Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21192
Everything here should be rewritten if we go for the array way if I'm not
mistaken. In this case, I think we should better, in a way, do the array option
if we are all willing to add it within 2.4.0 to reduce the work and effort.
FWIW, I don't feel strongly about being too clever for introducung a custom
format of a string when we have other alternatives.
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