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+# 2014-03-03
+#
+# 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 verifies that an OP_Copy operation is used instead of OP_SCopy
+# in a compound select in a case where the source register might be changed
+# before the copy is used.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix selectF
+
+do_execsql_test 1 {
+ BEGIN TRANSACTION;
+ CREATE TABLE t1(a, b, c);
+ INSERT INTO "t1" VALUES(1,'one','I');
+ CREATE TABLE t2(d, e, f);
+ INSERT INTO "t2" VALUES(5,'ten','XX');
+ INSERT INTO "t2" VALUES(6,NULL,NULL);
+
+ CREATE INDEX i1 ON t1(b, a);
+ COMMIT;
+}
+
+#explain_i {
+# SELECT * FROM t2
+# UNION ALL
+# SELECT * FROM t1 WHERE a<5
+# ORDER BY 2, 1
+#}
+
+do_execsql_test 2 {
+ SELECT * FROM t2
+ UNION ALL
+ SELECT * FROM t1 WHERE a<5
+ ORDER BY 2, 1
+} {6 {} {} 1 one I 5 ten XX}
+
+
+
+finish_test