Github user srowen commented on the issue:
https://github.com/apache/spark/pull/16676
@xiaoyesoso we usually do not merge changes this trivial, that have no real
impact on the code. I agree it can be removed. It would be helpful if you can
look for other unused variables -- IDEs like IntelliJ can do this. We could try
to fix many of these at once. If it's your first contribution we often will
merge something like this anyway but not regularly.
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