Jared Westover shares some findings:
In Part One, we saw that simple scalar user-defined functions (UDFs) perform as well as inline code in a Fabric warehouse. But with a more complex UDF, does performance change? If it drops, is the code-reuse convenience worth the price?
I’m surprised that the performance profile was so good. I had assumed it would perform like T-SQL user-defined functions—namely, worse in general.