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f73999262e
The function converted the first argument i.e. the number of tuples to return into an unsigned integer which turns out to be huge number when a negative value is passed. This causes the function to take much longer time to execute. Instead, reject a negative value. (If someone really wants to generate many more result rows, they should consider adding a bigint or numeric variant.) While at it, improve SQL test to test the number of tuples returned by this function. Author: Ashutosh Bapat <ashutosh.bapat@2ndquadrant.com> Discussion: https://www.postgresql.org/message-id/CAG-ACPW3PUUmSnM6cLa9Rw4BEC5cEMKjX8Gogc8gvQcT3cYA1A@mail.gmail.com
431 lines
20 KiB
Plaintext
431 lines
20 KiB
Plaintext
CREATE EXTENSION tablefunc;
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--
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-- normal_rand()
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-- no easy way to do this for regression testing
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--
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SELECT avg(normal_rand)::int, count(*) FROM normal_rand(100, 250, 0.2);
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avg | count
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-----+-------
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250 | 100
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(1 row)
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-- negative number of tuples
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SELECT avg(normal_rand)::int, count(*) FROM normal_rand(-1, 250, 0.2);
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ERROR: number of rows cannot be negative
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--
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-- crosstab()
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--
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CREATE TABLE ct(id int, rowclass text, rowid text, attribute text, val text);
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\copy ct from 'data/ct.data'
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SELECT * FROM crosstab2('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') ORDER BY 1,2;');
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row_name | category_1 | category_2
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----------+------------+------------
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test1 | val2 | val3
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test2 | val6 | val7
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| val10 | val11
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(3 rows)
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SELECT * FROM crosstab3('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') ORDER BY 1,2;');
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row_name | category_1 | category_2 | category_3
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----------+------------+------------+------------
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test1 | val2 | val3 |
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test2 | val6 | val7 |
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| val10 | val11 |
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(3 rows)
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SELECT * FROM crosstab4('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') ORDER BY 1,2;');
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row_name | category_1 | category_2 | category_3 | category_4
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----------+------------+------------+------------+------------
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test1 | val2 | val3 | |
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test2 | val6 | val7 | |
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| val10 | val11 | |
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(3 rows)
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SELECT * FROM crosstab2('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' ORDER BY 1,2;');
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row_name | category_1 | category_2
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----------+------------+------------
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test1 | val1 | val2
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test2 | val5 | val6
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| val9 | val10
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(3 rows)
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SELECT * FROM crosstab3('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' ORDER BY 1,2;');
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row_name | category_1 | category_2 | category_3
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----------+------------+------------+------------
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test1 | val1 | val2 | val3
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test2 | val5 | val6 | val7
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| val9 | val10 | val11
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(3 rows)
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SELECT * FROM crosstab4('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' ORDER BY 1,2;');
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row_name | category_1 | category_2 | category_3 | category_4
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----------+------------+------------+------------+------------
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test1 | val1 | val2 | val3 | val4
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test2 | val5 | val6 | val7 | val8
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| val9 | val10 | val11 | val12
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(3 rows)
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SELECT * FROM crosstab2('SELECT rowid, attribute, val FROM ct where rowclass = ''group2'' and (attribute = ''att1'' or attribute = ''att2'') ORDER BY 1,2;');
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row_name | category_1 | category_2
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----------+------------+------------
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test3 | val1 | val2
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test4 | val4 | val5
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(2 rows)
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SELECT * FROM crosstab3('SELECT rowid, attribute, val FROM ct where rowclass = ''group2'' and (attribute = ''att1'' or attribute = ''att2'') ORDER BY 1,2;');
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row_name | category_1 | category_2 | category_3
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----------+------------+------------+------------
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test3 | val1 | val2 |
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test4 | val4 | val5 |
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(2 rows)
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SELECT * FROM crosstab4('SELECT rowid, attribute, val FROM ct where rowclass = ''group2'' and (attribute = ''att1'' or attribute = ''att2'') ORDER BY 1,2;');
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row_name | category_1 | category_2 | category_3 | category_4
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----------+------------+------------+------------+------------
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test3 | val1 | val2 | |
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test4 | val4 | val5 | |
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(2 rows)
