Merge with 4.0

vio/viosocket.c:
  Auto merged
mysql-test/t/group_by.test:
  Use local file
sql/sql_parse.cc:
  Merge with 4.0 to get bug fix for reconnect problem

sql/sql_parse.cc

@@ -656,12 +656,12 @@ static int check_connection(THD *thd)
 {
   uint connect_errors= 0;
   NET *net= &thd->net;
+  ulong pkt_len= 0;
+  char *end;
 
   DBUG_PRINT("info",
              ("New connection received on %s", vio_description(net->vio)));
 
-  vio_in_addr(net->vio,&thd->remote.sin_addr);
-
   if (!thd->host)                           // If TCP/IP connection
   {
     char ip[30];
@@ -671,6 +671,7 @@ static int check_connection(THD *thd)
     if (!(thd->ip= my_strdup(ip,MYF(0))))
       return (ER_OUT_OF_RESOURCES);
     thd->host_or_ip= thd->ip;
+    vio_in_addr(net->vio,&thd->remote.sin_addr);
 #if !defined(HAVE_SYS_UN_H) || defined(HAVE_mit_thread)
     /* Fast local hostname resolve for Win32 */
     if (!strcmp(thd->ip,"127.0.0.1"))
@@ -706,10 +707,10 @@ static int check_connection(THD *thd)
     DBUG_PRINT("info",("Host: %s",thd->host));
     thd->host_or_ip= thd->host;
     thd->ip= 0;
+    /* Reset sin_addr */
+    bzero((char*) &thd->remote, sizeof(thd->remote));
   }
   vio_keepalive(net->vio, TRUE);
-  ulong pkt_len= 0;
-  char *end;
   {
     /* buff[] needs to big enough to hold the server_version variable */
     char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];

vio/viosocket.c

@@ -272,6 +272,18 @@ my_bool vio_peer_addr(Vio * vio, char *buf, uint16 *port)
 }
 
 
+/*
+  Get in_addr for a TCP/IP connection
+
+  SYNOPSIS
+    vio_in_addr()
+    vio		vio handle
+    in		put in_addr here
+
+  NOTES
+    one must call vio_peer_addr() before calling this one
+*/
+
 void vio_in_addr(Vio *vio, struct in_addr *in)
 {
   DBUG_ENTER("vio_in_addr");