pub unsafe extern "C" fn Natural_join_column_Natural_join_column1(
this: *mut Natural_join_column,
field_param: *mut Item_field,
tab: *mut TABLE_LIST
)pub unsafe extern "C" fn Natural_join_column_Natural_join_column1(
this: *mut Natural_join_column,
field_param: *mut Item_field,
tab: *mut TABLE_LIST
)