mirror of
https://gitlab.com/cznic/sqlite.git
synced 2024-11-24 02:26:14 +00:00
108 lines
2.9 KiB
Plaintext
108 lines
2.9 KiB
Plaintext
# 2014-10-04
|
|
#
|
|
# 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.
|
|
#
|
|
#***********************************************************************
|
|
# This file implements regression tests for SQLite library.
|
|
# This file implements tests for the ANALYZE command.
|
|
#
|
|
|
|
set testdir [file dirname $argv0]
|
|
source $testdir/tester.tcl
|
|
set ::testprefix analyzeD
|
|
|
|
ifcapable {!stat4} {
|
|
finish_test
|
|
return
|
|
}
|
|
|
|
|
|
# Set up a table with the following properties:
|
|
#
|
|
# * Contains 1000 rows.
|
|
# * Column a contains even integers between 0 and 18, inclusive (so that
|
|
# a=? for any such integer matches 100 rows).
|
|
# * Column b contains integers between 0 and 9, inclusive.
|
|
# * Column c contains integers between 0 and 199, inclusive (so that
|
|
# for any such integer, c=? matches 5 rows).
|
|
# * Then add 7 rows with a new value for "a" - 3001. The stat4 table will
|
|
# not contain any samples with a=3001.
|
|
#
|
|
do_execsql_test 1.0 {
|
|
CREATE TABLE t1(a, b, c);
|
|
}
|
|
do_test 1.1 {
|
|
for {set i 1} {$i < 1000} {incr i} {
|
|
set c [expr $i % 200]
|
|
execsql { INSERT INTO t1(a, b, c) VALUES( 2*($i/100), $i%10, $c ) }
|
|
}
|
|
|
|
execsql {
|
|
INSERT INTO t1 VALUES(3001, 3001, 3001);
|
|
INSERT INTO t1 VALUES(3001, 3001, 3002);
|
|
INSERT INTO t1 VALUES(3001, 3001, 3003);
|
|
INSERT INTO t1 VALUES(3001, 3001, 3004);
|
|
INSERT INTO t1 VALUES(3001, 3001, 3005);
|
|
INSERT INTO t1 VALUES(3001, 3001, 3006);
|
|
INSERT INTO t1 VALUES(3001, 3001, 3007);
|
|
|
|
CREATE INDEX t1_ab ON t1(a, b);
|
|
CREATE INDEX t1_c ON t1(c);
|
|
|
|
ANALYZE;
|
|
}
|
|
} {}
|
|
|
|
# With full ANALYZE data, SQLite sees that c=150 (5 rows) is better than
|
|
# a=3001 (7 rows).
|
|
#
|
|
do_eqp_test 1.2 {
|
|
SELECT * FROM t1 WHERE a=3001 AND c=150;
|
|
} {SEARCH t1 USING INDEX t1_c (c=?)}
|
|
|
|
do_test 1.3 {
|
|
execsql { DELETE FROM sqlite_stat1 }
|
|
db close
|
|
sqlite3 db test.db
|
|
} {}
|
|
|
|
# Without stat1, because 3001 is larger than all samples in the stat4
|
|
# table, SQLite thinks that a=3001 matches just 1 row. So it (incorrectly)
|
|
# chooses it over the c=150 index (5 rows). Even with stat1 data, things
|
|
# worked this way before commit [e6f7f97dbc].
|
|
#
|
|
do_eqp_test 1.4 {
|
|
SELECT * FROM t1 WHERE a=3001 AND c=150;
|
|
} {SEARCH t1 USING INDEX t1_ab (a=?)}
|
|
|
|
do_test 1.5 {
|
|
execsql {
|
|
UPDATE t1 SET a=13 WHERE a = 3001;
|
|
ANALYZE;
|
|
}
|
|
} {}
|
|
|
|
do_eqp_test 1.6 {
|
|
SELECT * FROM t1 WHERE a=13 AND c=150;
|
|
} {SEARCH t1 USING INDEX t1_c (c=?)}
|
|
|
|
do_test 1.7 {
|
|
execsql { DELETE FROM sqlite_stat1 }
|
|
db close
|
|
sqlite3 db test.db
|
|
} {}
|
|
|
|
# Same test as 1.4, except this time the 7 rows that match the a=? condition
|
|
# do not feature larger values than all rows in the stat4 table. So SQLite
|
|
# gets this right, even without stat1 data.
|
|
do_eqp_test 1.8 {
|
|
SELECT * FROM t1 WHERE a=13 AND c=150;
|
|
} {SEARCH t1 USING INDEX t1_c (c=?)}
|
|
|
|
finish_test
|