Description
Is your feature request related to a problem or challenge? Please describe what you are trying to do.
datafusion is in process of removing their built-in window-functions, which our current window function relies on. sum has already been removed which brakes the q11_important_stock_identification.py tpch example.
Additional context
AggregateFunction::Sum enum variant is still defined, but can not be used.
I suspect that the proper solution is to register the new UDAFs with the function registry.
As a workaround for releasing 39, I explicitly match on name == "sum" and redirect to the UDAF.
UDAF Migration Epic: apache/datafusion#8709