Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/21968#discussion_r212799711 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/RowBasedHashMapGenerator.scala --- @@ -44,6 +44,12 @@ class RowBasedHashMapGenerator( groupingKeySchema, bufferSchema) { override protected def initializeAggregateHashMap(): String = { + val numVarLenFields = groupingKeys.map(_.dataType).count { --- End diff -- Nit: can't this just be `.count(!UnsafeRow.isFixedLength(_))`?
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