# 2006 January 02

 #

 # 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 script is descending indices.

 #

 # $Id: descidx3.test,v 1.6 2008/03/19 00:21:31 drh Exp $

 #

 set testdir [file dirname $argv0]

 source $testdir/tester.tcl

 ifcapable !bloblit {

   finish_test

   return

 }

 db eval {PRAGMA legacy_file_format=OFF}

 # This procedure sets the value of the file-format in file 'test.db'

 # to $newval. Also, the schema cookie is incremented.

 # 

 proc set_file_format {newval} {

   hexio_write test.db 44 [hexio_render_int32 $newval]

   set schemacookie [hexio_get_int [hexio_read test.db 40 4]]

   incr schemacookie

   hexio_write test.db 40 [hexio_render_int32 $schemacookie]

   return {}

 }

 # This procedure returns the value of the file-format in file 'test.db'.

 # 

 proc get_file_format {{fname test.db}} {

   return [hexio_get_int [hexio_read $fname 44 4]]

 }

 # Verify that the file format starts as 4.

 #

 do_test descidx3-1.1 {

   execsql {

     CREATE TABLE t1(i INTEGER PRIMARY KEY,a,b,c,d);

     CREATE INDEX t1i1 ON t1(a DESC, b ASC, c DESC);

     CREATE INDEX t1i2 ON t1(b DESC, c ASC, d DESC);

   }

   get_file_format

 } {4}

 # Put some information in the table and verify that the descending

 # index actually works.

 #

 do_test descidx3-2.1 {

   execsql {

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

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

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

     INSERT INTO t1 VALUES(4, 2.5, 2.5, 2.5, 2.5);

     INSERT INTO t1 VALUES(5, -5, -5, -5, -5);

     INSERT INTO t1 VALUES(6, 'six', 'six', 'six', 'six');

     INSERT INTO t1 VALUES(7, x'77', x'77', x'77', x'77');

     INSERT INTO t1 VALUES(8, 'eight', 'eight', 'eight', 'eight');

     INSERT INTO t1 VALUES(9, x'7979', x'7979', x'7979', x'7979');

     SELECT count(*) FROM t1;

   }

 } 9

 do_test descidx3-2.2 {

   execsql {

     SELECT i FROM t1 ORDER BY a;

   }

 } {1 5 2 4 3 8 6 7 9}

 do_test descidx3-2.3 {

   execsql {

     SELECT i FROM t1 ORDER BY a DESC;

   }

 } {9 7 6 8 3 4 2 5 1}

 # The "natural" order for the index is decreasing

 do_test descidx3-2.4 {

   execsql {

     SELECT i FROM t1 WHERE a<=x'7979';

   }

 } {9 7 6 8 3 4 2 5}

 do_test descidx3-2.5 {

   execsql {

     SELECT i FROM t1 WHERE a>-99;

   }

 } {9 7 6 8 3 4 2 5}

 # Even when all values of t1.a are the same, sorting by A returns

 # the rows in reverse order because this the natural order of the

 # index.

 #

 do_test descidx3-3.1 {

   execsql {

     UPDATE t1 SET a=1;

     SELECT i FROM t1 ORDER BY a;

   }

 } {9 7 6 8 3 4 2 5 1}

 do_test descidx3-3.2 {

   execsql {

     SELECT i FROM t1 WHERE a=1 AND b>0 AND b<'zzz'

   }

 } {2 4 3 8 6}

 do_test descidx3-3.3 {

   execsql {

     SELECT i FROM t1 WHERE b>0 AND b<'zzz'

   }

 } {6 8 3 4 2}

 do_test descidx3-3.4 {

   execsql {

     SELECT i FROM t1 WHERE a=1 AND b>-9999 AND b<x'ffffffff'

   }

 } {5 2 4 3 8 6 7 9}

 do_test descidx3-3.5 {

   execsql {

     SELECT i FROM t1 WHERE b>-9999 AND b<x'ffffffff'

   }

 } {9 7 6 8 3 4 2 5}

 ifcapable subquery {

   # If the subquery capability is not compiled in to the binary, then

   # the IN(...) operator is not available. Hence these tests cannot be 

   # run.

   do_test descidx3-4.1 {

     execsql {

       UPDATE t1 SET a=2 WHERE i<6;

       SELECT i FROM t1 WHERE a IN (1,2) AND b>0 AND b<'zzz';

     }

   } {8 6 2 4 3}

   do_test descidx3-4.2 {

     execsql {

       UPDATE t1 SET a=1;

       SELECT i FROM t1 WHERE a IN (1,2) AND b>0 AND b<'zzz';

     }

   } {2 4 3 8 6}

   do_test descidx3-4.3 {

     execsql {

       UPDATE t1 SET b=2;

       SELECT i FROM t1 WHERE a IN (1,2) AND b>0 AND b<'zzz';

     }

   } {9 7 6 8 3 4 2 5 1}

 }

 finish_test