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Experimental implementation of FILTER clause for aggregate functions.

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dan
2019-07-02 11:56:47 +00:00
parent 00a6153faf
commit 6ba7ab0d25
12 changed files with 342 additions and 45 deletions
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test/filter2.tcl Normal file
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# 2018 May 19
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
#
# May you do good and not evil.
# May you find forgiveness for yourself and forgive others.
# May you share freely, never taking more than you give.
#
#***********************************************************************
#
source [file join [file dirname $argv0] pg_common.tcl]
#=========================================================================
start_test filter2 "2019 July 2"
ifcapable !windowfunc
execsql_test 1.0 {
DROP TABLE IF EXISTS t1;
CREATE TABLE t1(a INTEGER PRIMARY KEY, b INTEGER);
INSERT INTO t1 VALUES
(1, 7), (2, 3), (3, 5), (4, 30), (5, 26), (6, 23), (7, 27),
(8, 3), (9, 17), (10, 26), (11, 33), (12, 25), (13, NULL), (14, 47),
(15, 36), (16, 13), (17, 45), (18, 31), (19, 11), (20, 36), (21, 37),
(22, 21), (23, 22), (24, 14), (25, 16), (26, 3), (27, 7), (28, 29),
(29, 50), (30, 38), (31, 3), (32, 36), (33, 12), (34, 4), (35, 46),
(36, 3), (37, 48), (38, 23), (39, NULL), (40, 24), (41, 5), (42, 46),
(43, 11), (44, NULL), (45, 18), (46, 25), (47, 15), (48, 18), (49, 23);
}
execsql_test 1.1 { SELECT sum(b) FROM t1 }
execsql_test 1.2 { SELECT sum(b) FILTER (WHERE a<10) FROM t1 }
execsql_test 1.3 { SELECT count(DISTINCT b) FROM t1 }
execsql_test 1.4 { SELECT count(DISTINCT b) FILTER (WHERE a!=19) FROM t1 }
execsql_test 1.5 {
SELECT min(b) FILTER (WHERE a>19),
min(b) FILTER (WHERE a>0),
max(a+b) FILTER (WHERE a>19),
max(b+a) FILTER (WHERE a BETWEEN 10 AND 40)
FROM t1;
}
execsql_test 1.6 {
SELECT min(b),
min(b),
max(a+b),
max(b+a)
FROM t1
GROUP BY (a%10)
ORDER BY 1, 2, 3, 4;
}
execsql_test 1.7 {
SELECT min(b) FILTER (WHERE a>19),
min(b) FILTER (WHERE a>0),
max(a+b) FILTER (WHERE a>19),
max(b+a) FILTER (WHERE a BETWEEN 10 AND 40)
FROM t1
GROUP BY (a%10)
ORDER BY 1, 2, 3, 4;
}
finish_test