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+# 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
+
+# Do not use a codec for tests in this file, as the database file is
+# manipulated directly using tcl scripts (using the [hexio_write] command).
+#
+do_not_use_codec
+
+ifcapable !bloblit {
+ finish_test
+ return
+}
+#db eval {PRAGMA legacy_file_format=OFF}
+sqlite3_db_config db LEGACY_FILE_FORMAT 0
+
+# 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 {
+ lsort [execsql {
+ UPDATE t1 SET a=2 WHERE i<6;
+ SELECT i FROM t1 WHERE a IN (1,2) AND b>0 AND b<'zzz';
+ }]
+ } {2 3 4 6 8}
+ 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