Hi Timour, When one compiles 5.3, it produces the following warnings which I believe fall into your turf. Could you please fix them: item_subselect.cc: In member function ‘bool subselect_rowid_merge_engine::init(MY_BITMAP*, MY_BITMAP*)’: item_subselect.cc:4826: warning: ignoring return value of ‘int handler::ha_rnd_init(bool)’, declared with attribute warn_unused_result item_subselect.cc: In member function ‘virtual bool subselect_rowid_merge_engine::partial_match()’: item_subselect.cc:5007: warning: ignoring return value of ‘int handler::ha_rnd_init(bool)’, declared with attribute warn_unused_result item_subselect.cc: In member function ‘virtual bool subselect_table_scan_engine::partial_match()’: item_subselect.cc:5174: warning: ignoring return value of ‘int handler::ha_rnd_init(bool)’, declared with attribute warn_unused_result sql_class.cc: In member function ‘virtual bool select_materialize_with_stats::create_result_table(THD*, List<Item>*, bool, ulonglong, const char*, bool)’: sql_class.cc:3020: warning: the address of ‘int stat(const char*, stat*)’ will always evaluate as ‘true’ BR Sergey -- Sergey Petrunia, Software Developer Monty Program AB, http://askmonty.org Blog: http://s.petrunia.net/blog