requre BASE TABLE for HANDLER (BUG#5277)

mysql-test/r/view.result:
  HANDLER with VIEW
mysql-test/t/view.test:
  HANDLER with VIEW
sql/sql_handler.cc:
  requre BASE TABLE for HANDLER

mysql-test/r/view.result

@@ -1270,3 +1270,9 @@ s1
 7
 drop view v1;
 drop table t1;
+create table t1 (s1 int);
+create view v1 as select * from t1;
+handler v1 open as xx;
+ERROR HY000: 'test.v1' is not BASE TABLE
+drop view v1;
+drop table t1;

mysql-test/t/view.test

@@ -1230,3 +1230,13 @@ insert into v1 values (1) on duplicate key update s1 = 7;
 select * from t1;
 drop view v1;
 drop table t1;
+
+#
+# HANDLER with VIEW
+#
+create table t1 (s1 int);
+create view v1 as select * from t1;
+-- error 1346
+handler v1 open as xx;
+drop view v1;
+drop table t1;

sql/sql_handler.cc

@@ -51,7 +51,11 @@ int mysql_ha_open(THD *thd, TABLE_LIST *tables)
 {
   HANDLER_TABLES_HACK(thd);
   uint counter;
+
+  /* for now HANDLER can be used only for real TABLES */
+  tables->required_type= FRMTYPE_TABLE;
   int err=open_tables(thd, tables, &counter);
+
   HANDLER_TABLES_HACK(thd);
   if (err)
     return -1;