How inplace in mysql online DDL works?
<p>We know that in MySQL5.6 we have new type of algorithm called inplace to alter the tables online i.e without locking the table for other operations (DML and DDL).</p>

<p>In algorith = COPY we know that it creates a new table and copy all the data there and rebuild everything.
But whats INPLACE actually do ? Any idea or document ?</p>