Github user BryanCutler commented on the issue:
https://github.com/apache/spark/pull/20280
Thanks @HyukjinKwon and @felixcheung , I'm a bit worried too that this
might break someones code, but it doesn't affect `createDataFrame` from `Row`s,
it's only when the Row is serialized like going from an RDD of Rows `toDF`.
Even then the schema gets alphabetized, which I'm sure the users would agree
that it is strange.
I'm not sure about adding a config switch, it might be a little hard to add
and could be confusing to the user to explain that its only when serialized and
the schema would need to be sorted by the original Row keywords.
I'll go ahead and update the migration guide, and expand on the PR
description to hopefully make the change as clear as possible.
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