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Fix a problem with NULL handling in aggregate min/max when returning

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values from the row containing the min or max.

FossilOrigin-Name: f27c7b4fb193126548e6a620ac89664d1efa3856
This commit is contained in:
drh
2012-02-02 18:42:09 +00:00
parent 7a95789c0c
commit 94a6d998f6
5 changed files with 159 additions and 15 deletions
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145
test/minmax4.test Normal file
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@ -0,0 +1,145 @@
# 2012 February 02
#
# 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.
#
#***********************************************************************
#
# Test for queries of the form:
#
# SELECT p, max(q) FROM t1;
#
# Demonstration that the value returned for p is on the same row as
# the maximum q.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
do_test minmax4-1.1 {
db eval {
CREATE TABLE t1(p,q);
SELECT p, max(q) FROM t1;
}
} {{} {}}
do_test minmax4-1.2 {
db eval {
SELECT p, min(q) FROM t1;
}
} {{} {}}
do_test minmax4-1.3 {
db eval {
INSERT INTO t1 VALUES(1,2);
SELECT p, max(q) FROM t1;
}
} {1 2}
do_test minmax4-1.4 {
db eval {
SELECT p, min(q) FROM t1;
}
} {1 2}
do_test minmax4-1.5 {
db eval {
INSERT INTO t1 VALUES(3,4);
SELECT p, max(q) FROM t1;
}
} {3 4}
do_test minmax4-1.6 {
db eval {
SELECT p, min(q) FROM t1;
}
} {1 2}
do_test minmax4-1.7 {
db eval {
INSERT INTO t1 VALUES(5,0);
SELECT p, max(q) FROM t1;
}
} {3 4}
do_test minmax4-1.8 {
db eval {
SELECT p, min(q) FROM t1;
}
} {5 0}
do_test minmax4-1.9 {
db eval {
INSERT INTO t1 VALUES(6,1);
SELECT p, max(q) FROM t1;
}
} {3 4}
do_test minmax4-1.10 {
db eval {
SELECT p, min(q) FROM t1;
}
} {5 0}
do_test minmax4-1.11 {
db eval {
INSERT INTO t1 VALUES(7,NULL);
SELECT p, max(q) FROM t1;
}
} {3 4}
do_test minmax4-1.12 {
db eval {
SELECT p, min(q) FROM t1;
}
} {5 0}
do_test minmax4-1.13 {
db eval {
DELETE FROM t1 WHERE q IS NOT NULL;
SELECT p, max(q) FROM t1;
}
} {7 {}}
do_test minmax4-1.14 {
db eval {
SELECT p, min(q) FROM t1;
}
} {7 {}}
do_test minmax4-2.1 {
db eval {
CREATE TABLE t2(a,b,c);
INSERT INTO t2 VALUES
(1,null,2),
(1,2,3),
(1,1,4),
(2,3,5);
SELECT a, max(b), c FROM t2 GROUP BY a ORDER BY a;
}
} {1 2 3 2 3 5}
do_test minmax4-2.2 {
db eval {
SELECT a, min(b), c FROM t2 GROUP BY a ORDER BY a;
}
} {1 1 4 2 3 5}
do_test minmax4-2.3 {
db eval {
SELECT a, min(b), avg(b), count(b), c FROM t2 GROUP BY a ORDER BY a DESC;
}
} {2 3 3.0 1 5 1 1 1.5 2 4}
do_test minmax4-2.4 {
db eval {
SELECT a, min(b), max(b), c FROM t2 GROUP BY a ORDER BY a;
}
} {1 1 2 3 2 3 3 5}
do_test minmax4-2.5 {
db eval {
SELECT a, max(b), min(b), c FROM t2 GROUP BY a ORDER BY a;
}
} {1 2 1 4 2 3 3 5}
do_test minmax4-2.6 {
db eval {
SELECT a, max(b), b, max(c), c FROM t2 GROUP BY a ORDER BY a;
}
} {1 2 1 4 4 2 3 3 5 5}
do_test minmax4-2.7 {
db eval {
SELECT a, min(b), b, min(c), c FROM t2 GROUP BY a ORDER BY a;
}
} {1 1 {} 2 2 2 3 3 5 5}
finish_test