502 lines
13 KiB
Plaintext
502 lines
13 KiB
Plaintext
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--
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-- tsrf - targetlist set returning function tests
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--
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-- simple srf
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SELECT generate_series(1, 3);
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generate_series
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-----------------
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1
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2
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3
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(3 rows)
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-- parallel iteration
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SELECT generate_series(1, 3), generate_series(3,5);
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generate_series | generate_series
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-----------------+-----------------
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1 | 3
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2 | 4
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3 | 5
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(3 rows)
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-- parallel iteration, different number of rows
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SELECT generate_series(1, 2), generate_series(1,4);
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generate_series | generate_series
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-----------------+-----------------
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1 | 1
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2 | 2
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1 | 3
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2 | 4
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(4 rows)
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-- srf, with SRF argument
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SELECT generate_series(1, generate_series(1, 3));
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generate_series
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-----------------
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1
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1
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2
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1
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2
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3
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(6 rows)
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-- srf, with two SRF arguments
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SELECT generate_series(generate_series(1,3), generate_series(2, 4));
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ERROR: functions and operators can take at most one set argument
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CREATE TABLE few(id int, dataa text, datab text);
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INSERT INTO few VALUES(1, 'a', 'foo'),(2, 'a', 'bar'),(3, 'b', 'bar');
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-- SRF output order of sorting is maintained, if SRF is not referenced
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SELECT few.id, generate_series(1,3) g FROM few ORDER BY id DESC;
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id | g
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----+---
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3 | 1
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3 | 2
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3 | 3
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2 | 1
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2 | 2
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2 | 3
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1 | 1
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1 | 2
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1 | 3
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(9 rows)
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-- but SRFs can be referenced in sort
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SELECT few.id, generate_series(1,3) g FROM few ORDER BY id, g DESC;
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id | g
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----+---
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1 | 3
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1 | 2
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1 | 1
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2 | 3
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2 | 2
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2 | 1
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3 | 3
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3 | 2
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3 | 1
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(9 rows)
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SELECT few.id, generate_series(1,3) g FROM few ORDER BY id, generate_series(1,3) DESC;
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id | g
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----+---
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1 | 3
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1 | 2
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1 | 1
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2 | 3
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2 | 2
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2 | 1
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3 | 3
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3 | 2
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3 | 1
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(9 rows)
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-- it's weird to have ORDER BYs that increase the number of results
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SELECT few.id FROM few ORDER BY id, generate_series(1,3) DESC;
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id
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----
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1
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1
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1
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2
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2
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2
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3
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3
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3
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(9 rows)
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-- SRFs are computed after aggregation
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SELECT few.dataa, count(*), min(id), max(id), unnest('{1,1,3}'::int[]) FROM few WHERE few.id = 1 GROUP BY few.dataa;
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dataa | count | min | max | unnest
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-------+-------+-----+-----+--------
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a | 1 | 1 | 1 | 1
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a | 1 | 1 | 1 | 1
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a | 1 | 1 | 1 | 3
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(3 rows)
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-- unless referenced in GROUP BY clause
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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[]);
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dataa | count | min | max | unnest
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-------+-------+-----+-----+--------
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a | 2 | 1 | 1 | 1
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a | 1 | 1 | 1 | 3
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(2 rows)
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SELECT few.dataa, count(*), min(id), max(id), unnest('{1,1,3}'::int[]) FROM few WHERE few.id = 1 GROUP BY few.dataa, 5;
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dataa | count | min | max | unnest
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-------+-------+-----+-----+--------
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a | 2 | 1 | 1 | 1
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a | 1 | 1 | 1 | 3
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(2 rows)
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-- check HAVING works when GROUP BY does [not] reference SRF output