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SELECT * FROM crosstab2('SELECT rowid, attribute, val FROM ct where rowclass = ''group2'' ORDER BY 1,2;');
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row_name | category_1 | category_2
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----------+------------+------------
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test3 | val1 | val2
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test4 | val4 | val5
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(2 rows)
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SELECT * FROM crosstab3('SELECT rowid, attribute, val FROM ct where rowclass = ''group2'' ORDER BY 1,2;');
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row_name | category_1 | category_2 | category_3
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----------+------------+------------+------------
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test3 | val1 | val2 | val3
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test4 | val4 | val5 | val6
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(2 rows)
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SELECT * FROM crosstab4('SELECT rowid, attribute, val FROM ct where rowclass = ''group2'' ORDER BY 1,2;');
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row_name | category_1 | category_2 | category_3 | category_4
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----------+------------+------------+------------+------------
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test3 | val1 | val2 | val3 |
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test4 | val4 | val5 | val6 |
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(2 rows)
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SELECT * FROM crosstab('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' ORDER BY 1,2;') AS c(rowid text, att1 text, att2 text);
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rowid | att1 | att2
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-------+------+-------
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test1 | val1 | val2
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test2 | val5 | val6
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| val9 | val10
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(3 rows)
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SELECT * FROM crosstab('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' ORDER BY 1,2;') AS c(rowid text, att1 text, att2 text, att3 text);
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rowid | att1 | att2 | att3
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-------+------+-------+-------
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test1 | val1 | val2 | val3
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test2 | val5 | val6 | val7
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| val9 | val10 | val11
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(3 rows)
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SELECT * FROM crosstab('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' ORDER BY 1,2;') AS c(rowid text, att1 text, att2 text, att3 text, att4 text);
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rowid | att1 | att2 | att3 | att4
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-------+------+-------+-------+-------
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test1 | val1 | val2 | val3 | val4
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test2 | val5 | val6 | val7 | val8
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| val9 | val10 | val11 | val12
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(3 rows)
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-- check it works with OUT parameters, too
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CREATE FUNCTION crosstab_out(text,
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OUT rowid text, OUT att1 text, OUT att2 text, OUT att3 text)
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RETURNS setof record
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AS '$libdir/tablefunc','crosstab'
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LANGUAGE C STABLE STRICT;
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SELECT * FROM crosstab_out('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' ORDER BY 1,2;');
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rowid | att1 | att2 | att3
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-------+------+-------+-------
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test1 | val1 | val2 | val3
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test2 | val5 | val6 | val7
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| val9 | val10 | val11
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(3 rows)
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--
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-- hash based crosstab
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--
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create table cth(id serial, rowid text, rowdt timestamp, attribute text, val text);
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insert into cth values(DEFAULT,'test1','01 March 2003','temperature','42');
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insert into cth values(DEFAULT,'test1','01 March 2003','test_result','PASS');
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-- the next line is intentionally left commented and is therefore a "missing" attribute
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-- insert into cth values(DEFAULT,'test1','01 March 2003','test_startdate','28 February 2003');
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insert into cth values(DEFAULT,'test1','01 March 2003','volts','2.6987');
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insert into cth values(DEFAULT,'test2','02 March 2003','temperature','53');
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insert into cth values(DEFAULT,'test2','02 March 2003','test_result','FAIL');
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insert into cth values(DEFAULT,'test2','02 March 2003','test_startdate','01 March 2003');
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insert into cth values(DEFAULT,'test2','02 March 2003','volts','3.1234');
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-- next group tests for NULL rowids
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insert into cth values(DEFAULT,NULL,'25 October 2007','temperature','57');
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insert into cth values(DEFAULT,NULL,'25 October 2007','test_result','PASS');
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insert into cth values(DEFAULT,NULL,'25 October 2007','test_startdate','24 October 2007');
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insert into cth values(DEFAULT,NULL,'25 October 2007','volts','1.41234');
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-- return attributes as plain text
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SELECT * FROM crosstab(
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'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
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'SELECT DISTINCT attribute FROM cth ORDER BY 1')
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AS c(rowid text, rowdt timestamp, temperature text, test_result text, test_startdate text, volts text);
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rowid | rowdt | temperature | test_result | test_startdate | volts
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-------+--------------------------+-------------+-------------+-----------------+---------
