Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/7225#discussion_r33892306
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/GeneratedAggregate.scala
---
@@ -241,7 +241,7 @@ case class GeneratedAggregate(
child.execute().mapPartitions { iter =>
// Builds a new custom class for holding the results of aggregation
for a group.
val initialValues = computeFunctions.flatMap(_.initialValues)
- val newAggregationBuffer = newProjection(initialValues, child.output)
+ val newAggregationBuffer = newProjection(initialValues,
child.output, mutableRow = true)
--- End diff --
We wrote `newAggregationBuffer(EmptyRow).asInstanceOf[MutableRow]` below, I
think that is the root case. cc @davies
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