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+# 2013-05-07
+#
+# 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 compound SELECT statements
+# that have ORDER BY clauses with collating sequences that differ
+# from the collating sequence used for comparison in the compound.
+# 
+# Ticket 6709574d2a8d8b9be3a9cb1afbf4ff2de48ea4e7:
+# drh added on 2013-05-06 15:21:16:
+#
+# In the code shown below (which is intended to be run from the
+# sqlite3.exe command-line tool) the three SELECT statements should all
+# generate the same answer. But the third one does not. It is as if the
+# COLLATE clause on the ORDER BY somehow got pulled into the EXCEPT
+# operator. Note that the ".print" commands are instructions to the
+# sqlite3.exe shell program to output delimiter lines so that you can more
+# easily tell where the output of one query ends and the next query
+# begins. 
+# 
+#     CREATE TABLE t1(a);
+#     INSERT INTO t1 VALUES('abc'),('def');
+#     CREATE TABLE t2(a);
+#     INSERT INTO t2 VALUES('DEF');
+# 
+#     SELECT a FROM t1 EXCEPT SELECT a FROM t2 ORDER BY a;
+#     .print -----
+#     SELECT a FROM (SELECT a FROM t1 EXCEPT SELECT a FROM t2)
+#      ORDER BY a COLLATE nocase;
+#     .print -----
+#     SELECT a FROM t1 EXCEPT SELECT a FROM t2 ORDER BY a COLLATE nocase;
+# 
+# Bisecting shows that this problem was introduced in SQLite version 3.6.0
+# by check-in [8bbfa97837a74ef] on 2008-06-15. 
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+do_test selectE-1.0 {
+  db eval {
+    CREATE TABLE t1(a);
+    INSERT INTO t1 VALUES('abc'),('def'),('ghi');
+    CREATE TABLE t2(a);
+    INSERT INTO t2 VALUES('DEF'),('abc');
+    CREATE TABLE t3(a);
+    INSERT INTO t3 VALUES('def'),('jkl');
+
+    SELECT a FROM t1 EXCEPT SELECT a FROM t2
+     ORDER BY a COLLATE nocase;
+  }
+} {def ghi}
+do_test selectE-1.1 {
+  db eval {
+    SELECT a FROM t2 EXCEPT SELECT a FROM t3
+     ORDER BY a COLLATE nocase;
+  }
+} {abc DEF}
+do_test selectE-1.2 {
+  db eval {
+    SELECT a FROM t2 EXCEPT SELECT a FROM t3
+     ORDER BY a COLLATE binary;
+  }
+} {DEF abc}
+do_test selectE-1.3 {
+  db eval {
+    SELECT a FROM t2 EXCEPT SELECT a FROM t3
+     ORDER BY a;
+  }
+} {DEF abc}
+
+do_test selectE-2.1 {
+  db eval {
+    DELETE FROM t2;
+    DELETE FROM t3;
+    INSERT INTO t2 VALUES('ABC'),('def'),('GHI'),('jkl');
+    INSERT INTO t3 SELECT lower(a) FROM t2;
+    SELECT a COLLATE nocase FROM t2 EXCEPT SELECT a FROM t3
+     ORDER BY 1
+  }
+} {}
+do_test selectE-2.2 {
+  db eval {
+    SELECT a COLLATE nocase FROM t2 EXCEPT SELECT a FROM t3
+     ORDER BY 1 COLLATE binary
+  }
+} {}
+
+do_catchsql_test selectE-3.1 {
+  SELECT 1 EXCEPT SELECT 2 ORDER BY 1 COLLATE nocase EXCEPT SELECT 3;
+} {1 {ORDER BY clause should come after EXCEPT not before}}
+
+
+finish_test