This was "internal". The mapping works like this: we take the
`DataFusionError` and call `find_root` which should traverse the
`External(...)` chain (even through Arrow) to find the last error that
is not within the Arrow/DataFusion land. This is then mapped by us.
`DataFusionError::External(...)` is no further inspected and mapped
straight to "internal". I think this if fine because in the end we're
mostly dealing w/ DataFusion stuff anyways.
I've slightly changed the error mapping in the planner to emit
`DataFusionError::Plan(...)` instead which we map to "invalid argument".
I think this is way better for the user.
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
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