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Where possible, transform the DISTINCT qualifier to a GROUP BY clause. GROUP BY clauses may be optimized by indices, DISTINCT qualifiers cannot. (CVS 4538)

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FossilOrigin-Name: e56331234791cf3d830a30e4cfa66682bdf2eed1
This commit is contained in:
danielk1977
2007-11-12 15:29:18 +00:00
parent 390025053e
commit 3c4809a201
6 changed files with 42 additions and 21 deletions
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8
test/collate5.test
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@ -14,7 +14,7 @@
# SELECT statements that use user-defined collation sequences. Also
# GROUP BY clauses that use user-defined collation sequences.
#
# $Id: collate5.test,v 1.5 2005/09/07 22:48:16 drh Exp $
# $Id: collate5.test,v 1.6 2007/11/12 15:29:19 danielk1977 Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@ -57,17 +57,17 @@ do_test collate5-1.1 {
execsql {
SELECT DISTINCT a FROM collate5t1;
}
} {a b n}
} {A B N}
do_test collate5-1.2 {
execsql {
SELECT DISTINCT b FROM collate5t1;
}
} {apple Apple banana {}}
} {{} Apple apple banana}
do_test collate5-1.3 {
execsql {
SELECT DISTINCT a, b FROM collate5t1;
}
} {a apple A Apple b banana n {}}
} {A Apple a apple B banana N {}}
# The remainder of this file tests compound SELECT statements.
# Omit it if the library is compiled such that they are omitted.