# 2006 October 27

 #

 # 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 use of indices in WHERE clauses.

 # This file was created when support for optimizing IS NULL phrases

 # was added.  And so the principle purpose of this file is to test

 # that IS NULL phrases are correctly optimized.  But you can never

 # have too many tests, so some other tests are thrown in as well.

 #

 # $Id: where4.test,v 1.6 2007/12/10 05:03:48 danielk1977 Exp $

 set testdir [file dirname $argv0]

 source $testdir/tester.tcl

 ifcapable !tclvar||!bloblit {

   finish_test

   return

 }

 # Build some test data

 #

 do_test where4-1.0 {

   execsql {

     CREATE TABLE t1(w, x, y);

     CREATE INDEX i1wxy ON t1(w,x,y);

     INSERT INTO t1 VALUES(1,2,3);

     INSERT INTO t1 VALUES(1,NULL,3);

     INSERT INTO t1 VALUES('a','b','c');

     INSERT INTO t1 VALUES('a',NULL,'c');

     INSERT INTO t1 VALUES(X'78',x'79',x'7a');

     INSERT INTO t1 VALUES(X'78',NULL,X'7A');

     INSERT INTO t1 VALUES(NULL,NULL,NULL);

     SELECT count(*) FROM t1;

   }

 } {7}

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

 #

 proc count sql {

   set ::sqlite_search_count 0

   return [concat [execsql $sql] $::sqlite_search_count]

 }

 # Verify that queries use an index.  We are using the special variable

 # "sqlite_search_count" which tallys the number of executions of MoveTo

 # and Next operators in the VDBE.  By verifing that the search count is

 # small we can be assured that indices are being used properly.

 #

 do_test where4-1.1 {

   count {SELECT rowid FROM t1 WHERE w IS NULL}

 } {7 2}

 do_test where4-1.2 {

   count {SELECT rowid FROM t1 WHERE +w IS NULL}

 } {7 6}

 do_test where4-1.3 {

   count {SELECT rowid FROM t1 WHERE w=1 AND x IS NULL}

 } {2 2}

 do_test where4-1.4 {

   count {SELECT rowid FROM t1 WHERE w=1 AND +x IS NULL}

 } {2 3}

 do_test where4-1.5 {

   count {SELECT rowid FROM t1 WHERE w=1 AND x>0}

 } {1 2}

 do_test where4-1.6 {

   count {SELECT rowid FROM t1 WHERE w=1 AND x<9}

 } {1 3}

 do_test where4-1.7 {

   count {SELECT rowid FROM t1 WHERE w=1 AND x IS NULL AND y=3}

 } {2 2}

 do_test where4-1.8 {

   count {SELECT rowid FROM t1 WHERE w=1 AND x IS NULL AND y>2}

 } {2 2}

 do_test where4-1.9 {

   count {SELECT rowid FROM t1 WHERE w='a' AND x IS NULL AND y='c'}

 } {4 2}

 do_test where4-1.10 {

   count {SELECT rowid FROM t1 WHERE w=x'78' AND x IS NULL}

 } {6 2}

 do_test where4-1.11 {

   count {SELECT rowid FROM t1 WHERE w=x'78' AND x IS NULL AND y=123}

 } {1}

 do_test where4-1.12 {

   count {SELECT rowid FROM t1 WHERE w=x'78' AND x IS NULL AND y=x'7A'}

 } {6 2}

 do_test where4-1.13 {

   count {SELECT rowid FROM t1 WHERE w IS NULL AND x IS NULL}

 } {7 2}

 do_test where4-1.14 {

   count {SELECT rowid FROM t1 WHERE w IS NULL AND x IS NULL AND y IS NULL}

 } {7 2}

 do_test where4-1.15 {

   count {SELECT rowid FROM t1 WHERE w IS NULL AND x IS NULL AND y<0}

 } {2}

 do_test where4-1.16 {

   count {SELECT rowid FROM t1 WHERE w IS NULL AND x IS NULL AND y>=0}

 } {1}

 do_test where4-2.1 {

   execsql {SELECT rowid FROM t1 ORDER BY w, x, y}

 } {7 2 1 4 3 6 5}

 do_test where4-2.2 {

   execsql {SELECT rowid FROM t1 ORDER BY w DESC, x, y}

 } {6 5 4 3 2 1 7}

 do_test where4-2.3 {

   execsql {SELECT rowid FROM t1 ORDER BY w, x DESC, y}

 } {7 1 2 3 4 5 6}

 # Ticket #2177

 #

 # Suppose you have a left join where the right table of the left

 # join (the one that can be NULL) has an index on two columns.

 # The first indexed column is used in the ON clause of the join.

 # The second indexed column is used in the WHERE clause with an IS NULL

 # constraint.  It is not allowed to use the IS NULL optimization to

 # optimize the query because the second column might be NULL because

 # the right table did not match - something the index does not know

 # about.

 #

 do_test where4-3.1 {

   execsql {

     CREATE TABLE t2(a);

     INSERT INTO t2 VALUES(1);

     INSERT INTO t2 VALUES(2);

     INSERT INTO t2 VALUES(3);

     CREATE TABLE t3(x,y,UNIQUE(x,y));

     INSERT INTO t3 VALUES(1,11);

     INSERT INTO t3 VALUES(2,NULL);

