[sql] Import reference version of SQLite 3.8.7.4.

third_party/sqlite/sqlite-src-3080704/test/selectF.test

+# 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