Fixed error handling bug

sql/sql_class.h:
  new function for clean out error message

sql/log_event.cc

@@ -841,9 +841,9 @@ int Query_log_event::exec_event(struct st_relay_log_info* rli)
     VOID(pthread_mutex_lock(&LOCK_thread_count));
     thd->query_id = query_id++;
     VOID(pthread_mutex_unlock(&LOCK_thread_count));
-    thd->query_error = 0;			// clear error
-    thd->net.last_errno = 0;
-    thd->net.last_error[0] = 0;
+    thd->query_error= 0;			// clear error
+    thd->clear_error();
+    
     thd->slave_proxy_id = thread_id;		// for temp tables
 	
     /*

sql/mini_client.cc

@@ -451,6 +451,7 @@ mc_simple_command(MYSQL *mysql,enum enum_server_command command,
 
   mysql->net.last_error[0]=0;
   mysql->net.last_errno=0;
+  mysql->net.report_error=0;
   mysql->info=0;
   mysql->affected_rows= ~(my_ulonglong) 0;
   net_clear(net);			/* Clear receive buffer */

sql/sql_base.cc

@@ -1464,9 +1464,8 @@ static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
       }
     }
     pthread_mutex_unlock(&LOCK_open);
-    thd->net.last_error[0]=0;				// Clear error message
-    thd->net.last_errno=0;
-    error=0;
+    thd->clear_error();				// Clear error message
+    error= 0;
     if (openfrm(path,alias,
 		(uint) (HA_OPEN_KEYFILE | HA_OPEN_RNDFILE | HA_GET_INDEX |
 			 HA_TRY_READ_ONLY),
@@ -1476,8 +1475,7 @@ static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
 	(entry->file->is_crashed() && entry->file->check_and_repair(thd)))
     {
       /* Give right error message */
-      thd->net.last_error[0]=0;
-      thd->net.last_errno=0;
+      thd->clear_error();
       my_error(ER_NOT_KEYFILE, MYF(0), name, my_errno);
       sql_print_error("Error: Couldn't repair table: %s.%s",db,name);
       if (entry->file)
@@ -1486,8 +1484,7 @@ static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
     }
     else
     {
-      thd->net.last_error[0]=0;			// Clear error message
-      thd->net.last_errno=0;
+      thd->clear_error();			// Clear error message
     }
     pthread_mutex_lock(&LOCK_open);
     unlock_table_name(thd,&table_list);

sql/sql_class.h

@@ -625,6 +625,12 @@ public:
   void add_changed_table(const char *key, long key_length);
   CHANGED_TABLE_LIST * changed_table_dup(const char *key, long key_length);
   int send_explain_fields(select_result *result);
+  inline void clear_error()
+  {
+    net.last_error[0]= 0;
+    net.last_errno= 0;
+    net.report_error= 0;
+  }
 };
 
 /*

sql/sql_insert.cc

@@ -1180,7 +1180,7 @@ bool delayed_insert::handle_inserts(void)
       table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
       using_ignore=1;
     }
-    thd.net.last_errno = 0; // reset error for binlog
+    thd.clear_error(); // reset error for binlog
     if (write_record(table,&info))
     {
       info.error_count++;				// Ignore errors

sql/sql_parse.cc

@@ -857,8 +857,7 @@ bool do_command(THD *thd)
   old_timeout=net->read_timeout;
   // Wait max for 8 hours
   net->read_timeout=(uint) thd->variables.net_wait_timeout;
-  net->last_error[0]=0;				// Clear error message
-  net->last_errno=0;
+  thd->clear_error();				// Clear error message
 
   net_new_transaction(net);
   if ((packet_length=my_net_read(net)) == packet_error)