     SELECT * FROM t2 LEFT JOIN t3 ON a=x WHERE +y IS NULL;

   }

 } {2 2 {} 3 {} {}}

 do_test where4-3.2 {

   execsql {

     SELECT * FROM t2 LEFT JOIN t3 ON a=x WHERE y IS NULL;

   }

 } {2 2 {} 3 {} {}}

 # Ticket #2189.  Probably the same bug as #2177.

 #

 do_test where4-4.1 {

   execsql {

     CREATE TABLE test(col1 TEXT PRIMARY KEY);

     INSERT INTO test(col1) values('a');

     INSERT INTO test(col1) values('b');

     INSERT INTO test(col1) values('c');

     CREATE TABLE test2(col1 TEXT PRIMARY KEY);

     INSERT INTO test2(col1) values('a');

     INSERT INTO test2(col1) values('b');

     INSERT INTO test2(col1) values('c');

     SELECT * FROM test t1 LEFT OUTER JOIN test2 t2 ON t1.col1 = t2.col1

       WHERE +t2.col1 IS NULL;

   }

 } {}

 do_test where4-4.2 {

   execsql {

     SELECT * FROM test t1 LEFT OUTER JOIN test2 t2 ON t1.col1 = t2.col1

       WHERE t2.col1 IS NULL;

   }

 } {}

 do_test where4-4.3 {

   execsql {

     SELECT * FROM test t1 LEFT OUTER JOIN test2 t2 ON t1.col1 = t2.col1

       WHERE +t1.col1 IS NULL;

   }

 } {}

 do_test where4-4.4 {

   execsql {

     SELECT * FROM test t1 LEFT OUTER JOIN test2 t2 ON t1.col1 = t2.col1

       WHERE t1.col1 IS NULL;

   }

 } {}

 # Ticket #2273.  Problems with IN operators and NULLs.

 #

 ifcapable subquery {

 do_test where4-5.1 {

   execsql {

     CREATE TABLE t4(x,y,z,PRIMARY KEY(x,y));

   }

   execsql {

     SELECT *

       FROM t2 LEFT JOIN t4 b1

               LEFT JOIN t4 b2 ON b2.x=b1.x AND b2.y IN (b1.y);

   }

 } {1 {} {} {} {} {} {} 2 {} {} {} {} {} {} 3 {} {} {} {} {} {}}

 do_test where4-5.2 {

   execsql {

     INSERT INTO t4 VALUES(1,1,11);

     INSERT INTO t4 VALUES(1,2,12);

     INSERT INTO t4 VALUES(1,3,13);

     INSERT INTO t4 VALUES(2,2,22);

     SELECT rowid FROM t4 WHERE x IN (1,9,2,5) AND y IN (1,3,NULL,2) AND z!=13;

   }

 } {1 2 4}

 do_test where4-5.3 {

   execsql {

     SELECT rowid FROM t4 WHERE x IN (1,9,NULL,2) AND y IN (1,3,2) AND z!=13;

   }

 } {1 2 4}

 do_test where4-6.1 {

   execsql {

     CREATE TABLE t5(a,b,c,d,e,f,UNIQUE(a,b,c,d,e,f));

     INSERT INTO t5 VALUES(1,1,1,1,1,11111);

     INSERT INTO t5 VALUES(2,2,2,2,2,22222);

     INSERT INTO t5 VALUES(1,2,3,4,5,12345);

     INSERT INTO t5 VALUES(2,3,4,5,6,23456);

   }

   execsql {

     SELECT rowid FROM t5

      WHERE a IN (1,9,2) AND b=2 AND c IN (1,2,3,4) AND d>0

   }

 } {3 2}

 do_test where4-6.2 {

   execsql {

     SELECT rowid FROM t5

      WHERE a IN (1,NULL,2) AND b=2 AND c IN (1,2,3,4) AND d>0

   }

 } {3 2}

 do_test where4-7.1 {

   execsql {

     CREATE TABLE t6(y,z,PRIMARY KEY(y,z));

   }

   execsql {

     SELECT * FROM t6 WHERE y=NULL AND z IN ('hello');

   }

 } {}

 integrity_check {where4-99.0}

 do_test where4-7.1 {

   execsql {

     BEGIN;

     CREATE TABLE t8(a, b, c, d);

     CREATE INDEX t8_i ON t8(a, b, c);

     CREATE TABLE t7(i);

     INSERT INTO t7 VALUES(1);

     INSERT INTO t7 SELECT i*2 FROM t7;

     INSERT INTO t7 SELECT i*2 FROM t7;

     INSERT INTO t7 SELECT i*2 FROM t7;

     INSERT INTO t7 SELECT i*2 FROM t7;

     INSERT INTO t7 SELECT i*2 FROM t7;

     INSERT INTO t7 SELECT i*2 FROM t7;

     COMMIT;

   }

 } {}

 # At one point the sub-select inside the aggregate sum() function in the

 # following query was leaking a couple of stack entries. This query 

 # runs the SELECT in a loop enough times that an assert() fails. Or rather,

 # did fail before the bug was fixed.

 #

 do_test where4-7.2 {

   execsql {

     SELECT sum((

       SELECT d FROM t8 WHERE a = i AND b = i AND c < NULL

     )) FROM t7;

   }

 } {{}}

 }; #ifcapable subquery

 finish_test