Same column names "" in both datasets. They are renamed to "_x" and "____y" respectively.

Message type

NOTIFICATION

Bricks

Join Data

Reason

A message to notify you that both input data tables contain identical non-key columns and that they were renamed to eliminate confusion

How to solve

If expected - no additional actions are needed. Potentially, you either should rename columns, use them as keys or filter them out if needed.

Same column names "__" in both datasets. They are renamed to "___x" and "____y" respectively.