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Fix the min/max optimizer so that it works when the FROM clause is a

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subquery.  Ticket #658. (CVS 1293)

FossilOrigin-Name: 31c94acc72d318b5dec0fef1485621943add45c8
This commit is contained in:
drh
2004-03-13 14:00:36 +00:00
parent 1a72d72a7f
commit 6e17529e97
5 changed files with 55 additions and 30 deletions
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19
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 1.8 2004/02/25 13:47:34 drh Exp $
# $Id: minmax.test,v 1.9 2004/03/13 14:00:37 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@ -258,5 +258,22 @@ do_test minmax-8.2 {
}
} {34 1234}
# Ticket #658: Test the min()/max() optimization when the FROM clause
# is a subquery.
#
do_test minmax-9.1 {
execsql {
SELECT max(rowid) FROM (
SELECT max(rowid) FROM t4 UNION SELECT max(rowid) FROM t5
)
}
} {1}
do_test minmax-9.2 {
execsql {
SELECT max(rowid) FROM (
SELECT max(rowid) FROM t4 EXCEPT SELECT max(rowid) FROM t5
)
}
} {{}}
finish_test