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SELECT dataa, generate_series(1,3), count(*) FROM few GROUP BY 1 HAVING count(*) > 1;
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dataa | generate_series | count
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-------+-----------------+-------
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a | 1 | 2
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a | 2 | 2
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a | 3 | 2
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(3 rows)
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SELECT dataa, generate_series(1,3), count(*) FROM few GROUP BY 1, 2 HAVING count(*) > 1;
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dataa | generate_series | count
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-------+-----------------+-------
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a | 1 | 2
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a | 2 | 2
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a | 3 | 2
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(3 rows)
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-- it's weird to have GROUP BYs that increase the number of results
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SELECT few.dataa, count(*), min(id), max(id) FROM few GROUP BY few.dataa;
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dataa | count | min | max
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-------+-------+-----+-----
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b | 1 | 3 | 3
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a | 2 | 1 | 2
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(2 rows)
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SELECT few.dataa, count(*), min(id), max(id) FROM few GROUP BY few.dataa, unnest('{1,1,3}'::int[]);
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dataa | count | min | max
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-------+-------+-----+-----
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b | 2 | 3 | 3
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a | 4 | 1 | 2
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b | 1 | 3 | 3
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a | 2 | 1 | 2
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(4 rows)
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-- SRFs are not allowed in aggregate arguments
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SELECT min(generate_series(1, 3)) FROM few;
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ERROR: set-valued function called in context that cannot accept a set
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-- SRFs are normally computed after window functions
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SELECT id,lag(id) OVER(), count(*) OVER(), generate_series(1,3) FROM few;
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id | lag | count | generate_series
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----+-----+-------+-----------------
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1 | | 3 | 1
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1 | | 3 | 2
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1 | | 3 | 3
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2 | 1 | 3 | 1
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2 | 1 | 3 | 2
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2 | 1 | 3 | 3
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3 | 2 | 3 | 1
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3 | 2 | 3 | 2
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3 | 2 | 3 | 3
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(9 rows)
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-- unless referencing SRFs
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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;
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sum | g
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-----+---
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3 | 1
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3 | 2
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3 | 3
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(3 rows)
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-- sorting + grouping
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SELECT few.dataa, count(*), min(id), max(id), generate_series(1,3) FROM few GROUP BY few.dataa ORDER BY 5;
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dataa | count | min | max | generate_series
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-------+-------+-----+-----+-----------------
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b | 1 | 3 | 3 | 1
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a | 2 | 1 | 2 | 1
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b | 1 | 3 | 3 | 2
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a | 2 | 1 | 2 | 2
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b | 1 | 3 | 3 | 3
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a | 2 | 1 | 2 | 3
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(6 rows)
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-- grouping sets are a bit special, they produce NULLs in columns not actually NULL
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SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab);
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dataa | b | g | count
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-------+-----+---+-------
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a | bar | 1 | 1
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a | bar | 2 | 1
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a | foo | 1 | 1
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a | foo | 2 | 1
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a | | 1 | 2
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a | | 2 | 2
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b | bar | 1 | 1
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b | bar | 2 | 1
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b | | 1 | 1
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b | | 2 | 1
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| | 1 | 3
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| | 2 | 3
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| bar | 1 | 2
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| bar | 2 | 2
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| foo | 1 | 1
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| foo | 2 | 1
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(16 rows)
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SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab) ORDER BY dataa;
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dataa | b | g | count
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-------+-----+---+-------
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a | bar | 1 | 1
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a | bar | 2 | 1
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a | foo | 1 | 1
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a | foo | 2 | 1
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a | | 1 | 2
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a | | 2 | 2
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b | bar | 1 | 1
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b | bar | 2 | 1
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b | | 1 | 1
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b | | 2 | 1
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| | 1 | 3
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| | 2 | 3
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| bar | 1 | 2
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| bar | 2 | 2
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| foo | 1 | 1
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| foo | 2 | 1
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(16 rows)
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SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab) ORDER BY g;
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dataa | b | g | count
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-------+-----+---+-------
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a | bar | 1 | 1
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a | foo | 1 | 1
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a | | 1 | 2
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b | bar | 1 | 1
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b | | 1 | 1
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| | 1 | 3
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| bar | 1 | 2
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| foo | 1 | 1
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| foo | 2 | 1
