view.test, view.result:

  Expanded the test case for bug #6120 to cover
  DROP VIEW / CREATE VIEW scenario.
sql_view.cc:
  Expanded the fix for bug #6120 to cover the case of
  DROP VIEW / CREATE_VIEW.

mysql-test/r/view.result

@@ -1945,6 +1945,11 @@ ALTER VIEW v1 AS SELECT s1 AS s1, s2 AS s2 FROM t1;
 CALL p1();
 s1	s2
 1	2
+DROP VIEW v1;
+CREATE VIEW v1 AS SELECT s2 AS s1, s1 AS s2 FROM t1;
+CALL p1();
+s1	s2
+2	1
 DROP PROCEDURE p1;
 DROP VIEW v1;
 DROP TABLE t1;

mysql-test/t/view.test

@@ -1784,6 +1784,9 @@ CREATE PROCEDURE p1 () SELECT * FROM v1;
 CALL p1();
 ALTER VIEW v1 AS SELECT s1 AS s1, s2 AS s2 FROM t1;
 CALL p1();
+DROP VIEW v1;
+CREATE VIEW v1 AS SELECT s2 AS s1, s1 AS s2 FROM t1;
+CALL p1();
 
 DROP PROCEDURE p1;
 DROP VIEW v1;

sql/sql_view.cc

@@ -1004,6 +1004,7 @@ bool mysql_drop_view(THD *thd, TABLE_LIST *views, enum_drop_mode drop_mode)
     if (my_delete(path, MYF(MY_WME)))
       goto err;
     query_cache_invalidate3(thd, view, 0);
+    sp_cache_invalidate();
     VOID(pthread_mutex_unlock(&LOCK_open));
   }
   send_ok(thd);