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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