Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/22944#discussion_r230781583
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala
---
@@ -1556,6 +1556,14 @@ class DatasetSuite extends QueryTest with
SharedSQLContext {
df.where($"city".contains(new java.lang.Character('A'))),
Seq(Row("Amsterdam")))
}
+
+ test("SPARK-25942: typed aggregation on primitive data") {
--- End diff --
It should not be introduced recently. I think we encode primitive data as a
`value` field at beginning.
Because `AppendColumns` takes serializers' named expressions as
`newColumns`. For primitive data, it conflicts with original data attribute
`value`.
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