type of parameter assignment for parameters from variables added (BUG#4280)

mysql-test/r/ps.result:
  parameters from variables (for field creation)
mysql-test/t/ps.test:
  parameters from variables (for field creation)
sql/item.cc:
  type of parameter assignment for parameters from variables
sql/item.h:
  removed spaces at line ends in Item_param definition

mysql-test/r/ps.result

@@ -137,3 +137,17 @@ execute stmt1;
 FOUND_ROWS()
 0
 deallocate prepare stmt1;
+drop table t1;
+set @arg00=1;
+prepare stmt1 from ' create table t1 (m int) as select 1 as m ' ;
+execute stmt1 ;
+select m from t1;
+m
+1
+drop table t1;
+prepare stmt1 from ' create table t1 (m int) as select ? as m ' ;
+execute stmt1 using @arg00;
+select m from t1;
+m
+1
+drop table t1;

mysql-test/t/ps.test

@@ -140,3 +140,17 @@ execute stmt1;
 # Expect 0
 execute stmt1;
 deallocate prepare stmt1;
+drop table t1;
+
+#
+# parameters from variables (for field creation)
+#
+set @arg00=1;
+prepare stmt1 from ' create table t1 (m int) as select 1 as m ' ;
+execute stmt1 ;
+select m from t1;
+drop table t1;
+prepare stmt1 from ' create table t1 (m int) as select ? as m ' ;
+execute stmt1 using @arg00;
+select m from t1;
+drop table t1;

sql/item.cc

@@ -759,9 +759,13 @@ bool Item_param::set_from_user_var(THD *thd, const user_var_entry *entry)
     switch (entry->type) {
     case REAL_RESULT:
       set_double(*(double*)entry->value);
+      item_type= Item::REAL_ITEM;
+      item_result_type= REAL_RESULT;
       break;
     case INT_RESULT:
       set_int(*(longlong*)entry->value, 21);
+      item_type= Item::INT_ITEM;
+      item_result_type= INT_RESULT;
       break;
     case STRING_RESULT:
     {

sql/item.h

@@ -422,7 +422,7 @@ class Item_null :public Item
 
 class Item_param :public Item
 {
-public:    
+public:
   enum enum_item_param_state
   {
     NO_VALUE, NULL_VALUE, INT_VALUE, REAL_VALUE,
@@ -442,8 +442,8 @@ class Item_param :public Item
   String str_value_ptr;
   union
   {
-    longlong integer;                           
-    double   real;                              
+    longlong integer;
+    double   real;
     /*
       Character sets conversion info for string values.
       Character sets of client and connection defined at bind time are used
@@ -456,7 +456,7 @@ class Item_param :public Item
       /*
         This points at character set of connection if conversion
         to it is required (i. e. if placeholder typecode is not BLOB).
-        Otherwise it's equal to character_set_client (to simplify 
+        Otherwise it's equal to character_set_client (to simplify
         check in convert_str_value()).
       */
       CHARSET_INFO *final_character_set_of_str_value;
@@ -477,10 +477,10 @@ class Item_param :public Item
     supply for this placeholder in mysql_stmt_execute.
   */
   enum enum_field_types param_type;
-  /*         
+  /*
     Offset of placeholder inside statement text. Used to create
     no-placeholders version of this statement for the binary log.
-  */         
+  */
   uint pos_in_query;
 
   Item_param(uint pos_in_query_arg);
@@ -515,11 +515,11 @@ class Item_param :public Item
   const String *query_val_str(String *str) const;
 
   bool convert_str_value(THD *thd);
-  
+
   Item *new_item() { return new Item_param(pos_in_query); }
-  /* 
-    If value for parameter was not set we treat it as non-const 
-    so noone will use parameters value in fix_fields still 
+  /*
+    If value for parameter was not set we treat it as non-const
+    so noone will use parameters value in fix_fields still
     parameter is constant during execution.
   */
   virtual table_map used_tables() const