Create 'main' test directory and move 't' and 'r' there

mysql-test/main/order_fill_sortbuf.test

@@ -0,0 +1,30 @@
+#
+# This test does a create-select with ORDER BY, where there is so many
+# rows MySQL needs to use a merge during the sort phase.
+#
+
+--disable_warnings
+drop table if exists t1,t2;
+--enable_warnings
+
+set @@sort_buffer_size=32804;
+
+CREATE TABLE `t1` (
+  `id` int(11) NOT NULL default '0',
+  `id2` int(11) NOT NULL default '0',
+  `id3` int(11) NOT NULL default '0');
+let $1=4000;
+--disable_query_log
+begin;
+while ($1)
+ {
+   eval insert into t1 (id,id2,id3) values ($1,$1,$1);
+   dec $1;
+ }
+commit;
+--enable_query_log
+create table t2 select id2 from t1 order by id3;
+select count(*) from t2;
+drop table t1,t2;
+
+# End of 4.1 tests