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:
     {