I have 2 tables: X and Y.  I want to append the into a new table Z.  So, I
do this:

ibis -a X to ./Z

That works fine, and Z is now identical to X.  Then, I do this:

ibis -a Y to ./Z

It seems to append the rows, but the ./Z/-part.txt file is not the UNION of
X and Y as I expected.  Instead, it is identical to ./Y/-part.txt. The
columns from both X and Y are there as files under ./Z, it is just the
./Z/-part.txt which does not have all the columns.

What am I missing?
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