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The LIKE optimization does the right thing when collating sequences are

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present.  LIKE expressions where the left-hand side has COLLATE NOCASE
are optimized in the default case. (CVS 2637)

FossilOrigin-Name: ef84ff795c85e9d28f1cac84ff42d8d4ef84cfc4
This commit is contained in:
drh
2005-08-28 17:00:23 +00:00
parent bfd6b03554
commit d64fe2f374
9 changed files with 126 additions and 34 deletions
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55
test/like.test
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@@ -13,7 +13,7 @@
# in particular the optimizations that occur to help those operators
# run faster.
#
# $Id: like.test,v 1.2 2005/08/19 00:14:43 drh Exp $
# $Id: like.test,v 1.3 2005/08/28 17:00:26 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@@ -312,5 +312,58 @@ do_test like-4.6 {
set sqlite_like_count
} 12
# Collating sequences on the index disable the LIKE optimization.
# Or if the NOCASE collating sequence is used, the LIKE optimization
# is enabled when case_sensitive_like is OFF.
#
do_test like-5.1 {
execsql {PRAGMA case_sensitive_like=off}
set sqlite_like_count 0
queryplan {
SELECT x FROM t1 WHERE x LIKE 'abc%' ORDER BY 1
}
} {ABC {ABC abc xyz} abc abcd nosort {} i1}
do_test like-5.2 {
set sqlite_like_count
} 12
do_test like-5.3 {
execsql {
CREATE TABLE t2(x COLLATE NOCASE);
INSERT INTO t2 SELECT * FROM t1;
CREATE INDEX i2 ON t2(x COLLATE NOCASE);
}
set sqlite_like_count 0
queryplan {
SELECT x FROM t2 WHERE x LIKE 'abc%' ORDER BY 1
}
} {abc ABC {ABC abc xyz} abcd nosort {} i2}
do_test like-5.4 {
set sqlite_like_count
} 0
do_test like-5.5 {
execsql {
PRAGMA case_sensitive_like=on;
}
set sqlite_like_count 0
queryplan {
SELECT x FROM t2 WHERE x LIKE 'abc%' ORDER BY 1
}
} {abc abcd nosort {} i2}
do_test like-5.6 {
set sqlite_like_count
} 12
do_test like-5.7 {
execsql {
PRAGMA case_sensitive_like=off;
}
set sqlite_like_count 0
queryplan {
SELECT x FROM t2 WHERE x GLOB 'abc*' ORDER BY 1
}
} {abc abcd nosort {} i2}
do_test like-5.8 {
set sqlite_like_count
} 12
finish_test