Item_uint::save_in_field() added to take into account bigint->decimal case

.bzrignore

@@ -540,3 +540,4 @@ libmysql/vio_priv.h
 libmysql_r/vio_priv.h
 hardcopy.0
 scripts/make_sharedlib_distribution
+sql/udf_example.so

mysql-test/r/bigint.result

@@ -67,3 +67,11 @@ select * from t1 limit 9999999999;
 id	a
 9999999999	1
 drop table t1;
+CREATE TABLE t1 ( quantity decimal(60,0));
+insert into t1 values (10000000000000000000);
+insert into t1 values ('10000000000000000000');
+select * from t1;
+quantity
+10000000000000000000
+10000000000000000000
+drop table t1;

mysql-test/t/bigint.test

@@ -46,3 +46,15 @@ insert into t1 values (null,1);
 select * from t1;
 select * from t1 limit 9999999999;
 drop table t1;
+
+#
+# Item_uint::save_to_field()
+# BUG#1845
+#
+
+CREATE TABLE t1 ( quantity decimal(60,0));
+insert into t1 values (10000000000000000000);
+insert into t1 values ('10000000000000000000');
+select * from t1;
+drop table t1;
+

sql/item.cc

@@ -548,6 +548,19 @@ bool Item_string::save_in_field(Field *field, bool no_conversions)
   return 0;
 }
 
+bool Item_uint::save_in_field(Field *field, bool no_conversions)
+{
+  longlong nr=val_int();
+  if (null_value)
+    return set_field_to_null(field);
+  field->set_notnull();
+  if (nr < 0)
+    field->store(ulonglong2double(nr));
+  else
+    field->store(nr);
+  return 0;
+}
+
 bool Item_int::save_in_field(Field *field, bool no_conversions)
 {
   longlong nr=val_int();

sql/item.h

@@ -232,6 +232,7 @@ class Item_uint :public Item_int
   String *val_str(String*);
   void make_field(Send_field *field);
   Item *new_item() { return new Item_uint(name,max_length); }
+  bool save_in_field(Field *field, bool no_conversions);
   bool fix_fields(THD *thd,struct st_table_list *table_list)
   {
     unsigned_flag= 1;