How does proxysql handle the AuthMoreData packet in mysql connection phase?

[raffertyyu]

I recently studied the packet process in MySQL connection phase, using MySQL and proxysql source code as examples. When I was looking up the MySQL dev documentation, I found some packages very unique, like AuthMoreData. Based on the documentation, I don't quite understand when MySQL will send this package. Does proxysql have code to handle this packet, because I haven't found it in the code yet? I'm wonder what will happen if proxysql received such a packet without predefined.