| Index: third_party/sqlite/test/tkt3757.test
|
| ===================================================================
|
| --- third_party/sqlite/test/tkt3757.test (revision 56608)
|
| +++ third_party/sqlite/test/tkt3757.test (working copy)
|
| @@ -1,60 +0,0 @@
|
| -# 2009 March 28
|
| -#
|
| -# The author disclaims copyright to this source code. In place of
|
| -# a legal notice, here is a blessing:
|
| -#
|
| -# May you do good and not evil.
|
| -# May you find forgiveness for yourself and forgive others.
|
| -# May you share freely, never taking more than you give.
|
| -#
|
| -#***********************************************************************
|
| -#
|
| -# Ticket #3757: The cost functions on the query optimizer for the
|
| -# IN operator can be improved.
|
| -#
|
| -# $Id: tkt3757.test,v 1.1 2009/03/29 00:13:04 drh Exp $
|
| -
|
| -set testdir [file dirname $argv0]
|
| -source $testdir/tester.tcl
|
| -
|
| -# Evaluate SQL. Return the result set followed by the
|
| -# and the number of full-scan steps.
|
| -#
|
| -proc count_steps {sql} {
|
| - set r [db eval $sql]
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| - lappend r scan [db status step] sort [db status sort]
|
| -}
|
| -
|
| -# Construct tables
|
| -#
|
| -do_test tkt3757-1.1 {
|
| - db eval {
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| - CREATE TABLE t1(x INTEGER, y INTEGER, z TEXT);
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| - CREATE INDEX t1i1 ON t1(y,z);
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| - INSERT INTO t1 VALUES(1,2,'three');
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| - CREATE TABLE t2(a INTEGER, b TEXT);
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| - INSERT INTO t2 VALUES(2, 'two');
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| - ANALYZE;
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| - SELECT * FROM sqlite_stat1;
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| - }
|
| -} {t1 t1i1 {1 1 1}}
|
| -
|
| -# Modify statistics in order to make the optimizer then that:
|
| -#
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| -# (1) Table T1 has about 250K entries
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| -# (2) There are only about 5 distinct values of T1.
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| -#
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| -# Then run a query with "t1.y IN (SELECT ..)" in the WHERE clause.
|
| -# Make sure the index is used.
|
| -#
|
| -do_test tkt3757-1.2 {
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| - db eval {
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| - DELETE FROM sqlite_stat1;
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| - INSERT INTO sqlite_stat1 VALUES('t1','t1i1','250000 50000 30');
|
| - }
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| - count_steps {
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| - SELECT * FROM t1 WHERE y IN (SELECT a FROM t2)
|
| - }
|
| -} {1 2 three scan 0 sort 0}
|
| -
|
| -finish_test
|
|
|