As I have mentioned previously, I will be presenting a session on Saturday at Power UserDays in Belgium on optimising large data sets in Power BI with aggregations https://sessionize.com/app/speaker/event/details/1667, but the crazy news is that I will also now be presenting another session focused on handling the most awkward of files, the multiformat flat file in Mapping Data Flows as well! Join me on Saturday to find out how to handle this really awkward ETL pattern! Sorry that you have to hear me droning on for multiple sessions, but I promise it will be worth it!