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test1 | Sat Mar 01 00:00:00 2003 | 42 | PASS | | 2.6987
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test2 | Sun Mar 02 00:00:00 2003 | 53 | FAIL | 01 March 2003 | 3.1234
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| Thu Oct 25 00:00:00 2007 | 57 | PASS | 24 October 2007 | 1.41234
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(3 rows)
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-- this time without rowdt
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SELECT * FROM crosstab(
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'SELECT rowid, attribute, val FROM cth ORDER BY 1',
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'SELECT DISTINCT attribute FROM cth ORDER BY 1')
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AS c(rowid text, temperature text, test_result text, test_startdate text, volts text);
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rowid | temperature | test_result | test_startdate | volts
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-------+-------------+-------------+-----------------+---------
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test1 | 42 | PASS | | 2.6987
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test2 | 53 | FAIL | 01 March 2003 | 3.1234
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| 57 | PASS | 24 October 2007 | 1.41234
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(3 rows)
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-- convert attributes to specific datatypes
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SELECT * FROM crosstab(
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'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
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'SELECT DISTINCT attribute FROM cth ORDER BY 1')
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AS c(rowid text, rowdt timestamp, temperature int4, test_result text, test_startdate timestamp, volts float8);
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rowid | rowdt | temperature | test_result | test_startdate | volts
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-------+--------------------------+-------------+-------------+--------------------------+---------
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test1 | Sat Mar 01 00:00:00 2003 | 42 | PASS | | 2.6987
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test2 | Sun Mar 02 00:00:00 2003 | 53 | FAIL | Sat Mar 01 00:00:00 2003 | 3.1234
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| Thu Oct 25 00:00:00 2007 | 57 | PASS | Wed Oct 24 00:00:00 2007 | 1.41234
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(3 rows)
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-- source query and category query out of sync
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SELECT * FROM crosstab(
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'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
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'SELECT DISTINCT attribute FROM cth WHERE attribute IN (''temperature'',''test_result'',''test_startdate'') ORDER BY 1')
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AS c(rowid text, rowdt timestamp, temperature int4, test_result text, test_startdate timestamp);
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rowid | rowdt | temperature | test_result | test_startdate
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-------+--------------------------+-------------+-------------+--------------------------
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test1 | Sat Mar 01 00:00:00 2003 | 42 | PASS |
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test2 | Sun Mar 02 00:00:00 2003 | 53 | FAIL | Sat Mar 01 00:00:00 2003
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| Thu Oct 25 00:00:00 2007 | 57 | PASS | Wed Oct 24 00:00:00 2007
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(3 rows)
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-- if category query generates no rows, get expected error
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SELECT * FROM crosstab(
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'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
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'SELECT DISTINCT attribute FROM cth WHERE attribute = ''a'' ORDER BY 1')
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AS c(rowid text, rowdt timestamp, temperature int4, test_result text, test_startdate timestamp, volts float8);
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ERROR: provided "categories" SQL must return 1 column of at least one row
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-- if category query generates more than one column, get expected error
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SELECT * FROM crosstab(
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'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
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'SELECT DISTINCT rowdt, attribute FROM cth ORDER BY 2')
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AS c(rowid text, rowdt timestamp, temperature int4, test_result text, test_startdate timestamp, volts float8);
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ERROR: provided "categories" SQL must return 1 column of at least one row
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-- if source query returns zero rows, get zero rows returned
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SELECT * FROM crosstab(
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'SELECT rowid, rowdt, attribute, val FROM cth WHERE false ORDER BY 1',
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'SELECT DISTINCT attribute FROM cth ORDER BY 1')
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AS c(rowid text, rowdt timestamp, temperature text, test_result text, test_startdate text, volts text);
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rowid | rowdt | temperature | test_result | test_startdate | volts
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-------+-------+-------------+-------------+----------------+-------
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(0 rows)
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-- if source query returns zero rows, get zero rows returned even if category query generates no rows
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SELECT * FROM crosstab(
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'SELECT rowid, rowdt, attribute, val FROM cth WHERE false ORDER BY 1',
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'SELECT DISTINCT attribute FROM cth WHERE false ORDER BY 1')
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AS c(rowid text, rowdt timestamp, temperature text, test_result text, test_startdate text, volts text);
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rowid | rowdt | temperature | test_result | test_startdate | volts
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-------+-------+-------------+-------------+----------------+-------
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(0 rows)
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-- check it works with a named result rowtype
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create type my_crosstab_result as (
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rowid text, rowdt timestamp,
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temperature int4, test_result text, test_startdate timestamp, volts float8);
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CREATE FUNCTION crosstab_named(text, text)
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RETURNS setof my_crosstab_result
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AS '$libdir/tablefunc','crosstab_hash'
