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+--
+-- tsrf - targetlist set returning function tests
+--
+-- simple srf
+SELECT generate_series(1, 3);
+ generate_series
+-----------------
+ 1
+ 2
+ 3
+(3 rows)
+
+-- parallel iteration
+SELECT generate_series(1, 3), generate_series(3,5);
+ generate_series | generate_series
+-----------------+-----------------
+ 1 | 3
+ 2 | 4
+ 3 | 5
+(3 rows)
+
+-- parallel iteration, different number of rows
+SELECT generate_series(1, 2), generate_series(1,4);
+ generate_series | generate_series
+-----------------+-----------------
+ 1 | 1
+ 2 | 2
+ | 3
+ | 4
+(4 rows)
+
+-- srf, with SRF argument
+SELECT generate_series(1, generate_series(1, 3));
+ generate_series
+-----------------
+ 1
+ 1
+ 2
+ 1
+ 2
+ 3
+(6 rows)
+
+-- but we've traditionally rejected the same in FROM
+SELECT * FROM generate_series(1, generate_series(1, 3));
+ERROR: set-returning functions must appear at top level of FROM
+LINE 1: SELECT * FROM generate_series(1, generate_series(1, 3));
+ ^
+-- srf, with two SRF arguments
+SELECT generate_series(generate_series(1,3), generate_series(2, 4));
+ generate_series
+-----------------
+ 1
+ 2
+ 2
+ 3
+ 3
+ 4
+(6 rows)
+
+-- check proper nesting of SRFs in different expressions
+explain (verbose, costs off)
+SELECT generate_series(1, generate_series(1, 3)), generate_series(2, 4);
+ QUERY PLAN
+--------------------------------------------------------------------------------
+ ProjectSet
+ Output: generate_series(1, (generate_series(1, 3))), (generate_series(2, 4))
+ -> ProjectSet
+ Output: generate_series(1, 3), generate_series(2, 4)
+ -> Result
+(5 rows)
+
+SELECT generate_series(1, generate_series(1, 3)), generate_series(2, 4);
+ generate_series | generate_series
+-----------------+-----------------
+ 1 | 2
+ 1 | 3
+ 2 | 3
+ 1 | 4
+ 2 | 4
+ 3 | 4
+(6 rows)
+
+CREATE TABLE few(id int, dataa text, datab text);
+INSERT INTO few VALUES(1, 'a', 'foo'),(2, 'a', 'bar'),(3, 'b', 'bar');
+-- SRF with a provably-dummy relation
+explain (verbose, costs off)
+SELECT unnest(ARRAY[1, 2]) FROM few WHERE false;
+ QUERY PLAN
+--------------------------------------
+ ProjectSet
+ Output: unnest('{1,2}'::integer[])
+ -> Result
+ One-Time Filter: false
+(4 rows)
+
+SELECT unnest(ARRAY[1, 2]) FROM few WHERE false;
+ unnest
+--------
+(0 rows)
+
+-- SRF shouldn't prevent upper query from recognizing lower as dummy
+explain (verbose, costs off)
+SELECT * FROM few f1,
+ (SELECT unnest(ARRAY[1,2]) FROM few f2 WHERE false OFFSET 0) ss;
+ QUERY PLAN
+------------------------------------------------
+ Result
+ Output: f1.id, f1.dataa, f1.datab, ss.unnest
+ One-Time Filter: false
+(3 rows)
+
+SELECT * FROM few f1,
+ (SELECT unnest(ARRAY[1,2]) FROM few f2 WHERE false OFFSET 0) ss;
+ id | dataa | datab | unnest
+----+-------+-------+--------
+(0 rows)
+
+-- SRF output order of sorting is maintained, if SRF is not referenced
+SELECT few.id, generate_series(1,3) g FROM few ORDER BY id DESC;
+ id | g
+----+---
+ 3 | 1
+ 3 | 2
+ 3 | 3
+ 2 | 1
+ 2 | 2
+ 2 | 3
