Bug #12671631 CREATE TABLE .. LIKE .. FEDERATED TABLE

              CRASHES WITH AUTO_INCREMENT COLUMN

Description:- Creating a federated table with AUTO_INCREMENT
column using LIKE clause results in a server crash.

Analysis:- Creating a federated table with AUTO_INCREMENT
column using LIKE clause results in a federated server
crash due to the uninitialized connection structure(mysql).
Also due to unassigned connection string for the remote
server, at the time of preparation of "create_info"
structure, the creation of any federated table using LIKE
clause fails with an error, "ERROR 1 (HY000): server name:
'' doesn't exist!". This  bug is not only with
AUTO_INCREMENT but in all creations of federated tables with
LIKE clause.

Fix :- In ha_federated::info(), "mysql->insert_id" assigned
to "stats.auto_increment_value" only when there is an
active connection. This fixes the crash issue. For creating
the federated table with LIKE clause, connection string is
assigned at the time of preparation of "create_info"
structure.

sql/sql_table.cc

 /*
-   Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+   Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -5365,6 +5365,10 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
   if (create_info->storage_media == HA_SM_DEFAULT)
     create_info->storage_media= table->s->default_storage_media;
 
+  /* Creation of federated table with LIKE clause needs connection string */
+  if (!(used_fields & HA_CREATE_USED_CONNECTION))
+    create_info->connect_string= table->s->connect_string;
+
   restore_record(table, s->default_values);     // Empty record for DEFAULT
   Create_field *def;
 

storage/federated/ha_federated.cc

-/* Copyright (c) 2004, 2014, Oracle and/or its affiliates. All rights reserved.
+/* Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -2944,7 +2944,7 @@ int ha_federated::info(uint flag)
 
   }
 
-  if (flag & HA_STATUS_AUTO)
+  if ((flag & HA_STATUS_AUTO) && mysql)
     stats.auto_increment_value= mysql->insert_id;
 
   mysql_free_result(result);