Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19938
actually there is one real problem: after we fold many global variables
into an array, the variable name may become something like `arr[1]`, which
can't be used as the parameter name.
Localize the global variables in current expression/operator is one
solution, another one is generating parameter names instead of reusing the
input variable name.
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