Sned original NDB error as warning to client

sql/ha_ndbcluster.cc:
  Send original NDB error as warning to client so it can be retrieved with SHOW WARNINGS or SHOW ERRORS.

sql/ha_ndbcluster.cc

@@ -134,9 +134,14 @@ static int ndb_to_mysql_error(const NdbError *err)
   uint i;
   for (i=0 ; err_map[i].ndb_err != err->code ; i++)
   {
-    if (err_map[i].my_err == -1)
+    if (err_map[i].my_err == -1){
+      // Push the NDB error message as warning
+      push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
+			  ER_GET_ERRMSG, ER(ER_GET_ERRMSG),
+			  err->code, err->message, "NDB");      
       return err->code;
     }
+  }
   return err_map[i].my_err;
 }
 
@@ -2188,7 +2193,7 @@ int ha_ndbcluster::index_read(byte *buf,
   default:
   case UNDEFINED_INDEX:
     DBUG_ASSERT(false);
-    return 1;
+    DBUG_RETURN(1);
     break;
   }