+ 1 | 1
+ 1 | 2
+ 1 | 3
+(9 rows)
+
+-- but SRFs can be referenced in sort
+SELECT few.id, generate_series(1,3) g FROM few ORDER BY id, g DESC;
+ id | g
+----+---
+ 1 | 3
+ 1 | 2
+ 1 | 1
+ 2 | 3
+ 2 | 2
+ 2 | 1
+ 3 | 3
+ 3 | 2
+ 3 | 1
+(9 rows)
+
+SELECT few.id, generate_series(1,3) g FROM few ORDER BY id, generate_series(1,3) DESC;
+ id | g
+----+---
+ 1 | 3
+ 1 | 2
+ 1 | 1
+ 2 | 3
+ 2 | 2
+ 2 | 1
+ 3 | 3
+ 3 | 2
+ 3 | 1
+(9 rows)
+
+-- it's weird to have ORDER BYs that increase the number of results
+SELECT few.id FROM few ORDER BY id, generate_series(1,3) DESC;
+ id
+----
+ 1
+ 1
+ 1
+ 2
+ 2
+ 2
+ 3
+ 3
+ 3
+(9 rows)
+
+-- SRFs are computed after aggregation
+SET enable_hashagg TO 0; -- stable output order
+SELECT few.dataa, count(*), min(id), max(id), unnest('{1,1,3}'::int[]) FROM few WHERE few.id = 1 GROUP BY few.dataa;
+ dataa | count | min | max | unnest
+-------+-------+-----+-----+--------
+ a | 1 | 1 | 1 | 1
+ a | 1 | 1 | 1 | 1
+ a | 1 | 1 | 1 | 3
+(3 rows)
+
+-- unless referenced in GROUP BY clause
+SELECT few.dataa, count(*), min(id), max(id), unnest('{1,1,3}'::int[]) FROM few WHERE few.id = 1 GROUP BY few.dataa, unnest('{1,1,3}'::int[]);
+ dataa | count | min | max | unnest
+-------+-------+-----+-----+--------
+ a | 2 | 1 | 1 | 1
+ a | 1 | 1 | 1 | 3
+(2 rows)
+
+SELECT few.dataa, count(*), min(id), max(id), unnest('{1,1,3}'::int[]) FROM few WHERE few.id = 1 GROUP BY few.dataa, 5;
+ dataa | count | min | max | unnest
+-------+-------+-----+-----+--------
+ a | 2 | 1 | 1 | 1
+ a | 1 | 1 | 1 | 3
+(2 rows)
+
+RESET enable_hashagg;
+-- check HAVING works when GROUP BY does [not] reference SRF output
+SELECT dataa, generate_series(1,1), count(*) FROM few GROUP BY 1 HAVING count(*) > 1;
+ dataa | generate_series | count
+-------+-----------------+-------
+ a | 1 | 2
+(1 row)
+
+SELECT dataa, generate_series(1,1), count(*) FROM few GROUP BY 1, 2 HAVING count(*) > 1;
+ dataa | generate_series | count
+-------+-----------------+-------
+ a | 1 | 2
+(1 row)
+
+-- it's weird to have GROUP BYs that increase the number of results
+SELECT few.dataa, count(*) FROM few WHERE dataa = 'a' GROUP BY few.dataa ORDER BY 2;
+ dataa | count
+-------+-------
+ a | 2
+(1 row)
+
+SELECT few.dataa, count(*) FROM few WHERE dataa = 'a' GROUP BY few.dataa, unnest('{1,1,3}'::int[]) ORDER BY 2;
+ dataa | count
+-------+-------
+ a | 2
+ a | 4
+(2 rows)
+
+-- SRFs are not allowed if they'd need to be conditionally executed
+SELECT q1, case when q1 > 0 then generate_series(1,3) else 0 end FROM int8_tbl;
+ERROR: set-returning functions are not allowed in CASE
+LINE 1: SELECT q1, case when q1 > 0 then generate_series(1,3) else 0...
+ ^
+HINT: You might be able to move the set-returning function into a LATERAL FROM item.
+SELECT q1, coalesce(generate_series(1,3), 0) FROM int8_tbl;
+ERROR: set-returning functions are not allowed in COALESCE
+LINE 1: SELECT q1, coalesce(generate_series(1,3), 0) FROM int8_tbl;
+ ^
+HINT: You might be able to move the set-returning function into a LATERAL FROM item.
