dongjoon-hyun commented on a change in pull request #26137: [SPARK-29490][SQL]
Reset 'WritableColumnVector' in 'RowToColumnarExec'
URL: https://github.com/apache/spark/pull/26137#discussion_r338704785
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/Columnar.scala
##########
@@ -454,6 +454,7 @@ case class RowToColumnarExec(child: SparkPlan) extends
UnaryExecNode {
override def next(): ColumnarBatch = {
cb.setNumRows(0)
+ vectors.foreach(_.reset())
Review comment:
This bug seems to exist in `branch-2.4`, doesn't it? With a proper UT, we
need to backport this to `branch-2.4`. Please update the JIRA issue `Affects
Versions` together.
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