Github user liancheng commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13807#discussion_r67880034
  
    --- 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 --
    
    Shall we add the original outer join test case here?


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