Github user bdrillard commented on the issue:
https://github.com/apache/spark/pull/16648
@kiszk Sure, I'm glad to help make this change easier to review. I'll first
make a PR that focuses on code splitting into nested classes. There should be a
test case with a number of columns that is high enough to induce at least one
instance of generating a nested class, but still low enough to not trigger
failure based on the amount of global mutable state. If that PR is reviewed and
is considered acceptable, we can open a second to address global mutable state.
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