Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11274#discussion_r55102849
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegen.scala
---
@@ -116,6 +119,39 @@ trait CodegenSupport extends SparkPlan {
}
/**
+ * Returns source code to evaluate all the variables, and clear the
code of them, to prevent
--- End diff --
Some variables could be generated in the middle of the plan, for example,
aggregate, and join, so we can't always use the references of current plan to
determine which expression is used or not. So I have two different functions
here, we could pass in the used references to the function below.
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