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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