# 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