Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/21699
> Considering you can just make a call to withColumn first I'm not really
convinced in the utility of this PR.
Purpose of the PR is to make pivot API consistent to `groupBy` and clear.
Our users/clients shouldn't google workarounds like `withColumn` to apply the
`pivot()` functions. I believe we should follow [the principle of least
astonishment
(POLA)](https://en.wikipedia.org/wiki/Principle_of_least_astonishment). Some of
our clients forms `Column` expressions programmatically as a result of
calculation. And for now, instead of just passing `Column` variable to
`pivot()`, they have to modify whole expression, and inject projection or
`withColumn`. /cc @ssimeonov
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