Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/13807#discussion_r67887470 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala --- @@ -830,6 +830,13 @@ class DatasetSuite extends QueryTest with SharedSQLContext { ds.dropDuplicates("_1", "_2"), ("a", 1), ("a", 2), ("b", 1)) } + + test("SPARK-16097: Encoders.tuple should handle null object correctly") { + val enc = Encoders.tuple(Encoders.tuple(Encoders.STRING, Encoders.STRING), Encoders.STRING) + val data = Seq((("a", "b"), "c"), (null, "d")) + val ds = spark.createDataset(data)(enc) + checkDataset(ds, (("a", "b"), "c"), (null, "d")) + } --- End diff -- Actually that is not a valid test as the `ExpressionEncoder` is private and should not be used externally. But it does expose this bug and I added this test case which is valid externally.
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