Plans a Rename before the second input that gives each column whose name
differs from the first input's at its position the first input's name, a
case-only difference included. undefined when the inputs differ in
count, or no name differs, or a renamed column's name is the name of
another column of the first input (the same columns in another order:
renaming would move values silently), or the Rename itself isn't valid, or
the Concat still isn't (its types differ, or can't be converted when it
converts types).
Plans a Rename before the second input that gives each column whose name differs from the first input's at its position the first input's name, a case-only difference included.
undefinedwhen the inputs differ in count, or no name differs, or a renamed column's name is the name of another column of the first input (the same columns in another order: renaming would move values silently), or the Rename itself isn't valid, or the Concat still isn't (its types differ, or can't be converted when it converts types).