mirror of
https://github.com/tursodatabase/libsql.git
synced 2024-11-23 13:16:16 +00:00
61 lines
1.6 KiB
Plaintext
61 lines
1.6 KiB
Plaintext
# 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]
|
|
lappend r scan [db status step] sort [db status sort]
|
|
}
|
|
|
|
# Construct tables
|
|
#
|
|
do_test tkt3757-1.1 {
|
|
db eval {
|
|
CREATE TABLE t1(x INTEGER, y INTEGER, z TEXT);
|
|
CREATE INDEX t1i1 ON t1(y,z);
|
|
INSERT INTO t1 VALUES(1,2,'three');
|
|
CREATE TABLE t2(a INTEGER, b TEXT);
|
|
INSERT INTO t2 VALUES(2, 'two');
|
|
ANALYZE;
|
|
SELECT * FROM sqlite_stat1 ORDER BY 1, 2;
|
|
}
|
|
} {t1 t1i1 {1 1 1} t2 {} 1}
|
|
|
|
# Modify statistics in order to make the optimizer then that:
|
|
#
|
|
# (1) Table T1 has about 250K entries
|
|
# (2) There are only about 5 distinct values of T1.
|
|
#
|
|
# Then run a query with "t1.y IN (SELECT ..)" in the WHERE clause.
|
|
# Make sure the index is used.
|
|
#
|
|
do_test tkt3757-1.2 {
|
|
db eval {
|
|
DELETE FROM sqlite_stat1;
|
|
INSERT INTO sqlite_stat1 VALUES('t1','t1i1','250000 50000 30');
|
|
}
|
|
count_steps {
|
|
SELECT * FROM t1 WHERE y IN (SELECT a FROM t2)
|
|
}
|
|
} {1 2 three scan 0 sort 0}
|
|
|
|
finish_test
|