Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/22773
My impression so far was that we note things at migration notes when they
are improvements (not bugs), and non-trivial and related to backward
compatibility.
Shall we clarify what to document at migration guide? Otherwise we should
document everything related with, let's say, external changes, deprecation
removal, and many other changes related with column names.
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