How to create subtable in md-table in Angular Material 2?

Question

I need to create subtable (table or md-table, please see picture) in md-table. I use Angular 4.2.4 and Angular Material 2.0.0-beta.8. I could put my table only in the cell but not in a row. I played somehow with it here (an example is based on official example).

How can I solve this?

Answer 1

Regarding closed issue on GitHub it's impossible now and no plans to change it in future.