+-- SRFs are not allowed in aggregate arguments
+SELECT min(generate_series(1, 3)) FROM few;
+ERROR: aggregate function calls cannot contain set-returning function calls
+LINE 1: SELECT min(generate_series(1, 3)) FROM few;
+ ^
+HINT: You might be able to move the set-returning function into a LATERAL FROM item.
+-- ... unless they're within a sub-select
+SELECT sum((3 = ANY(SELECT generate_series(1,4)))::int);
+ sum
+-----
+ 1
+(1 row)
+
+SELECT sum((3 = ANY(SELECT lag(x) over(order by x)
+ FROM generate_series(1,4) x))::int);
+ sum
+-----
+ 1
+(1 row)
+
+-- SRFs are not allowed in window function arguments, either
+SELECT min(generate_series(1, 3)) OVER() FROM few;
+ERROR: window function calls cannot contain set-returning function calls
+LINE 1: SELECT min(generate_series(1, 3)) OVER() FROM few;
+ ^
+HINT: You might be able to move the set-returning function into a LATERAL FROM item.
+-- SRFs are normally computed after window functions
+SELECT id,lag(id) OVER(), count(*) OVER(), generate_series(1,3) FROM few;
+ id | lag | count | generate_series
+----+-----+-------+-----------------
+ 1 | | 3 | 1
+ 1 | | 3 | 2
+ 1 | | 3 | 3
+ 2 | 1 | 3 | 1
+ 2 | 1 | 3 | 2
+ 2 | 1 | 3 | 3
+ 3 | 2 | 3 | 1
+ 3 | 2 | 3 | 2
+ 3 | 2 | 3 | 3
+(9 rows)
+
+-- unless referencing SRFs
+SELECT SUM(count(*)) OVER(PARTITION BY generate_series(1,3) ORDER BY generate_series(1,3)), generate_series(1,3) g FROM few GROUP BY g;
+ sum | g
+-----+---
+ 3 | 1
+ 3 | 2
+ 3 | 3
+(3 rows)
+
+-- sorting + grouping
+SELECT few.dataa, count(*), min(id), max(id), generate_series(1,3) FROM few GROUP BY few.dataa ORDER BY 5, 1;
+ dataa | count | min | max | generate_series
+-------+-------+-----+-----+-----------------
+ a | 2 | 1 | 2 | 1
+ b | 1 | 3 | 3 | 1
+ a | 2 | 1 | 2 | 2
+ b | 1 | 3 | 3 | 2
+ a | 2 | 1 | 2 | 3
+ b | 1 | 3 | 3 | 3
+(6 rows)
+
+-- grouping sets are a bit special, they produce NULLs in columns not actually NULL
+set enable_hashagg = false;
+SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab);
+ dataa | b | g | count
+-------+-----+---+-------
+ a | bar | 1 | 1
+ a | bar | 2 | 1
+ a | foo | 1 | 1
+ a | foo | 2 | 1
+ a | | 1 | 2
+ a | | 2 | 2
+ b | bar | 1 | 1
+ b | bar | 2 | 1
+ b | | 1 | 1
+ b | | 2 | 1
+ | | 1 | 3
+ | | 2 | 3
+ | bar | 1 | 2
+ | bar | 2 | 2
+ | foo | 1 | 1
+ | foo | 2 | 1
+(16 rows)
+
+SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab) ORDER BY dataa;
+ dataa | b | g | count
+-------+-----+---+-------
+ a | bar | 1 | 1
+ a | bar | 2 | 1
+ a | foo | 1 | 1
+ a | foo | 2 | 1
+ a | | 1 | 2
+ a | | 2 | 2
+ b | bar | 1 | 1
+ b | bar | 2 | 1
+ b | | 1 | 1
+ b | | 2 | 1
+ | | 1 | 3
+ | | 2 | 3
+ | bar | 1 | 2
+ | bar | 2 | 2
+ | foo | 1 | 1
+ | foo | 2 | 1
+(16 rows)
+
+SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab) ORDER BY g;
+ dataa | b | g | count
+-------+-----+---+-------
+ a | bar | 1 | 1
+ a | foo | 1 | 1
+ a | | 1 | 2
