BUG#12943 - post-merge fix

mysql-test/r/select.result:
  post-merge fix
mysql-test/t/select.test:
  post-merge fix

mysql-test/r/select.result

@@ -2922,6 +2922,7 @@ a	b	b
 select * from t1 inner join t2 using (a);
 a	b	b
 1	10	10
+drop table t1, t2;
 create table t1 (a int, c int);
 create table t2 (b int);
 create table t3 (b int, a int);

mysql-test/t/select.test

@@ -2499,6 +2499,9 @@ insert into t2 values (1,10);
 # both queries should produce the same result
 select * from t1 inner join t2 using (A);
 select * from t1 inner join t2 using (a);
+drop table t1, t2;
+
+#
 # Bug #12943 Incorrect nesting of [INNER| CROSS] JOIN due to unspecified
 #            associativity in the parser.
 #