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sqlite3

    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 1.1.1.1 2012/02/21 17:04:16 misho 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