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LANGUAGE C STABLE STRICT;
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SELECT * FROM crosstab_named(
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'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
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'SELECT DISTINCT attribute FROM cth ORDER BY 1');
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rowid | rowdt | temperature | test_result | test_startdate | volts
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-------+--------------------------+-------------+-------------+--------------------------+---------
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test1 | Sat Mar 01 00:00:00 2003 | 42 | PASS | | 2.6987
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test2 | Sun Mar 02 00:00:00 2003 | 53 | FAIL | Sat Mar 01 00:00:00 2003 | 3.1234
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| Thu Oct 25 00:00:00 2007 | 57 | PASS | Wed Oct 24 00:00:00 2007 | 1.41234
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(3 rows)
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-- check it works with OUT parameters
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CREATE FUNCTION crosstab_out(text, text,
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OUT rowid text, OUT rowdt timestamp,
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OUT temperature int4, OUT test_result text,
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OUT test_startdate timestamp, OUT volts float8)
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RETURNS setof record
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AS '$libdir/tablefunc','crosstab_hash'
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LANGUAGE C STABLE STRICT;
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SELECT * FROM crosstab_out(
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'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
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'SELECT DISTINCT attribute FROM cth ORDER BY 1');
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rowid | rowdt | temperature | test_result | test_startdate | volts
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-------+--------------------------+-------------+-------------+--------------------------+---------
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test1 | Sat Mar 01 00:00:00 2003 | 42 | PASS | | 2.6987
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test2 | Sun Mar 02 00:00:00 2003 | 53 | FAIL | Sat Mar 01 00:00:00 2003 | 3.1234
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| Thu Oct 25 00:00:00 2007 | 57 | PASS | Wed Oct 24 00:00:00 2007 | 1.41234
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(3 rows)
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--
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-- connectby
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--
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-- test connectby with text based hierarchy
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CREATE TABLE connectby_text(keyid text, parent_keyid text, pos int);
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\copy connectby_text from 'data/connectby_text.data'
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-- with branch, without orderby
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SELECT * FROM connectby('connectby_text', 'keyid', 'parent_keyid', 'row2', 0, '~') AS t(keyid text, parent_keyid text, level int, branch text);
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keyid | parent_keyid | level | branch
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-------+--------------+-------+---------------------
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row2 | | 0 | row2
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row4 | row2 | 1 | row2~row4
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row6 | row4 | 2 | row2~row4~row6
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row8 | row6 | 3 | row2~row4~row6~row8
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row5 | row2 | 1 | row2~row5
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row9 | row5 | 2 | row2~row5~row9
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(6 rows)
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-- without branch, without orderby
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SELECT * FROM connectby('connectby_text', 'keyid', 'parent_keyid', 'row2', 0) AS t(keyid text, parent_keyid text, level int);
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keyid | parent_keyid | level
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-------+--------------+-------
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row2 | | 0
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row4 | row2 | 1
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row6 | row4 | 2
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row8 | row6 | 3
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row5 | row2 | 1
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row9 | row5 | 2
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(6 rows)
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-- with branch, with orderby
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SELECT * FROM connectby('connectby_text', 'keyid', 'parent_keyid', 'pos', 'row2', 0, '~') AS t(keyid text, parent_keyid text, level int, branch text, pos int) ORDER BY t.pos;
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keyid | parent_keyid | level | branch | pos
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-------+--------------+-------+---------------------+-----
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row2 | | 0 | row2 | 1
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row5 | row2 | 1 | row2~row5 | 2
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row9 | row5 | 2 | row2~row5~row9 | 3
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row4 | row2 | 1 | row2~row4 | 4
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row6 | row4 | 2 | row2~row4~row6 | 5
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row8 | row6 | 3 | row2~row4~row6~row8 | 6
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(6 rows)
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-- without branch, with orderby
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SELECT * FROM connectby('connectby_text', 'keyid', 'parent_keyid', 'pos', 'row2', 0) AS t(keyid text, parent_keyid text, level int, pos int) ORDER BY t.pos;
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keyid | parent_keyid | level | pos
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-------+--------------+-------+-----
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row2 | | 0 | 1
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row5 | row2 | 1 | 2
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row9 | row5 | 2 | 3
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row4 | row2 | 1 | 4
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row6 | row4 | 2 | 5
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row8 | row6 | 3 | 6
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(6 rows)
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-- test connectby with int based hierarchy
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CREATE TABLE connectby_int(keyid int, parent_keyid int);
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\copy connectby_int from 'data/connectby_int.data'
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-- with branch
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SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid int, parent_keyid int, level int, branch text);
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keyid | parent_keyid | level | branch
