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When using an index to scan a database table, read column data from the index in preference to the table. This increases the likelihood that the table will not be required at all. (CVS 4580)

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FossilOrigin-Name: 061608c72ac0a96eacf3b64d638235e4739f96ba
This commit is contained in:
danielk1977
2007-11-29 17:43:27 +00:00
parent 9a96b66810
commit 21de2e755c
5 changed files with 30 additions and 28 deletions
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test/where.test
+7 -7
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@@ -1,4 +1,4 @@
# 2001 September 15
# 4 2001 September 15
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
@@ -11,7 +11,7 @@
# This file implements regression tests for SQLite library. The
# focus of this file is testing the use of indices in WHERE clases.
#
# $Id: where.test,v 1.43 2007/06/25 16:29:34 danielk1977 Exp $
# $Id: where.test,v 1.44 2007/11/29 17:43:28 danielk1977 Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@@ -184,7 +184,7 @@ do_test where-1.25 {
do_test where-1.27 {
count {SELECT w FROM t1 WHERE x=3 AND y+1==122}
} {10 17}
} {10 10}
do_test where-1.28 {
count {SELECT w FROM t1 WHERE x+1=4 AND y+1==122}
@@ -358,7 +358,7 @@ ifcapable subquery {
count {
SELECT * FROM t1 WHERE rowid+0 IN (1,2,3,1234) order by 1;
}
} {1 0 4 2 1 9 3 1 16 199}
} {1 0 4 2 1 9 3 1 16 102}
do_test where-5.3 {
count {
SELECT * FROM t1 WHERE w IN (-1,1,2,3) order by 1;
@@ -368,7 +368,7 @@ ifcapable subquery {
count {
SELECT * FROM t1 WHERE w+0 IN (-1,1,2,3) order by 1;
}
} {1 0 4 2 1 9 3 1 16 199}
} {1 0 4 2 1 9 3 1 16 102}
do_test where-5.5 {
count {
SELECT * FROM t1 WHERE rowid IN
@@ -382,7 +382,7 @@ ifcapable subquery {
(select rowid from t1 where rowid IN (-1,2,4))
ORDER BY 1;
}
} {2 1 9 4 2 25 201}
} {2 1 9 4 2 25 103}
do_test where-5.7 {
count {
SELECT * FROM t1 WHERE w IN
@@ -396,7 +396,7 @@ ifcapable subquery {
(select rowid from t1 where rowid IN (-1,2,4))
ORDER BY 1;
}
} {2 1 9 4 2 25 201}
} {2 1 9 4 2 25 103}
do_test where-5.9 {
count {
SELECT * FROM t1 WHERE x IN (1,7) ORDER BY 1;