Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/22789#discussion_r228749168
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegenExec.scala
---
@@ -146,7 +146,10 @@ trait CodegenSupport extends SparkPlan {
if (outputVars != null) {
assert(outputVars.length == output.length)
// outputVars will be used to generate the code for UnsafeRow, so
we should copy them
- outputVars.map(_.copy())
+ outputVars.map(_.copy()) match {
--- End diff --
What in `consume` is relying on a side effect of traversing the
`outputVars`?
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