Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11740#discussion_r56376958
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegen.scala
---
@@ -396,7 +401,7 @@ case class WholeStageCodegen(child: SparkPlan) extends
UnaryNode with CodegenSup
s"""
|$evaluateInputs
|${code.code.trim}
- |append(${code.value}.copy());
+ |append(${code.value}$doCopy);
--- End diff --
If there is only one row will be buffered here, we do not need to copy it.
The parent of WholeStageCodegen will do the copy if needed.
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