Added the SET ROLE command to the grammar

sql/lex.h

@@ -489,6 +489,7 @@ static SYMBOL symbols[] = {
   { "REVOKE",		SYM(REVOKE)},
   { "RIGHT",		SYM(RIGHT)},
   { "RLIKE",		SYM(REGEXP)},	/* Like in mSQL2 */
+  { "ROLE",             SYM(ROLE_SYM)},
   { "ROLLBACK",		SYM(ROLLBACK_SYM)},
   { "ROLLUP",		SYM(ROLLUP_SYM)},
   { "ROUTINE",		SYM(ROUTINE_SYM)},

sql/sql_yacc.yy

@@ -1260,6 +1260,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  RETURN_SYM                    /* SQL-2003-R */
 %token  REVOKE                        /* SQL-2003-R */
 %token  RIGHT                         /* SQL-2003-R */
+%token  ROLE_SYM
 %token  ROLLBACK_SYM                  /* SQL-2003-R */
 %token  ROLLUP_SYM                    /* SQL-2003-R */
 %token  ROUTINE_SYM                   /* SQL-2003-N */
@@ -1687,6 +1688,8 @@ END_OF_INPUT
 
 %type <is_not_empty> opt_union_order_or_limit
 
+%type <NONE> ROLE_SYM
+
 %%
 
 
@@ -13490,6 +13493,7 @@ keyword_sp:
         | RESOURCES                {}
         | RESUME_SYM               {}
         | RETURNS_SYM              {}
+        | ROLE_SYM                 {}
         | ROLLUP_SYM               {}
         | ROUTINE_SYM              {}
         | ROWS_SYM                 {}
@@ -13839,6 +13843,12 @@ option_value:
               MYSQL_YYABORT;
             lex->var_list.push_back(var);
           }
+        | ROLE_SYM ident_or_text
+          {
+            LEX *lex = Lex;
+            set_var_role *var= new set_var_role($2);
+            lex->var_list.push_back(var);
+          }
         | PASSWORD equal text_or_password
           {
             LEX *lex= thd->lex;