Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/19518
In #19811, first, I will take a hybrid approach of outer (flat) global
variable and arrays. The threshold for # of global variables would be
configurable.
I will give high priority to primitive variables to place them at the outer
class due to performance.
> I think it would be great if we were able to declare variables which are
used only in an inner class in that inner class. Unfortunately, I think also
that this is not trivial to achieve at all.
It would be great if we could do this. For now, #19811 will not address
this.
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