Please check only this point.

diff -Narup ./008_mariadb-10.0.15-partition_direct_update/sql/item_sum.h

./009_mariadb-10.0.15-dbg/sql/item_sum.h

--- ./008_mariadb-10.0.15-partition_direct_update/sql/item_sum.h

2014-11-22 06:02:54.000000000 +0900

+++ ./009_mariadb-10.0.15-dbg/sql/item_sum.h 2014-11-29 17:02:32.059795158 +0900

@@ -1193,6 +1193,7 @@ public:

   enum Sumfunctype sum_func () const { return UDF_SUM_FUNC; }

   virtual bool have_field_update(void) const { return 0; }

+  virtual void no_rows_in_result() { clear(); }

   void clear();

   bool add();

   void reset_field() {};

When I tried using aggregate type UDF, it didn't work. So I tried to

add this line into Item_udf_sum class as MySQL 5.1's Item_sum class.

I will try to reproduce it.