Github user liancheng commented on the issue:
https://github.com/apache/spark/pull/16156
BTW, I think this PR is a cleaner fix than #9940, which introduces a
temporary metadata while merging two `StructType`s and erased it in a later
phase. We may want to remove the hack done in #9940 later if possible. But for
now, let's make the fix as surgical as possible to lower the risk for 2.1
release.
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