fixed printing of real constants (BUG#5160)

mysql-test/r/view.result:
  VIEW with floating point (long bumber) as column
mysql-test/t/view.test:
  VIEW with floating point (long bumber) as column
sql/item.cc:
  fixed printing of real constants
sql/item.h:
  fixed printing of real constants

mysql-test/r/view.result

@@ -1217,3 +1217,8 @@ t1	MyISAM	9	Fixed	0	0	0	21474836479	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL
 v1	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	#	#	NULL	NULL	NULL	NULL	view
 drop view v1;
 drop table t1;
+create view v1 as select 99999999999999999999999999999999999999999999999999999 as col1;
+show create view v1;
+Table	Create Table
+v1	CREATE VIEW `test`.`v1` AS select 99999999999999999999999999999999999999999999999999999 AS `col1`
+drop view v1;

mysql-test/t/view.test

@@ -1161,3 +1161,10 @@ show table status;
 show table status;
 drop view v1;
 drop table t1;
+
+#
+# VIEW with floating point (long bumber) as column
+#
+create view v1 as select 99999999999999999999999999999999999999999999999999999 as col1;
+show create view v1;
+drop view v1;

sql/item.cc

@@ -1756,6 +1756,21 @@ int Item_real::save_in_field(Field *field, bool no_conversions)
   return field->store(nr);
 }
 
+
+void Item_real::print(String *str)
+{
+  if (presentation)
+  {
+    str->append(presentation);
+    return;
+  }
+  char buffer[20];
+  String num(buffer, sizeof(buffer), &my_charset_bin);
+  num.set(value, decimals, &my_charset_bin);
+  str->append(num);
+}
+
+
 /****************************************************************************
 ** varbinary item
 ** In string context this is a binary string

sql/item.h

@@ -698,12 +698,13 @@ class Item_uint :public Item_int
 
 class Item_real :public Item_num
 {
+  char *presentation;
 public:
   double value;
   // Item_real() :value(0) {}
   Item_real(const char *str_arg, uint length) :value(my_atof(str_arg))
   {
-    name=(char*) str_arg;
+    presentation= name=(char*) str_arg;
     decimals=(uint8) nr_of_decimals(str_arg);
     max_length=length;
     fixed= 1;
@@ -711,12 +712,12 @@ class Item_real :public Item_num
   Item_real(const char *str,double val_arg,uint decimal_par,uint length)
     :value(val_arg)
   {
-    name=(char*) str;
+    presentation= name=(char*) str;
     decimals=(uint8) decimal_par;
     max_length=length;
     fixed= 1;
   }
-  Item_real(double value_par) :value(value_par) { fixed= 1; }
+  Item_real(double value_par) :presentation(0), value(value_par) { fixed= 1; }
   int save_in_field(Field *field, bool no_conversions);
   enum Type type() const { return REAL_ITEM; }
   enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE; }
@@ -732,6 +733,7 @@ class Item_real :public Item_num
   void cleanup() {}
   Item *new_item() { return new Item_real(name,value,decimals,max_length); }
   Item_num *neg() { value= -value; return this; }
+  void print(String *str);
 };