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+# 2009 February 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 reverse_select_order pragma.
+#
+# $Id: whereA.test,v 1.3 2009/06/10 19:33:29 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+do_test whereA-1.1 {
+  db eval {
+    CREATE TABLE t1(a INTEGER PRIMARY KEY, b UNIQUE, c);
+    INSERT INTO t1 VALUES(1,2,3);
+    INSERT INTO t1 values(2,'hello','world');
+    INSERT INTO t1 VALUES(3,4.53,NULL);
+    SELECT * FROM t1
+  }
+} {1 2 3 2 hello world 3 4.53 {}}
+do_test whereA-1.2 {
+  db eval {
+    PRAGMA reverse_unordered_selects=1;
+    SELECT * FROM t1;
+  }
+} {3 4.53 {} 2 hello world 1 2 3}
+
+do_test whereA-1.3 {
+  db close
+  sqlite3 db test.db
+  db eval {
+    PRAGMA reverse_unordered_selects=1;
+    SELECT * FROM t1;
+  }
+} {3 4.53 {} 2 hello world 1 2 3}
+do_test whereA-1.4 {
+  db close
+  sqlite3 db test.db
+  db eval {
+    PRAGMA reverse_unordered_selects=1;
+    SELECT * FROM t1 ORDER BY rowid;
+  }
+} {1 2 3 2 hello world 3 4.53 {}}
+do_test whereA-1.5 {
+  db eval {
+    VACUUM;
+    SELECT * FROM t1 ORDER BY rowid;
+  }
+} {1 2 3 2 hello world 3 4.53 {}}
+do_test whereA-1.6 {
+  db eval {
+    PRAGMA reverse_unordered_selects;
+  }
+} {1}
+do_test whereA-1.7 {
+  db close
+  sqlite3 db test.db
+  db eval {
+    PRAGMA reverse_unordered_selects=1;
+    VACUUM;
+    SELECT * FROM t1;
+  }
+} {3 4.53 {} 2 hello world 1 2 3}
+do_execsql_test whereA-1.8 {
+  SELECT * FROM t1 WHERE b=2 AND a IS NULL;
+} {}
+do_execsql_test whereA-1.9 {
+  SELECT * FROM t1 WHERE b=2 AND a IS NOT NULL;
+} {1 2 3}
+
+do_test whereA-2.1 {
+  db eval {
+    PRAGMA reverse_unordered_selects=0;
+    SELECT * FROM t1 WHERE a>0;
+  }
+} {1 2 3 2 hello world 3 4.53 {}}
+do_test whereA-2.2 {
+  db eval {
+    PRAGMA reverse_unordered_selects=1;
+    SELECT * FROM t1 WHERE a>0;
+  }
+} {3 4.53 {} 2 hello world 1 2 3}
+
+do_test whereA-2.3 {
+  db eval {
+    PRAGMA reverse_unordered_selects=1;
+    SELECT * FROM t1 WHERE a>0 ORDER BY rowid;
+  }
+} {1 2 3 2 hello world 3 4.53 {}}
+
+do_test whereA-3.1 {
+  db eval {
+    PRAGMA reverse_unordered_selects=0;
+    SELECT * FROM t1 WHERE b>0;
+  }
+} {1 2 3 3 4.53 {} 2 hello world}
+do_test whereA-3.2 {
+  db eval {
+    PRAGMA reverse_unordered_selects=1;
+    SELECT * FROM t1 WHERE b>0;
+  }
+} {2 hello world 3 4.53 {} 1 2 3}
+do_test whereA-3.3 {
+  db eval {
+    PRAGMA reverse_unordered_selects=1;
+    SELECT * FROM t1 WHERE b>0 ORDER BY b;
+  }
+} {1 2 3 3 4.53 {} 2 hello world}
+
+do_test whereA-4.1 {
+  db eval {
+    CREATE TABLE t2(x);
+    INSERT INTO t2 VALUES(1);
+    INSERT INTO t2 VALUES(2);
+    SELECT x FROM t2;
+  }
+} {2 1}
+# Do an SQL statement.  Append the search count to the end of the result.
+#
+proc count sql {
+  set ::sqlite_sort_count 0
+  return [concat [execsql $sql] $::sqlite_sort_count]
+}
+do_test whereA-4.2 {   ;# Ticket #3904
+  db eval {
+    CREATE INDEX t2x ON t2(x);
+  }
+  count {
+    SELECT x FROM t2;
+  }
+} {2 1 0}
+do_test whereA-4.3 {
+  count {
+    SELECT x FROM t2 ORDER BY x;
+  }
+} {1 2 0}
+do_test whereA-4.4 {
+  count {
+    SELECT x FROM t2 ORDER BY x DESC;
+  }
+} {2 1 0}
+do_test whereA-4.5 {
+  db eval {DROP INDEX t2x;}
+  count {
+    SELECT x FROM t2 ORDER BY x;
+  }
+} {1 2 1}
+do_test whereA-4.6 {
+  count {
+    SELECT x FROM t2 ORDER BY x DESC;
+  }
+} {2 1 1}
+
+# Ticket https://sqlite.org/src/tktview/cb91bf4290c211  2017-08-01
+# Assertion fault following PRAGMA reverse_unordered_selects=ON.
+# 
+do_execsql_test whereA-5.1 {
+  PRAGMA reverse_unordered_selects=on;
+  DROP TABLE IF EXISTS t1;
+  CREATE TABLE t1(a,b);
+  INSERT INTO t1 VALUES(1,2);
+  CREATE INDEX t1b ON t1(b);
+  SELECT a FROM t1 WHERE b=-99 OR b>1;
+} {1}
+
+# 2020-10-02 OSSFuzz find for an issue introduced by a check-in
+# on the previous day.
+#
+reset_db
+do_execsql_test whereA-6.1 {
+  CREATE TABLE t1(a, b);
+  CREATE INDEX t1aa ON t1(a,a);
+  INSERT INTO t1 VALUES(1,2);
+  ANALYZE;
+  UPDATE sqlite_stat1 SET stat='27 3 3' WHERE idx='t1aa';
+  ANALYZE sqlite_schema;
+  PRAGMA reverse_unordered_selects (1) ;
+  SELECT a FROM t1 WHERE  a=1 OR a=2;
+} {1}
+
+
+finish_test