Created new set_var_role class to handle the SET ROLE command

sql/set_var.cc

@@ -871,6 +871,25 @@ int set_var_password::update(THD *thd)
 #endif
 }
 
+/*****************************************************************************
+  Functions to handle SET ROLE
+*****************************************************************************/
+int set_var_role::check(THD *thd)
+{
+  /* nothing to check */
+  return 0;
+}
+
+int set_var_role::update(THD *thd)
+{
+#ifndef NO_EMBEDDED_ACCESS_CHECKS
+  return acl_setrole(thd, this->role.str);
+#else
+  return 0;
+#endif
+}
+
+
 /*****************************************************************************
   Functions to handle SET NAMES and SET CHARACTER SET
 *****************************************************************************/

sql/set_var.h

@@ -276,6 +276,17 @@ public:
   int update(THD *thd);
 };
 
+/* For SET ROLE */
+
+class set_var_role: public set_var_base
+{
+  LEX_STRING role;
+public:
+  set_var_role(LEX_STRING role_arg) : role(role_arg) {};
+  int check(THD *thd);
+  int update(THD *thd);
+};
+
 
 /* For SET NAMES and SET CHARACTER SET */