Github user viirya commented on the issue:
https://github.com/apache/spark/pull/11674
Oh. I see. After looking at the source file at that time:
https://github.com/viirya/spark-1/blob/0068ff81bf9e90194ba9dc5631ac85683b9606f2/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/BoundAttribute.scala#L68-L70
The `genCode` method directly returns the code of the used `currentVars`. I
guess the returned code might be pasted into generated code previously.
After iterations of revamping, this is not anymore.
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