UDF (user defined function) plugin SDK model(dll) not working properly(for aggregated function)

For the UDF aggregate model that calling 'x_init > x_clear > x_add > xxx > x_deinit' as the guide said,
but actually not calls 'x_clear > x_add' both on windows platform
only rest of functions(x_init > xxx > x_deinit) are called. but above two. So that canNOT implement aggregated plugin.
How to fix it?
(sample code at https://github.com/mysqludf/lib_mysqludf_ta/blob/master/src/ta_tr_win.c)

reference doc : https://mariadb.com/kb/en/creating-user-defined-functions/