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sqlite3

    1: # 2007 Sep 12
    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: # This file is to test that ticket #2643 has been fixed.
   13: #
   14: # $Id: tkt2643.test,v 1.1.1.1 2012/02/21 17:04:16 misho Exp $
   15: #
   16: 
   17: # The problem in ticket #2643 has to do with the query optimizer
   18: # making bad assumptions about index cost when data from ANALYZE
   19: # is available.
   20: 
   21: set testdir [file dirname $argv0]
   22: source $testdir/tester.tcl
   23: 
   24: do_test tkt2643-1.1 {
   25:   execsql {
   26:     CREATE TABLE t1(a INTEGER PRIMARY KEY, b UNIQUE, c);
   27:     INSERT INTO t1 VALUES(1,2,3);
   28:     INSERT INTO t1 VALUES(2,3,4);
   29:     ANALYZE;
   30:   }
   31:   db close
   32:   sqlite3 db test.db
   33:   execsql {
   34:     CREATE INDEX i1 ON t1(c);
   35:     SELECT count(*) FROM t1 WHERE c IS NOT NULL
   36:   }
   37: } {2}
   38: 
   39: finish_test