Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/18931#discussion_r132835926
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegenExec.scala
---
@@ -149,14 +149,65 @@ trait CodegenSupport extends SparkPlan {
ctx.freshNamePrefix = parent.variablePrefix
val evaluated = evaluateRequiredVariables(output, inputVars,
parent.usedInputs)
+
+ // Under certain conditions, we can put the logic to consume the rows
of this operator into
--- End diff --
Could you elaborate `certain conditions` in the comment?
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