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 1.402 2009/06/07 23:45:11 drh Exp $
*/
#include "sqliteInt.h"

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

  }
  pLeft = pList->a[1].pExpr;
  if( pLeft->op!=TK_COLUMN ){
    return 0;
  }
  pColl = sqlite3ExprCollSeq(pParse, pLeft);
  assert( pColl!=0 || pLeft->iColumn==-1 );
  if( pColl==0 ) return 0;



  if( (pColl->type!=SQLITE_COLL_BINARY || *pnoCase) &&
      (pColl->type!=SQLITE_COLL_NOCASE || !*pnoCase) ){
    return 0;
  }
  if( sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT ) return 0;
  z = pRight->u.zToken;
  cnt = 0;
  if( ALWAYS(z) ){
    while( (c=z[cnt])!=0 && c!=wc[0] && c!=wc[1] && c!=wc[2] ){
      cnt++;
    }
  }
  if( cnt==0 || c==0 || 255==(u8)z[cnt-1] ){
    return 0;
  }

#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the LIKE and GLOB operators and
# in particular the optimizations that occur to help those operators
# run faster.
#
# $Id: like.test,v 1.13 2009/06/07 23:45:11 drh Exp $

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

# Create some sample data to work with.
#
do_test like-1.0 {

  }
} {ABC {ABC abc xyz} abc abcd nosort {} i1}
do_test like-5.2 {
  set sqlite_like_count
} 12
do_test like-5.3 {
  execsql {
    CREATE TABLE t2(x TEXT COLLATE NOCASE);
    INSERT INTO t2 SELECT * FROM t1;
    CREATE INDEX i2 ON t2(x COLLATE NOCASE);
  }
  set sqlite_like_count 0
  queryplan {
    SELECT x FROM t2 WHERE x LIKE 'abc%' ORDER BY 1
  }

  queryplan {
    SELECT x FROM t2 WHERE x LIKE 'ZZ%';
  }
} {zz-lower-lower zZ-lower-upper Zz-upper-lower ZZ-upper-upper nosort {} i2}
do_test like-5.25 {
  queryplan {
    PRAGMA case_sensitive_like=on;
    CREATE TABLE t3(x TEXT);
    CREATE INDEX i3 ON t3(x);
    INSERT INTO t3 VALUES('ZZ-upper-upper');
    INSERT INTO t3 VALUES('zZ-lower-upper');
    INSERT INTO t3 VALUES('Zz-upper-lower');
    INSERT INTO t3 VALUES('zz-lower-lower');
    SELECT x FROM t3 WHERE x LIKE 'zz%';
  }

  execsql {
    SELECT * FROM t2 WHERE x LIKE '''a%'
  }
} {'abc 'ax}

do_test like-7.1 {
  execsql {
    SELECT rowid, * FROM t1 WHERE rowid GLOB '1*' ORDER BY rowid;
  }
} {1 a 10 ABC 11 CDE 12 {ABC abc xyz}}

# ticket #3345.
#
# Overloading the LIKE function with -1 for the number of arguments
# will overload both the 2-argument and the 3-argument LIKE.
#
do_test like-8.1 {

      set res [sqlite3_exec_hex db {
         EXPLAIN QUERY PLAN SELECT x FROM t2 WHERE x LIKE '%fe%25'
      }]
      regexp {INDEX i2} $res
    } {1}
  }
}

# Do an SQL statement.  Append the search count to the end of the result.
#
proc count sql {
  set ::sqlite_search_count 0
  set ::sqlite_like_count 0
  return [concat [execsql $sql] scan $::sqlite_search_count \
           like $::sqlite_like_count]
}