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-------+--------------+-------+---------
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2 | | 0 | 2
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4 | 2 | 1 | 2~4
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6 | 4 | 2 | 2~4~6
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8 | 6 | 3 | 2~4~6~8
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5 | 2 | 1 | 2~5
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9 | 5 | 2 | 2~5~9
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(6 rows)
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-- without branch
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SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid int, level int);
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keyid | parent_keyid | level
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-------+--------------+-------
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2 | | 0
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4 | 2 | 1
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6 | 4 | 2
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8 | 6 | 3
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5 | 2 | 1
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9 | 5 | 2
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(6 rows)
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-- recursion detection
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INSERT INTO connectby_int VALUES(10,9);
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INSERT INTO connectby_int VALUES(11,10);
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INSERT INTO connectby_int VALUES(9,11);
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-- should fail due to infinite recursion
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SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid int, parent_keyid int, level int, branch text);
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ERROR: infinite recursion detected
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-- infinite recursion failure avoided by depth limit
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SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 4, '~') AS t(keyid int, parent_keyid int, level int, branch text);
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keyid | parent_keyid | level | branch
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-------+--------------+-------+-------------
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2 | | 0 | 2
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4 | 2 | 1 | 2~4
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6 | 4 | 2 | 2~4~6
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8 | 6 | 3 | 2~4~6~8
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5 | 2 | 1 | 2~5
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9 | 5 | 2 | 2~5~9
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10 | 9 | 3 | 2~5~9~10
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11 | 10 | 4 | 2~5~9~10~11
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(8 rows)
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-- should fail as first two columns must have the same type
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SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid text, parent_keyid int, level int, branch text);
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ERROR: invalid return type
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DETAIL: First two columns must be the same type.
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-- should fail as key field datatype should match return datatype
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SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid float8, parent_keyid float8, level int, branch text);
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ERROR: invalid return type
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DETAIL: SQL key field type double precision does not match return key field type integer.
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-- tests for values using custom queries
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-- query with one column - failed
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SELECT * FROM connectby('connectby_int', '1; --', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid int, level int);
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ERROR: invalid return type
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DETAIL: Query must return at least two columns.
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-- query with two columns first value as NULL
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SELECT * FROM connectby('connectby_int', 'NULL::int, 1::int; --', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid int, level int);
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keyid | parent_keyid | level
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-------+--------------+-------
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2 | | 0
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| 1 | 1
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(2 rows)
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-- query with two columns second value as NULL
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SELECT * FROM connectby('connectby_int', '1::int, NULL::int; --', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid int, level int);
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ERROR: infinite recursion detected
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-- query with two columns, both values as NULL
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SELECT * FROM connectby('connectby_int', 'NULL::int, NULL::int; --', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid int, level int);
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keyid | parent_keyid | level
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-------+--------------+-------
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2 | | 0
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| | 1
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(2 rows)
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-- test for falsely detected recursion
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DROP TABLE connectby_int;
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CREATE TABLE connectby_int(keyid int, parent_keyid int);
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INSERT INTO connectby_int VALUES(11,NULL);
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INSERT INTO connectby_int VALUES(10,11);
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INSERT INTO connectby_int VALUES(111,11);
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INSERT INTO connectby_int VALUES(1,111);
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-- this should not fail due to recursion detection
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SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '11', 0, '-') AS t(keyid int, parent_keyid int, level int, branch text);
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keyid | parent_keyid | level | branch
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-------+--------------+-------+----------
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11 | | 0 | 11
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10 | 11 | 1 | 11-10
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111 | 11 | 1 | 11-111
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1 | 111 | 2 | 11-111-1
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(4 rows)
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