gitlab.com/CoiaPrant/sqlite3@v1.19.1/testdata/tcl/tkt2643.test (about)

     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 2007/09/13 17:54:41 drh 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