquery Scan on "*SELECT* 1"
+               ->  Unique
+                     ->  Sort
+                           Sort Key: i81.q1, i81.q2
+                           ->  Seq Scan on int8_tbl i81
+                                 Filter: ((- q1) = q2)
+         ->  Subquery Scan on "*SELECT* 2"
+               ->  Unique
+                     ->  Sort
+                           Sort Key: i82.q1, i82.q2
+                           ->  Seq Scan on int8_tbl i82
+                                 Filter: ((- q1) = q2)
+(15 rows)
+
+select distinct q1 from
+  (select distinct * from int8_tbl i81
+   union all
+   select distinct * from int8_tbl i82) ss
+where -q1 = q2;
+        q1        
+------------------
+ 4567890123456789
+(1 row)
+
+-- 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);
+                         QUERY PLAN                         
+------------------------------------------------------------
+ Nested Loop
+   ->  Seq Scan on int4_tbl
+   ->  Append
+         ->  Index Scan using t3i on t3 a
+               Index Cond: (expensivefunc(x) = int4_tbl.f1)
+         ->  Index Scan using t3i on t3 b
+               Index Cond: (expensivefunc(x) = int4_tbl.f1)
+(7 rows)
+
+select * from
+  (select * from t3 a union all select * from t3 b) ss
+  join int4_tbl on f1 = expensivefunc(x);
+ x | f1 
+---+----
+ 0 |  0
+ 0 |  0
+(2 rows)
+
+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);
+                 QUERY PLAN                  
+---------------------------------------------
+ Append
+   ->  Seq Scan on int8_tbl a
+   ->  Seq Scan on int8_tbl b
+         Filter: ((q1 >= q2) AND (q1 <= q2))
+(4 rows)
+
+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);
+        q1        |        q2         | x 
+------------------+-------------------+---
+              123 |               456 | 0
+              123 |  4567890123456789 | 0
+ 4567890123456789 |               123 | 0
+ 4567890123456789 |  4567890123456789 | 0
+ 4567890123456789 | -4567890123456789 | 0
+ 4567890123456789 |  4567890123456789 | 1
+(6 rows)
+