Full automated data mapping is a very difficult problem (see semantic translation).
Some graphical data mapping tools allow users to "auto-connect" a source and a destination.
This provides visibility into the analytics pipeline and simplifies tracing errors back to their sources.
It also enables replaying specific portions or inputs of the data flow for step-wise debugging or regenerating lost output.
In fact, database systems have used such information, called data provenance, to address similar validation and debugging challenges already.