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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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4
test/insert4.test
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@ -11,7 +11,7 @@
# This file implements regression tests for SQLite library. The
# focus of this file is testing the INSERT transfer optimization.
#
# $Id: insert4.test,v 1.8 2007/10/09 08:29:32 danielk1977 Exp $
# $Id: insert4.test,v 1.9 2007/11/12 15:29:19 danielk1977 Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@ -112,7 +112,7 @@ do_test insert4-2.4.1 {
INSERT INTO t3 SELECT DISTINCT * FROM t2;
SELECT * FROM t3;
}
} {9 1 1 9}
} {1 9 9 1}
xferopt_test insert4-2.4.2 0
do_test insert4-2.4.3 {
catchsql {