Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/20021
I checked some call site. Here is [one
example](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/hash.scala#L285)
that `arguments` has `ev.value` instead of local variable.
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