# The LIKE and GLOB optimizations do not work on columns with
# affinity other than TEXT.
# Ticket #3901
#
do_test like-10.1 {
  db close
  sqlite3 db test.db
  execsql {
    CREATE TABLE t10(
      a INTEGER PRIMARY KEY,
      b INTEGER COLLATE nocase UNIQUE,
      c NUMBER COLLATE nocase UNIQUE,
      d BLOB COLLATE nocase UNIQUE,
      e COLLATE nocase UNIQUE,
      f TEXT COLLATE nocase UNIQUE
    );
    INSERT INTO t10 VALUES(1,1,1,1,1,1);
    INSERT INTO t10 VALUES(12,12,12,12,12,12);
    INSERT INTO t10 VALUES(123,123,123,123,123,123);
    INSERT INTO t10 VALUES(234,234,234,234,234,234);
    INSERT INTO t10 VALUES(345,345,345,345,345,345);
    INSERT INTO t10 VALUES(45,45,45,45,45,45);
  }
  count {
    SELECT a FROM t10 WHERE b LIKE '12%' ORDER BY a;
  }
} {12 123 scan 5 like 6}
do_test like-10.2 {
  count {
    SELECT a FROM t10 WHERE c LIKE '12%' ORDER BY a;
  }
} {12 123 scan 5 like 6}
do_test like-10.3 {
  count {
    SELECT a FROM t10 WHERE d LIKE '12%' ORDER BY a;
  }
} {12 123 scan 5 like 6}
do_test like-10.4 {
  count {
    SELECT a FROM t10 WHERE e LIKE '12%' ORDER BY a;
  }
} {12 123 scan 5 like 6}
do_test like-10.5 {
  count {
    SELECT a FROM t10 WHERE f LIKE '12%' ORDER BY a;
  }
} {12 123 scan 3 like 0}
do_test like-10.6 {
  count {
    SELECT a FROM t10 WHERE a LIKE '12%' ORDER BY a;
  }
} {12 123 scan 5 like 6}
do_test like-10.10 {
  execsql {
    CREATE TABLE t10b(
      a INTEGER PRIMARY KEY,
      b INTEGER UNIQUE,
      c NUMBER UNIQUE,
      d BLOB UNIQUE,
      e UNIQUE,
      f TEXT UNIQUE
    );
    INSERT INTO t10b SELECT * FROM t10;
  }
  count {
    SELECT a FROM t10b WHERE b GLOB '12*' ORDER BY a;
  }
} {12 123 scan 5 like 6}
do_test like-10.11 {
  count {
    SELECT a FROM t10b WHERE c GLOB '12*' ORDER BY a;
  }
} {12 123 scan 5 like 6}
do_test like-10.12 {
  count {
    SELECT a FROM t10b WHERE d GLOB '12*' ORDER BY a;
  }
} {12 123 scan 5 like 6}
do_test like-10.13 {
  count {
    SELECT a FROM t10b WHERE e GLOB '12*' ORDER BY a;
  }
} {12 123 scan 5 like 6}
do_test like-10.14 {
  count {
    SELECT a FROM t10b WHERE f GLOB '12*' ORDER BY a;
  }
} {12 123 scan 3 like 0}
do_test like-10.15 {
  count {
    SELECT a FROM t10b WHERE a GLOB '12*' ORDER BY a;
  }
} {12 123 scan 5 like 6}


finish_test

# 2008 December 23
#
# 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: where7.test,v 1.9 2009/06/07 23:45:11 drh Exp $

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

ifcapable !or_opt {
  finish_test
  return

  append sql " ORDER BY a"
  count_steps $sql
} {scan 0 sort 1}


do_test where7-2.1 {
  db eval {
    CREATE TABLE t2(a INTEGER PRIMARY KEY,b,c,d,e,f TEXT,g);
    INSERT INTO t2 VALUES(1,11,1001,1.001,100.1,'bcdefghij','yxwvuts');
    INSERT INTO t2 VALUES(2,22,1001,2.002,100.1,'cdefghijk','yxwvuts');
    INSERT INTO t2 VALUES(3,33,1001,3.0029999999999997,100.1,'defghijkl','xwvutsr');
    INSERT INTO t2 VALUES(4,44,2002,4.004,200.2,'efghijklm','xwvutsr');
    INSERT INTO t2 VALUES(5,55,2002,5.004999999999999,200.2,'fghijklmn','xwvutsr');
    INSERT INTO t2 VALUES(6,66,2002,6.005999999999999,200.2,'ghijklmno','xwvutsr');
    INSERT INTO t2 VALUES(7,77,3003,7.007,300.29999999999995,'hijklmnop','xwvutsr');

    INSERT INTO t2 VALUES(100,1100,34034,100.1,3403.3999999999996,'wxyzabcde','edcbazy');
    CREATE INDEX t2b ON t2(b);
    CREATE INDEX t2c ON t2(c);
    CREATE INDEX t2d ON t2(d);
    CREATE INDEX t2e ON t2(e);
    CREATE INDEX t2f ON t2(f);
    CREATE INDEX t2g ON t2(g);
    CREATE TABLE t3(a INTEGER PRIMARY KEY,b,c,d,e,f TEXT,g);
    INSERT INTO t3 SELECT * FROM t2;
    CREATE INDEX t3b ON t3(b,c);
    CREATE INDEX t3c ON t3(c,e);
    CREATE INDEX t3d ON t3(d,g);
    CREATE INDEX t3e ON t3(e,f,g);
    CREATE INDEX t3f ON t3(f,b,d,c);
    CREATE INDEX t3g ON t3(g,f);

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library. The focus
# is testing of where.c. More specifically, the focus is the optimization
# of WHERE clauses that feature the OR operator.
#
# $Id: where8.test,v 1.8 2009/06/07 23:45:11 drh Exp $

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

# Test organization:
#
#   where8-1.*: Tests to demonstrate simple cases work with a single table

  set ::sqlite_search_count 0
  set result [uplevel [list execsql_status $sql $db]]
  concat $result $::sqlite_search_count
}

do_test where8-1.1 {
  execsql {
    CREATE TABLE t1(a, b TEXT, c);
    CREATE INDEX i1 ON t1(a);
    CREATE INDEX i2 ON t1(b);

    INSERT INTO t1 VALUES(1,  'one',   'I');
    INSERT INTO t1 VALUES(2,  'two',   'II');
    INSERT INTO t1 VALUES(3,  'three', 'III');
    INSERT INTO t1 VALUES(4,  'four',  'IV');