SQLite

** This module contains C code that generates VDBE code used to process
** the WHERE clause of SQL statements.  This module is responsible 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 1.360 2009/01/08 03:11:19 drh Exp $
*/
#include "sqliteInt.h"

/*
** Trace output macros
*/
#if defined(SQLITE_TEST) || defined(SQLITE_DEBUG)

      addrCont = 
         sqlite3VdbeAddOp3(v, OP_RowSetRead, regOrRowset,addrBrk,regNextRowid);
      sqlite3VdbeAddOp2(v, OP_Seek, iCur, regNextRowid);
      sqlite3ReleaseTempReg(pParse, regNextRowid);
      /* sqlite3ReleaseTempReg(pParse, regOrRowset); // Preserve the RowSet */
      pLevel->op = OP_Goto;
      pLevel->p2 = addrCont;
    }else{
      pLevel->op = OP_Noop;
    }
    disableTerm(pLevel, pTerm);
  }else
#endif /* SQLITE_OMIT_OR_OPTIMIZATION */

  {
    /* Case 5:  There is no usable index.  We must do a complete

    /* Check that if the table scanned by this loop iteration had an
    ** INDEXED BY clause attached to it, that the named index is being
    ** used for the scan. If not, then query compilation has failed.
    ** Return an error.
    */
    pIdx = pTabList->a[bestJ].pIndex;



    if( pIdx ){
      if( (bestPlan.plan.wsFlags & WHERE_INDEXED)==0 ){


        sqlite3ErrorMsg(pParse, "cannot use index: %s", pIdx->zName);
        goto whereBeginError;
      }else{
        /* If an INDEXED BY clause is used, the bestIndex() function is
        ** guaranteed to find the index specified in the INDEXED BY clause
        ** if it find an index at all. */
        assert( bestPlan.plan.u.pIdx==pIdx );
      }
    }
  }
  WHERETRACE(("*** Optimizer Finished ***\n"));
  if( db->mallocFailed ){
    goto whereBeginError;
  }

# 2008 August 01
#
# 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.
#
#***********************************************************************
#
# This test script checks malloc failures in WHERE clause analysis.
# 
# $Id: mallocK.test,v 1.2 2009/01/08 03:11:19 drh Exp $

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


set sql {SELECT * FROM t1, t2 WHERE (a=1 OR a=2)}
for {set x 1} {$x<5} {incr x} {
  append sql " AND b=y"
  do_malloc_test mallocK-1.$x -sqlbody $sql -sqlprep {
    CREATE TABLE t1(a,b);
    CREATE TABLE t2(x,y);
  }
}

set sql {SELECT * FROM t1 WHERE a GLOB 'xyz*'}
for {set x 1} {$x<5} {incr x} {
  append sql " AND b!=$x"
  do_malloc_test mallocK-2.$x -sqlbody $sql -sqlprep {
    CREATE TABLE t1(a,b);
  }
}

# 2008 December 30
#
# 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.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the multi-index OR clause optimizer.
#
# $Id: where9.test,v 1.4 2009/01/08 03:11:19 drh Exp $

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

ifcapable !or_opt {
  finish_test
  return

         AND (c>=31031 OR d IS NULL)
    }]
    set a [expr {[lsearch $r {TABLE t1 VIA MULTI-INDEX UNION}]>=0}]
    set b [expr {[lsearch $r {TABLE t1 WITH INDEX t1b}]>=0}]
    concat $a $b
  } {0 1}
}

############################################################################
# Make sure OR-clauses work correctly on UPDATE and DELETE statements.

do_test where9-6.2.1 {
  db eval {SELECT count(*) FROM t1 UNION ALL SELECT a FROM t1 WHERE a>=85}
} {99 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99}

do_test where9-6.2.2 {   ;# Deletes entries 90 91 92 96 97 99
  count_steps {
     BEGIN;
     DELETE FROM t1
     WHERE b IS NULL
        OR c IS NULL
        OR d IS NULL
  }
} {scan 0 sort 0}

do_test where9-6.2.3 {
  db eval {
    SELECT count(*) FROM t1 UNION ALL
    SELECT a FROM t1 WHERE a>=85;
    ROLLBACK;
  }
} {93 85 86 87 88 89 93 94 95 98}

do_test where9-6.2.4 {   ;# Deletes entries 90 91 92 96 97 99
  count_steps {
     BEGIN;
     DELETE FROM t1
     WHERE +b IS NULL
        OR c IS NULL
        OR d IS NULL
  }
} {scan 98 sort 0}

do_test where9-6.2.5 {
  db eval {
     SELECT count(*) FROM t1 UNION ALL
     SELECT a FROM t1 WHERE a>=85;
     ROLLBACK;
  }
} {93 85 86 87 88 89 93 94 95 98}

do_test where9-6.2.6 {
  count_steps {
     BEGIN;
     UPDATE t1 SET a=a+100
     WHERE (b IS NULL
            OR c IS NULL
            OR d IS NULL)
       AND a!=92
       AND a!=97
  }
} {scan 0 sort 0}   ;# Add 100 to entries 90 91 96 99

do_test where9-6.2.7 {
  db eval {
     SELECT count(*) FROM t1 UNION ALL
     SELECT a FROM t1 WHERE a>=85;
     ROLLBACK
  }
} {99 85 86 87 88 89 92 93 94 95 97 98 190 191 196 199}

do_test where9-6.2.8 {   ;# Deletes entries 90 91 92 97 99
  count_steps {
     BEGIN;
     DELETE FROM t1
     WHERE (b IS NULL
            OR c IS NULL
            OR d IS NULL)
       AND a!=96
  }
} {scan 0 sort 0}

