diff -ru ../mysql-5.1.22-rc-dist/include/mysql_com.h ./include/mysql_com.h
--- ../mysql-5.1.22-rc-dist/include/mysql_com.h	2007-09-24 06:29:33.000000000 -0400
+++ ./include/mysql_com.h	2007-12-27 13:09:11.000000000 -0500
@@ -115,6 +115,8 @@
 #define REFRESH_MASTER          128     /* Remove all bin logs in the index
 					   and truncate the index */
 
+#define REFRESH_CONNECTION	256 /* restore session to default */
+
 /* The following can't be set with mysql_refresh() */
 #define REFRESH_READ_LOCK	16384	/* Lock tables for read */
 #define REFRESH_FAST		32768	/* Intern flag */
diff -ru ../mysql-5.1.22-rc-dist/sql/sql_parse.cc ./sql/sql_parse.cc
--- ../mysql-5.1.22-rc-dist/sql/sql_parse.cc	2007-09-24 06:30:14.000000000 -0400
+++ ./sql/sql_parse.cc	2007-12-27 13:12:04.000000000 -0500
@@ -6396,6 +6396,14 @@
       result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
     my_dbopt_cleanup();
   }
+  if (options && REFRESH_CONNECTION)
+  {
+	if (reset_connection(thd))
+	{
+		result=1;
+		thd->fatal_error();
+	}
+  }
   if (options & REFRESH_HOSTS)
     hostname_cache_refresh();
   if (thd && (options & REFRESH_STATUS))
diff -ru ../mysql-5.1.22-rc-dist/sql/sql_repl.cc ./sql/sql_repl.cc
--- ../mysql-5.1.22-rc-dist/sql/sql_repl.cc	2007-09-24 06:29:58.000000000 -0400
+++ ./sql/sql_repl.cc	2007-12-27 13:14:57.000000000 -0500
@@ -1019,6 +1019,36 @@
 }
 
 /*
+ Reset a connection - destroys all temporary tables,
+ session variables, routine cache, prepared statements
+ associated with a connection (thd).
+ 
+ SYNOPSIS
+   reset_connection()
+   thd		Thread handler
+   
+ RETURN
+   0	ok
+   1	error
+
+*/
+
+int reset_connection (THD *thd)
+{
+
+	status_var_increment(thd->status_var.com_other);
+
+    thd->change_user();
+    thd->clear_error();                         // if errors from rollback
+
+    /* Clear variables that are allocated */
+    thd->user_connect= 0;
+		
+	return 0;
+
+}
+
+/*
 
   Kill all Binlog_dump threads which previously talked to the same slave
   ("same" means with the same server id). Indeed, if the slave stops, if the
diff -ru ../mysql-5.1.22-rc-dist/sql/sql_repl.h ./sql/sql_repl.h
--- ../mysql-5.1.22-rc-dist/sql/sql_repl.h	2007-09-24 06:30:24.000000000 -0400
+++ ./sql/sql_repl.h	2007-12-27 13:13:23.000000000 -0500
@@ -50,6 +50,7 @@
 		   const char* log_file_name2, ulonglong log_pos2);
 int reset_slave(THD *thd, MASTER_INFO* mi);
 int reset_master(THD* thd);
+int reset_connection(THD *thd);
 bool purge_master_logs(THD* thd, const char* to_log);
 bool purge_master_logs_before_date(THD* thd, time_t purge_time);
 bool log_in_use(const char* log_name);