+ b | bar | 1 | 1
+ b | | 1 | 1
+ | | 1 | 3
+ | bar | 1 | 2
+ | foo | 1 | 1
+ | foo | 2 | 1
+ a | bar | 2 | 1
+ b | | 2 | 1
+ a | foo | 2 | 1
+ | bar | 2 | 2
+ a | | 2 | 2
+ | | 2 | 3
+ b | bar | 2 | 1
+(16 rows)
+
+SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab, g);
+ dataa | b | g | count
+-------+-----+---+-------
+ a | bar | 1 | 1
+ a | bar | 2 | 1
+ a | bar | | 2
+ a | foo | 1 | 1
+ a | foo | 2 | 1
+ a | foo | | 2
+ a | | | 4
+ b | bar | 1 | 1
+ b | bar | 2 | 1
+ b | bar | | 2
+ b | | | 2
+ | | | 6
+ | bar | 1 | 2
+ | bar | 2 | 2
+ | bar | | 4
+ | foo | 1 | 1
+ | foo | 2 | 1
+ | foo | | 2
+ a | | 1 | 2
+ b | | 1 | 1
+ | | 1 | 3
+ a | | 2 | 2
+ b | | 2 | 1
+ | | 2 | 3
+(24 rows)
+
+SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab, g) ORDER BY dataa;
+ dataa | b | g | count
+-------+-----+---+-------
+ a | foo | | 2
+ a | | | 4
+ a | | 2 | 2
+ a | bar | 1 | 1
+ a | bar | 2 | 1
+ a | bar | | 2
+ a | foo | 1 | 1
+ a | foo | 2 | 1
+ a | | 1 | 2
+ b | bar | 1 | 1
+ b | | | 2
+ b | | 1 | 1
+ b | bar | 2 | 1
+ b | bar | | 2
+ b | | 2 | 1
+ | | 2 | 3
+ | | | 6
+ | bar | 1 | 2
+ | bar | 2 | 2
+ | bar | | 4
+ | foo | 1 | 1
+ | foo | 2 | 1
+ | foo | | 2
+ | | 1 | 3
+(24 rows)
+
+SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab, g) ORDER BY g;
+ dataa | b | g | count
+-------+-----+---+-------
+ a | bar | 1 | 1
+ a | foo | 1 | 1
+ b | bar | 1 | 1
+ | bar | 1 | 2
+ | foo | 1 | 1
+ a | | 1 | 2
+ b | | 1 | 1
+ | | 1 | 3
+ a | | 2 | 2
+ b | | 2 | 1
+ | bar | 2 | 2
+ | | 2 | 3
+ | foo | 2 | 1
+ a | bar | 2 | 1
+ a | foo | 2 | 1
+ b | bar | 2 | 1
+ a | | | 4
+ b | bar | | 2
+ b | | | 2
+ | | | 6
+ a | foo | | 2
+ a | bar | | 2
+ | bar | | 4
+ | foo | | 2
+(24 rows)
+
+reset enable_hashagg;
+-- case with degenerate ORDER BY
+explain (verbose, costs off)
+select 'foo' as f, generate_series(1,2) as g from few order by 1;
+ QUERY PLAN
+----------------------------------------------
+ ProjectSet
+ Output: 'foo'::text, generate_series(1, 2)
+ -> Seq Scan on public.few
+ Output: id, dataa, datab
+(4 rows)
+
+select 'foo' as f, generate_series(1,2) as g from few order by 1;
+ f | g
+-----+---
+ foo | 1
+ foo | 2
+ foo | 1
+ foo | 2
+ foo | 1
+ foo | 2
+(6 rows)
+
+-- data modification
+CREATE TABLE fewmore AS SELECT generate_series(1,3) AS data;
+INSERT INTO fewmore VALUES(generate_series(4,5));
+SELECT * FROM fewmore;
+ data
+------
+ 1
+ 2
+ 3
+ 4
+ 5
+(5 rows)
+
+-- SRFs are not allowed in UPDATE (they once were, but it was nonsense)
+UPDATE fewmore SET data = generate_series(4,9);
+ERROR: set-returning functions are not allowed in UPDATE
+LINE 1: UPDATE fewmore SET data = generate_series(4,9);
+ ^
+-- SRFs are not allowed in RETURNING
+INSERT INTO fewmore VALUES(1) RETURNING generate_series(1,3);
+ERROR: set-returning functions are not allowed in RETURNING
+LINE 1: INSERT INTO fewmore VALUES(1) RETURNING generate_series(1,3)...
