Github user gczsjdy commented on the issue:
https://github.com/apache/spark/pull/19862
This is actually a small change, but it can provide not small optimization
for users who don't use `WholeStageCodegen`, for example there're still some
users who use under 2.0 version of Spark.
Also, the behavior of codegen and non-codegen code paths are supposed to be
the same, so in this way it is a 'bug'.
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