do_test where9-6.2.9 {
  db eval {
     SELECT count(*) FROM t1 UNION ALL SELECT a FROM t1 WHERE a>=85;
     ROLLBACK;
  }
} {94 85 86 87 88 89 93 94 95 96 98}

do_test where9-6.3.1 {
  count_steps {
    BEGIN;
    DELETE FROM t1
     WHERE (b IS NULL AND c NOT NULL AND d NOT NULL)
        OR (b NOT NULL AND c IS NULL AND d NOT NULL)
        OR (b NOT NULL AND c NOT NULL AND d IS NULL)
  }
} {scan 0 sort 0}   ;# DELETEs rows 90 91 92 97
do_test where9-6.3.2 {
  db eval {
    SELECT count(*) FROM t1 UNION ALL
    SELECT a FROM t1 WHERE a BETWEEN 85 AND 100;
    ROLLBACK;
  }
} {95 85 86 87 88 89 93 94 95 96 98 99}

do_test where9-6.3.3 {
  count_steps {
    BEGIN;
    UPDATE t1 SET a=a+100
     WHERE (b IS NULL AND c NOT NULL AND d NOT NULL)
        OR (b NOT NULL AND c IS NULL AND d NOT NULL)
        OR (b NOT NULL AND c NOT NULL AND d IS NULL)
  }
} {scan 0 sort 0}   ;# Add 100 to rowids 90 91 92 97
do_test where9-6.3.4 {
  db eval {
    SELECT count(*) FROM t1 UNION ALL
    SELECT a FROM t1 WHERE a BETWEEN 85 AND 200;
    ROLLBACK;
  }
} {99 85 86 87 88 89 93 94 95 96 98 99 190 191 192 197}

do_test where9-6.3.5 {
  count_steps {
    BEGIN;
    DELETE FROM t1
     WHERE (+b IS NULL AND c NOT NULL AND d NOT NULL)
        OR (b NOT NULL AND c IS NULL AND d NOT NULL)
        OR (b NOT NULL AND c NOT NULL AND d IS NULL)
  }
} {scan 98 sort 0}   ;# DELETEs rows 90 91 92 97
do_test where9-6.3.6 {
  db eval {
    SELECT count(*) FROM t1 UNION ALL
    SELECT a FROM t1 WHERE a BETWEEN 85 AND 100;
    ROLLBACK;
  }
} {95 85 86 87 88 89 93 94 95 96 98 99}

do_test where9-6.3.7 {
  count_steps {
    BEGIN;
    UPDATE t1 SET a=a+100
     WHERE (b IS NULL AND c NOT NULL AND d NOT NULL)
        OR (b NOT NULL AND +c IS NULL AND d NOT NULL)
        OR (b NOT NULL AND c NOT NULL AND d IS NULL)
  }
} {scan 98 sort 0}   ;# Add 100 to rowids 90 91 92 97
do_test where9-6.3.8 {
  db eval {
    SELECT count(*) FROM t1 UNION ALL
    SELECT a FROM t1 WHERE a BETWEEN 85 AND 100;
    ROLLBACK;
  }
} {99 85 86 87 88 89 93 94 95 96 98 99}


do_test where9-6.4.1 {
  count_steps {
    BEGIN;
    DELETE FROM t1
     WHERE (b>=950 AND b<=1010) OR (b IS NULL AND c NOT NULL)
  }
} {scan 0 sort 0}  ;# DELETE rows 87 88 89 90 91
do_test where9-6.4.2 {
  db eval {
    SELECT count(*) FROM t1 UNION ALL
    SELECT a FROM t1 WHERE a BETWEEN 85 AND 100;
    ROLLBACK;
  }
} {94 85 86 92 93 94 95 96 97 98 99}
do_test where9-6.4.3 {
  count_steps {
    BEGIN;
    UPDATE t1 SET a=a+100
     WHERE (b>=950 AND b<=1010) OR (b IS NULL AND c NOT NULL)
  }
} {scan 0 sort 0}  ;# Add 100 to rowids 87 88 89 90 91
do_test where9-6.4.4 {
  db eval {
    SELECT count(*) FROM t1 UNION ALL
    SELECT a FROM t1 WHERE a BETWEEN 85 AND 100;
    ROLLBACK;
  }
} {99 85 86 92 93 94 95 96 97 98 99}


do_test where9-6.5.1 {
  count_steps {
    BEGIN;
    DELETE FROM t1
     WHERE a=83
        OR b=913
        OR c=28028
        OR (d>=82 AND d<83)
        OR (e>2802 AND e<2803) 
        OR f='fghijklmn'
        OR g='hgfedcb'
  }
} {scan 0 sort 0}   ;#  DELETE rows 5 31 57 82 83 84 85 86 87
do_test where9-6.5.2 {
  db eval {
    SELECT count(*) FROM t1 UNION ALL
    SELECT a FROM t1 WHERE a IN (5,31,57,82,83,84,85,86,87);
    ROLLBACK;
  }
} {90}

do_test where9-6.5.3 {
  count_steps {
    BEGIN;
    UPDATE t1 SET a=a+100
     WHERE a=83
        OR b=913
        OR c=28028
        OR (d>=82 AND d<83)
        OR (e>2802 AND e<2803) 
        OR f='fghijklmn'
        OR g='hgfedcb'
  }
} {scan 0 sort 0}   ;#  Add 100 to rowids 5 31 57 82 83 84 85 86 87
do_test where9-6.5.4 {
  db eval {
    SELECT count(*) FROM t1 UNION ALL
    SELECT a FROM t1 WHERE a%100 IN (5,31,57,82,83,84,85,86,87);
    ROLLBACK;
  }
} {99 105 131 157 182 183 184 185 186 187}


finish_test