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a | bar | 2 | 1
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b | | 2 | 1
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a | foo | 2 | 1
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| bar | 2 | 2
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a | | 2 | 2
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| | 2 | 3
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b | bar | 2 | 1
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(16 rows)
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SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab, g);
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dataa | b | g | count
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-------+-----+---+-------
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a | bar | 1 | 1
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a | bar | 2 | 1
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a | bar | | 2
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a | foo | 1 | 1
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a | foo | 2 | 1
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a | foo | | 2
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a | | | 4
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b | bar | 1 | 1
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b | bar | 2 | 1
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b | bar | | 2
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b | | | 2
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a | | 1 | 2
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b | | 1 | 1
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| | 1 | 3
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a | | 2 | 2
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b | | 2 | 1
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| | 2 | 3
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| bar | 1 | 2
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| bar | 2 | 2
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| bar | | 4
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| foo | 1 | 1
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| foo | 2 | 1
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| foo | | 2
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(24 rows)
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SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab, g) ORDER BY dataa;
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dataa | b | g | count
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-------+-----+---+-------
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a | bar | 1 | 1
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a | bar | 2 | 1
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a | bar | | 2
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a | foo | 1 | 1
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a | foo | 2 | 1
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a | foo | | 2
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a | | | 4
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a | | 1 | 2
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a | | 2 | 2
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b | bar | 2 | 1
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b | | | 2
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b | | 1 | 1
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b | | 2 | 1
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b | bar | 1 | 1
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b | bar | | 2
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| foo | | 2
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| foo | 1 | 1
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| | 2 | 3
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| bar | 1 | 2
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| bar | 2 | 2
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| | | 6
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| foo | 2 | 1
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| bar | | 4
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| | 1 | 3
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(24 rows)
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SELECT dataa, datab b, generate_series(1,2) g, count(*) FROM few GROUP BY CUBE(dataa, datab, g) ORDER BY g;
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dataa | b | g | count
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-------+-----+---+-------
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a | bar | 1 | 1
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a | foo | 1 | 1
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b | bar | 1 | 1
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a | | 1 | 2
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b | | 1 | 1
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| | 1 | 3
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| bar | 1 | 2
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| foo | 1 | 1
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| foo | 2 | 1
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| bar | 2 | 2
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a | | 2 | 2
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b | | 2 | 1
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a | bar | 2 | 1
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| | 2 | 3
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a | foo | 2 | 1
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b | bar | 2 | 1
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a | foo | | 2
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b | bar | | 2
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b | | | 2
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a | | | 4
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| bar | | 4
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| foo | | 2
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a | bar | | 2
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(24 rows)
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-- data modification
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CREATE TABLE fewmore AS SELECT generate_series(1,3) AS data;
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INSERT INTO fewmore VALUES(generate_series(4,5));
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SELECT * FROM fewmore;
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data
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------
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1
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2
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3
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4
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5
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(5 rows)
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-- nonsense that seems to be allowed
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UPDATE fewmore SET data = generate_series(4,9);
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-- SRFs are not allowed in RETURNING
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INSERT INTO fewmore VALUES(1) RETURNING generate_series(1,3);
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ERROR: set-valued function called in context that cannot accept a set
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-- nor aggregate arguments
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SELECT count(generate_series(1,3)) FROM few;
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ERROR: set-valued function called in context that cannot accept a set
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-- nor proper VALUES
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VALUES(1, generate_series(1,2));
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ERROR: set-valued function called in context that cannot accept a set
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-- DISTINCT ON is evaluated before tSRF evaluation if SRF is not
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-- referenced either in ORDER BY or in the DISTINCT ON list. The ORDER
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-- BY reference can be implicitly generated, if there's no other ORDER BY.
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-- implicit reference (via implicit ORDER) to all columns
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SELECT DISTINCT ON (a) a, b, generate_series(1,3) g
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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: argument of LIMIT must not return a set
|
||
|
|
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)
|
||
|
|
|
||
|
|
-- Clean up
|
||
|
|
DROP TABLE few;
|
||
|
|
DROP TABLE fewmore;
|