+ ^
+-- nor standalone VALUES (but surely this is a bug?)
+VALUES(1, generate_series(1,2));
+ERROR: set-returning functions are not allowed in VALUES
+LINE 1: VALUES(1, generate_series(1,2));
+ ^
+-- We allow tSRFs that are not at top level
+SELECT int4mul(generate_series(1,2), 10);
+ int4mul
+---------
+ 10
+ 20
+(2 rows)
+
+SELECT generate_series(1,3) IS DISTINCT FROM 2;
+ ?column?
+----------
+ t
+ f
+ t
+(3 rows)
+
+-- but SRFs in function RTEs must be at top level (annoying restriction)
+SELECT * FROM int4mul(generate_series(1,2), 10);
+ERROR: set-returning functions must appear at top level of FROM
+LINE 1: SELECT * FROM int4mul(generate_series(1,2), 10);
+ ^
+-- DISTINCT ON is evaluated before tSRF evaluation if SRF is not
+-- referenced either in ORDER BY or in the DISTINCT ON list. The ORDER
+-- BY reference can be implicitly generated, if there's no other ORDER BY.
+-- implicit reference (via implicit ORDER) to all columns
+SELECT DISTINCT ON (a) a, b, generate_series(1,3) g
+FROM (VALUES (3, 2), (3,1), (1,1), (1,4), (5,3), (5,1)) AS t(a, b);
+ a | b | g
+---+---+---
+ 1 | 1 | 1
+ 3 | 2 | 1
+ 5 | 3 | 1
+(3 rows)
+
+-- unreferenced in DISTINCT ON or ORDER BY
+SELECT DISTINCT ON (a) a, b, generate_series(1,3) g
+FROM (VALUES (3, 2), (3,1), (1,1), (1,4), (5,3), (5,1)) AS t(a, b)
+ORDER BY a, b DESC;
+ a | b | g
+---+---+---
+ 1 | 4 | 1
+ 1 | 4 | 2
+ 1 | 4 | 3
+ 3 | 2 | 1
+ 3 | 2 | 2
+ 3 | 2 | 3
+ 5 | 3 | 1
+ 5 | 3 | 2
+ 5 | 3 | 3
+(9 rows)
+
+-- referenced in ORDER BY
+SELECT DISTINCT ON (a) a, b, generate_series(1,3) g
+FROM (VALUES (3, 2), (3,1), (1,1), (1,4), (5,3), (5,1)) AS t(a, b)
+ORDER BY a, b DESC, g DESC;
+ a | b | g
+---+---+---
+ 1 | 4 | 3
+ 3 | 2 | 3
+ 5 | 3 | 3
+(3 rows)
+
+-- referenced in ORDER BY and DISTINCT ON
+SELECT DISTINCT ON (a, b, g) a, b, generate_series(1,3) g
+FROM (VALUES (3, 2), (3,1), (1,1), (1,4), (5,3), (5,1)) AS t(a, b)
+ORDER BY a, b DESC, g DESC;
+ a | b | g
+---+---+---
+ 1 | 4 | 3
+ 1 | 4 | 2
+ 1 | 4 | 1
+ 1 | 1 | 3
+ 1 | 1 | 2
+ 1 | 1 | 1
+ 3 | 2 | 3
+ 3 | 2 | 2
+ 3 | 2 | 1
+ 3 | 1 | 3
+ 3 | 1 | 2
+ 3 | 1 | 1
+ 5 | 3 | 3
+ 5 | 3 | 2
+ 5 | 3 | 1
+ 5 | 1 | 3
+ 5 | 1 | 2
+ 5 | 1 | 1
+(18 rows)
+
+-- only SRF mentioned in DISTINCT ON
+SELECT DISTINCT ON (g) a, b, generate_series(1,3) g
+FROM (VALUES (3, 2), (3,1), (1,1), (1,4), (5,3), (5,1)) AS t(a, b);
+ a | b | g
+---+---+---
+ 3 | 2 | 1
+ 5 | 1 | 2
+ 3 | 1 | 3
+(3 rows)
+
+-- LIMIT / OFFSET is evaluated after SRF evaluation
+SELECT a, generate_series(1,2) FROM (VALUES(1),(2),(3)) r(a) LIMIT 2 OFFSET 2;
+ a | generate_series
+---+-----------------
+ 2 | 1
+ 2 | 2
+(2 rows)
+
+-- SRFs are not allowed in LIMIT.
