Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21968#discussion_r214246268 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/RowBasedHashMapGenerator.scala --- @@ -130,6 +134,12 @@ class RowBasedHashMapGenerator( } }.mkString(";\n") + val nullByteWriter = if (groupingKeySchema.map(_.nullable).forall(_ == false)) { --- End diff -- maybe name it `resetNullBits`?
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