Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21968#discussion_r212956571
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/RowBasedHashMapGenerator.scala
---
@@ -48,6 +48,8 @@ class RowBasedHashMapGenerator(
val keySchema = ctx.addReferenceObj("keySchemaTerm", groupingKeySchema)
val valueSchema = ctx.addReferenceObj("valueSchemaTerm", bufferSchema)
+ val numVarLenFields =
groupingKeys.map(_.dataType).count(!UnsafeRow.isFixedLength(_))
--- End diff --
Do not remove the `TODO` comment below.
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