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NULL values are distinct. A comparison involving a NULL is always false.

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Operations on a NULL value yield a NULL result.  This change makes SQLite
operate more like the SQL spec, but it may break existing applications that
assumed the old behavior.  All the old tests pass but we still need to add
new tests to better verify the new behavior.  Fix for ticket #44. (CVS 589)

FossilOrigin-Name: 9051173742f1b0e15a809d12a0c9c98fd2c4614d
This commit is contained in:
drh
2002-05-26 20:54:33 +00:00
parent 195e6967fb
commit f5905aa7be
15 changed files with 485 additions and 238 deletions
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21
test/expr.test
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@ -11,7 +11,7 @@
# This file implements regression tests for SQLite library. The
# focus of this file is testing expressions.
#
# $Id: expr.test,v 1.19 2002/03/24 13:13:29 drh Exp $
# $Id: expr.test,v 1.20 2002/05/26 20:54:34 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@ -22,8 +22,7 @@ execsql {CREATE TABLE test1(i1 int, i2 int, r1 real, r2 real, t1 text, t2 text)}
execsql {INSERT INTO test1 VALUES(1,2,1.1,2.2,'hello','world')}
proc test_expr {name settings expr result} {
do_test $name [format {
execsql {UPDATE test1 SET %s}
execsql {SELECT %s FROM test1}
execsql {BEGIN; UPDATE test1 SET %s; SELECT %s FROM test1; ROLLBACK;}
} $settings $expr] $result
}
@ -63,7 +62,7 @@ test_expr expr-1.33 {i1=1, i2=2} {i1=1 OR i2=1} {1}
test_expr expr-1.34 {i1=1, i2=2} {i1=2 OR i2=2} {1}
test_expr expr-1.35 {i1=1, i2=2} {i1-i2=-1} {1}
test_expr expr-1.36 {i1=1, i2=0} {not i1} {0}
test_expr expr-1.37 {i1=1, i2=NULL} {not i2} {1}
test_expr expr-1.37 {i1=1, i2=0} {not i2} {1}
test_expr expr-1.38 {i1=1} {-i1} {-1}
test_expr expr-1.39 {i1=1} {+i1} {1}
test_expr expr-1.40 {i1=1, i2=2} {+(i2+i1)} {3}
@ -320,8 +319,8 @@ proc test_expr2 {name expr result} {
test_expr2 expr-7.2 {a<10 AND a>8} {9}
test_expr2 expr-7.3 {a<=10 AND a>=8} {8 9 10}
test_expr2 expr-7.4 {a>=8 AND a<=10} {8 9 10}
test_expr2 expr-7.5 {a>=20 OR a<=1} {{} 1 20}
test_expr2 expr-7.6 {b!=4 AND a<=3} {{} 1 3}
test_expr2 expr-7.5 {a>=20 OR a<=1} {1 20}
test_expr2 expr-7.6 {b!=4 AND a<=3} {1 3}
test_expr2 expr-7.7 {b==8 OR b==16 OR b==32} {3 4 5}
test_expr2 expr-7.8 {NOT b<>8 OR b==1024} {3 10}
test_expr2 expr-7.9 {b LIKE '10%'} {10 20}
@ -332,13 +331,13 @@ test_expr2 expr-7.13 {b GLOB '*1[456]'} {4}
test_expr2 expr-7.14 {a ISNULL} {{}}
test_expr2 expr-7.15 {a NOTNULL AND a<3} {1 2}
test_expr2 expr-7.16 {a AND a<3} {1 2}
test_expr2 expr-7.17 {NOT a} {{}}
test_expr2 expr-7.17 {NOT a} {}
test_expr2 expr-7.18 {a==11 OR (b>1000 AND b<2000)} {10 11}
test_expr2 expr-7.19 {a<=1 OR a>=20} {{} 1 20}
test_expr2 expr-7.20 {a<1 OR a>20} {{}}
test_expr2 expr-7.21 {a>19 OR a<1} {{} 20}
test_expr2 expr-7.19 {a<=1 OR a>=20} {1 20}
test_expr2 expr-7.20 {a<1 OR a>20} {}
test_expr2 expr-7.21 {a>19 OR a<1} {20}
test_expr2 expr-7.22 {a!=1 OR a=100} \
{{} 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20}
{2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20}
test_expr2 expr-7.23 {(a notnull AND a<4) OR a==8} {1 2 3 8}
test_expr2 expr-7.24 {a LIKE '2_' OR a==8} {8 20}
test_expr2 expr-7.25 {a GLOB '2?' OR a==8} {8 20}