a fix (#11553: gives error if aggregate user-defined function in HAVING clause).

sql/sql_yacc.yy:
  a fix (#11553: gives error if aggregate user-defined function in HAVING clause).
  udf_sum_expr_list rule introduced and used for aggregate udf functions:            
    - call inc_in_sum_expr() before udf_expr_list parsing                            
      (as in_sum_expr rule does).

sql/sql_yacc.yy

@@ -644,7 +644,8 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 	NUM_literal
 
 %type <item_list>
-	expr_list udf_expr_list when_list ident_list ident_list_arg
+	expr_list udf_expr_list udf_sum_expr_list when_list ident_list 
+        ident_list_arg
 
 %type <key_type>
 	key_type opt_unique_or_fulltext constraint_key_type
@@ -3137,21 +3138,21 @@ simple_expr:
 	  { $$= new Item_func_trim($5,$3); }
 	| TRUNCATE_SYM '(' expr ',' expr ')'
 	  { $$= new Item_func_round($3,$5,1); }
-	| UDA_CHAR_SUM '(' udf_expr_list ')'
+	| UDA_CHAR_SUM '(' udf_sum_expr_list ')'
 	  {
 	    if ($3 != NULL)
 	      $$ = new Item_sum_udf_str($1, *$3);
 	    else
 	      $$ = new Item_sum_udf_str($1);
 	  }
-	| UDA_FLOAT_SUM '(' udf_expr_list ')'
+	| UDA_FLOAT_SUM '(' udf_sum_expr_list ')'
 	  {
 	    if ($3 != NULL)
 	      $$ = new Item_sum_udf_float($1, *$3);
 	    else
 	      $$ = new Item_sum_udf_float($1);
 	  }
-	| UDA_INT_SUM '(' udf_expr_list ')'
+	| UDA_INT_SUM '(' udf_sum_expr_list ')'
 	  {
 	    if ($3 != NULL)
 	      $$ = new Item_sum_udf_int($1, *$3);
@@ -3289,6 +3290,21 @@ udf_expr_list:
 	/* empty */	{ $$= NULL; }
 	| expr_list	{ $$= $1;};
 
+udf_sum_expr_list:
+	{
+	  LEX *lex= Lex;
+	  if (lex->current_select->inc_in_sum_expr())
+	  {
+	    yyerror(ER(ER_SYNTAX_ERROR));
+	    YYABORT;
+	  }
+	}
+	udf_expr_list
+	{
+	  Select->in_sum_expr--;
+	  $$= $2;
+	};
+
 sum_expr:
 	AVG_SYM '(' in_sum_expr ')'
 	  { $$=new Item_sum_avg($3); }