+SELECT 1 LIMIT generate_series(1,3);
+ERROR: set-returning functions are not allowed in LIMIT
+LINE 1: SELECT 1 LIMIT generate_series(1,3);
+ ^
+-- tSRF in correlated subquery, referencing table outside
+SELECT (SELECT generate_series(1,3) LIMIT 1 OFFSET few.id) FROM few;
+ generate_series
+-----------------
+ 2
+ 3
+
+(3 rows)
+
+-- tSRF in correlated subquery, referencing SRF outside
+SELECT (SELECT generate_series(1,3) LIMIT 1 OFFSET g.i) FROM generate_series(0,3) g(i);
+ generate_series
+-----------------
+ 1
+ 2
+ 3
+
+(4 rows)
+
+-- Operators can return sets too
+CREATE OPERATOR |@| (PROCEDURE = unnest, RIGHTARG = ANYARRAY);
+SELECT |@|ARRAY[1,2,3];
+ ?column?
+----------
+ 1
+ 2
+ 3
+(3 rows)
+
+-- Some fun cases involving duplicate SRF calls
+explain (verbose, costs off)
+select generate_series(1,3) as x, generate_series(1,3) + 1 as xp1;
+ QUERY PLAN
+------------------------------------------------------------------
+ Result
+ Output: (generate_series(1, 3)), ((generate_series(1, 3)) + 1)
+ -> ProjectSet
+ Output: generate_series(1, 3)
+ -> Result
+(5 rows)
+
+select generate_series(1,3) as x, generate_series(1,3) + 1 as xp1;
+ x | xp1
+---+-----
+ 1 | 2
+ 2 | 3
+ 3 | 4
+(3 rows)
+
+explain (verbose, costs off)
+select generate_series(1,3)+1 order by generate_series(1,3);
+ QUERY PLAN
+------------------------------------------------------------------------
+ Sort
+ Output: (((generate_series(1, 3)) + 1)), (generate_series(1, 3))
+ Sort Key: (generate_series(1, 3))
+ -> Result
+ Output: ((generate_series(1, 3)) + 1), (generate_series(1, 3))
+ -> ProjectSet
+ Output: generate_series(1, 3)
+ -> Result
+(8 rows)
+
+select generate_series(1,3)+1 order by generate_series(1,3);
+ ?column?
+----------
+ 2
+ 3
+ 4
+(3 rows)
+
+-- Check that SRFs of same nesting level run in lockstep
+explain (verbose, costs off)
+select generate_series(1,3) as x, generate_series(3,6) + 1 as y;
+ QUERY PLAN
+------------------------------------------------------------------
+ Result
+ Output: (generate_series(1, 3)), ((generate_series(3, 6)) + 1)
+ -> ProjectSet
+ Output: generate_series(1, 3), generate_series(3, 6)
+ -> Result
+(5 rows)
+
+select generate_series(1,3) as x, generate_series(3,6) + 1 as y;
+ x | y
+---+---
+ 1 | 4
+ 2 | 5
+ 3 | 6
+ | 7
+(4 rows)
+
+-- Clean up
+DROP TABLE few;
+DROP TABLE fewmore;
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-20 07:34:56 +0000