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Annotation of embedaddon/sqlite3/test/tkt3757.test, revision 1.1.1.1

1.1       misho       1: # 2009 March 28
                      2: #
                      3: # The author disclaims copyright to this source code.  In place of
                      4: # a legal notice, here is a blessing:
                      5: #
                      6: #    May you do good and not evil.
                      7: #    May you find forgiveness for yourself and forgive others.
                      8: #    May you share freely, never taking more than you give.
                      9: #
                     10: #***********************************************************************
                     11: #
                     12: # Ticket #3757:  The cost functions on the query optimizer for the
                     13: # IN operator can be improved.
                     14: #
                     15: # $Id: tkt3757.test,v 1.1 2009/03/29 00:13:04 drh Exp $
                     16: 
                     17: set testdir [file dirname $argv0]
                     18: source $testdir/tester.tcl
                     19: 
                     20: # Evaluate SQL.  Return the result set followed by the
                     21: # and the number of full-scan steps.
                     22: #
                     23: proc count_steps {sql} {
                     24:   set r [db eval $sql]
                     25:   lappend r scan [db status step] sort [db status sort]
                     26: }
                     27: 
                     28: # Construct tables
                     29: #
                     30: do_test tkt3757-1.1 {
                     31:   db eval {
                     32:      CREATE TABLE t1(x INTEGER, y INTEGER, z TEXT);
                     33:      CREATE INDEX t1i1 ON t1(y,z);
                     34:      INSERT INTO t1 VALUES(1,2,'three');
                     35:      CREATE TABLE t2(a INTEGER, b TEXT);
                     36:      INSERT INTO t2 VALUES(2, 'two');
                     37:      ANALYZE;
                     38:      SELECT * FROM sqlite_stat1 ORDER BY 1, 2;
                     39:   }
                     40: } {t1 t1i1 {1 1 1} t2 {} 1}
                     41: 
                     42: # Modify statistics in order to make the optimizer then that:
                     43: #
                     44: #   (1)  Table T1 has about 250K entries
                     45: #   (2)  There are only about 5 distinct values of T1.
                     46: #
                     47: # Then run a query with "t1.y IN (SELECT ..)" in the WHERE clause.
                     48: # Make sure the index is used.
                     49: #
                     50: do_test tkt3757-1.2 {
                     51:   db eval {
                     52:     DELETE FROM sqlite_stat1;
                     53:     INSERT INTO sqlite_stat1 VALUES('t1','t1i1','250000 50000 30');
                     54:   }
                     55:   count_steps {
                     56:     SELECT * FROM t1 WHERE y IN (SELECT a FROM t2)
                     57:   }
                     58: } {1 2 three scan 0 sort 0}
                     59: 
                     60: finish_test