Auto Join Walls and Columns

Is this topic still active? I tried to follow the steps in this post, but i failed!

I am trying to join geometry in a specific joinorder and do not want to join geometry which do not intersect.
For example wall shall always be cut an columns shall be the cutting object.
Mostly i am not sure how to use the list.filterbyboolmask command and how to use multiple loops in an python file.

Sadly i am not allowed to post my file. Maybe i am able to do so later.
I try to attach some photos. The list-failure says: the specified transformation is invalid.

Thank you upfront and regards
Ammo