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Refinements to NULL processing: NULLs are indistinct for DISTINCT and UNION.

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Multiplying a NULL by zero yields zero. In a CASE expression, a NULL comparison
is considered false, not NULL.  With these changes, NULLs in SQLite now work
the same as in PostgreSQL and in Oracle. (CVS 600)

FossilOrigin-Name: da61aa1d238539dff9c43fd9f464d311e28d669f
This commit is contained in:
drh
2002-05-31 15:51:25 +00:00
parent 0f89253e21
commit f570f011eb
11 changed files with 279 additions and 59 deletions
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16
test/minmax.test
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@ -13,7 +13,7 @@
# aggregate min() and max() functions and which are handled as
# as a special case.
#
# $Id: minmax.test,v 1.3 2002/05/29 23:22:23 drh Exp $
# $Id: minmax.test,v 1.4 2002/05/31 15:51:26 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@ -128,5 +128,19 @@ do_test minmax-4.1 {
(SELECT * FROM t1 UNION SELECT NULL as 'x', NULL as 'y')
}
} {1 20}
do_test minmax-4.2 {
execsql {
SELECT y, sum(x) FROM
(SELECT null, y+1 FROM t1 UNION SELECT * FROM t1)
GROUP BY y ORDER BY y;
}
} {1 1 2 5 3 22 4 92 5 90 6 0}
do_test minmax-4.3 {
execsql {
SELECT y, count(x), count(*) FROM
(SELECT null, y+1 FROM t1 UNION SELECT * FROM t1)
GROUP BY y ORDER BY y;
}
} {1 1 1 2 2 3 3 4 5 4 8 9 5 5 6 6 0 1}
finish_test