SQLite

      n += p->u.i;
    }
    return n>p->db->aLimit[SQLITE_LIMIT_LENGTH];
  }
  return 0; 
}

/*
** Size of struct Mem not including the Mem.zMalloc member.
*/
#define MEMCELLSIZE (int)(&(((Mem *)0)->zMalloc))

/*
** Make an shallow copy of pFrom into pTo.  Prior contents of
** pTo are freed.  The pFrom->z field is not duplicated.  If
** pFrom->z is used, then pTo->z points to the same thing as pFrom->z
** and flags gets srcType (either MEM_Ephem or MEM_Static).

** This module contains C code that generates VDBE code used to process
** the WHERE clause of SQL statements.  This module is reponsible for
** generating the code that loops through a table looking for applicable
** rows.  Indices are selected and used to speed the search when doing
** so is applicable.  Because this module is responsible for selecting
** indices, you might also think of this module as the "query optimizer".
**
** $Id: where.c,v 1.293 2008/03/28 18:11:17 danielk1977 Exp $
*/
#include "sqliteInt.h"

/*
** The number of bits in a Bitmask.  "BMS" means "BitMask Size".
*/
#define BMS  (sizeof(Bitmask)*8)

        testOp = OP_IdxGE;
      }else{
        testOp = nEq>0 ? OP_IdxGE : OP_Noop;
        topEq = 1;
      }
      if( testOp!=OP_Noop || (isMinQuery&&bRev) ){
        int nCol = nEq + topLimit;
        if( isMinQuery && bRev && !topLimit ){
          sqlite3VdbeAddOp2(v, OP_Null, 0, regBase+nCol);
          nCol++;
          topEq = 0;
        }
        buildIndexProbe(v, nCol, pIdx, regBase, pLevel->iMem);
        if( bRev ){
          int op = topEq ? OP_MoveLe : OP_MoveLt;

# 2008 January 5
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# $Id: minmax3.test,v 1.3 2008/03/28 18:11:17 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Do an SQL statement.  Append the search count to the end of the result.
#
proc count sql {

  execsql   { SELECT y from t1}
  count   { SELECT max(y) FROM t1; }
} {VI 0}
do_test minmax3-1.4.4 {
  execsql { DROP INDEX i1 }
} {}

do_test minmax3-2.1 {
  execsql {
    CREATE TABLE t2(a, b);
    CREATE INDEX i3 ON t2(a, b);
    INSERT INTO t2 VALUES(1, NULL);
    INSERT INTO t2 VALUES(1, 1);
    INSERT INTO t2 VALUES(1, 2);
    INSERT INTO t2 VALUES(1, 3);
    INSERT INTO t2 VALUES(2, NULL);
    INSERT INTO t2 VALUES(2, 1);
    INSERT INTO t2 VALUES(2, 2);
    INSERT INTO t2 VALUES(2, 3);
    INSERT INTO t2 VALUES(3, 1);
    INSERT INTO t2 VALUES(3, 2);
    INSERT INTO t2 VALUES(3, 3);
  }
} {}
do_test minmax3-2.2 {
  execsql { SELECT min(b) FROM t2 WHERE a = 1; }
} {1}
do_test minmax3-2.3 {
  execsql { SELECT min(b) FROM t2 WHERE a = 1 AND b>1; }
} {2}
do_test minmax3-2.4 {
  execsql { SELECT min(b) FROM t2 WHERE a = 1 AND b>-1; }
} {1}
do_test minmax3-2.5 {
  execsql { SELECT min(b) FROM t2 WHERE a = 1; }
} {1}
do_test minmax3-2.6 {
  execsql { SELECT min(b) FROM t2 WHERE a = 1 AND b<2; }
} {1}
do_test minmax3-2.7 {
  execsql { SELECT min(b) FROM t2 WHERE a = 1 AND b<1; }
} {{}}
do_test minmax3-2.8 {
  execsql { SELECT min(b) FROM t2 WHERE a = 3 AND b<1; }
} {{}}

finish_test