Hello Everyone! Currently I am implementing 10177. But I have one doubt I am not sure how to implement a function which will create hidden level 2/3 field for server. Suppose we create a function (say add_hidden_field(.....)) which will add the field to table T. But the issue is where should we call this function in mysql_prepare_create_table / mysql_prepare_alter_table or init_from_binary_frm_image Doing it from init_from_binary_frm_image make sense because this way server and slave frm of table T will be same (We have decided that we wont log hidden level 2/3 field to binlog) , But the issue is optimizer wont be ready to decide whether we require a hidden level 3 field at that time. We can also do it from mysql_prepare_create_table , but I dont think this wont be good idea because at this time optimizer wont be ready plus this will complicate binlog handling. Or may be we should have a function which can modify table object any time. But I am not sure if it is possible/good idea ? What you guys think ? -- Regards Sachin Setiya Software Engineer at MariaDB