Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/22657
@kiszk It has been already parallelized by @srowen:
https://github.com/apache/spark/blob/eaafcd8a22db187e87f09966826dcf677c4c38ea/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala#L115
. What is the reason to reduce the number of zones there?
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