Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/20419
@rednaxelafx I understand your concern when `ctx.registerComment()` is
conditionally called.
If we call `ctx.registerComment()` with the specific identified multiple
times, how do we handle? (e.g. `Expression.genCode()` may be called multiple
times from different contexts.
I am sorry that I will slowly response next few days due to a short
vacation.
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