108 lines
2.9 KiB
Plaintext
108 lines
2.9 KiB
Plaintext
# 2014-10-04
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library.
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# This file implements tests for the ANALYZE command.
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set ::testprefix analyzeD
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ifcapable {!stat4} {
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finish_test
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return
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}
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# Set up a table with the following properties:
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#
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# * Contains 1000 rows.
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# * Column a contains even integers between 0 and 18, inclusive (so that
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# a=? for any such integer matches 100 rows).
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# * Column b contains integers between 0 and 9, inclusive.
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# * Column c contains integers between 0 and 199, inclusive (so that
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# for any such integer, c=? matches 5 rows).
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# * Then add 7 rows with a new value for "a" - 3001. The stat4 table will
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# not contain any samples with a=3001.
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#
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do_execsql_test 1.0 {
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CREATE TABLE t1(a, b, c);
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}
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do_test 1.1 {
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for {set i 1} {$i < 1000} {incr i} {
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set c [expr $i % 200]
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execsql { INSERT INTO t1(a, b, c) VALUES( 2*($i/100), $i%10, $c ) }
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}
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execsql {
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INSERT INTO t1 VALUES(3001, 3001, 3001);
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INSERT INTO t1 VALUES(3001, 3001, 3002);
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INSERT INTO t1 VALUES(3001, 3001, 3003);
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INSERT INTO t1 VALUES(3001, 3001, 3004);
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INSERT INTO t1 VALUES(3001, 3001, 3005);
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INSERT INTO t1 VALUES(3001, 3001, 3006);
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INSERT INTO t1 VALUES(3001, 3001, 3007);
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CREATE INDEX t1_ab ON t1(a, b);
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CREATE INDEX t1_c ON t1(c);
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ANALYZE;
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}
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} {}
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# With full ANALYZE data, SQLite sees that c=150 (5 rows) is better than
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# a=3001 (7 rows).
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#
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do_eqp_test 1.2 {
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SELECT * FROM t1 WHERE a=3001 AND c=150;
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} {SEARCH t1 USING INDEX t1_c (c=?)}
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do_test 1.3 {
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execsql { DELETE FROM sqlite_stat1 }
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db close
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sqlite3 db test.db
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} {}
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# Without stat1, because 3001 is larger than all samples in the stat4
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# table, SQLite thinks that a=3001 matches just 1 row. So it (incorrectly)
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# chooses it over the c=150 index (5 rows). Even with stat1 data, things
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# worked this way before commit [e6f7f97dbc].
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#
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do_eqp_test 1.4 {
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SELECT * FROM t1 WHERE a=3001 AND c=150;
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} {SEARCH t1 USING INDEX t1_ab (a=?)}
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do_test 1.5 {
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execsql {
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UPDATE t1 SET a=13 WHERE a = 3001;
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ANALYZE;
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}
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} {}
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do_eqp_test 1.6 {
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SELECT * FROM t1 WHERE a=13 AND c=150;
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} {SEARCH t1 USING INDEX t1_c (c=?)}
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do_test 1.7 {
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execsql { DELETE FROM sqlite_stat1 }
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db close
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sqlite3 db test.db
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} {}
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# Same test as 1.4, except this time the 7 rows that match the a=? condition
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# do not feature larger values than all rows in the stat4 table. So SQLite
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# gets this right, even without stat1 data.
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do_eqp_test 1.8 {
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SELECT * FROM t1 WHERE a=13 AND c=150;
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} {SEARCH t1 USING INDEX t1_c (c=?)}
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finish_test
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