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Do more aggressive optimization of the AND operator where one side or the

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other is always false.

FossilOrigin-Name: f9a7e179cbbeeab5e57bbf392bef89750215546b
This commit is contained in:
drh
2012-03-31 02:34:35 +00:00
parent 00fa55d7da
commit 5fb52caadf
4 changed files with 56 additions and 12 deletions
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14
test/in.test
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@ -258,17 +258,29 @@ do_test in-7.5 {
SELECT a FROM t1 WHERE a IN (5) AND b NOT IN ();
}
} {5}
do_test in-7.6 {
do_test in-7.6.1 {
execsql {
SELECT a FROM ta WHERE a IN ();
}
} {}
do_test in-7.6.2 {
db status step
} {0}
do_test in-7.7 {
execsql {
SELECT a FROM ta WHERE a NOT IN ();
}
} {1 2 3 4 6 8 10}
do_test in-7.8.1 {
execsql {
SELECT * FROM ta LEFT JOIN tb ON (ta.b=tb.b) WHERE ta.a IN ();
}
} {}
do_test in-7.8.2 {
db status step
} {0}
do_test in-8.1 {
execsql {
SELECT b FROM t1 WHERE a IN ('hello','there')