Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/17810#discussion_r114068640 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/GeneratorFunctionSuite.scala --- @@ -91,7 +91,7 @@ class GeneratorFunctionSuite extends QueryTest with SharedSQLContext { val df = Seq((1, Seq(1, 2, 3)), (2, Seq())).toDF("a", "intList") checkAnswer( df.select(explode_outer('intList)), - Row(1) :: Row(2) :: Row(3) :: Nil) + Row(1) :: Row(2) :: Row(3) :: Row(null) :: Nil) --- End diff -- I see. Could we also update the document to explain the new behaviors? - https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala#L86 - https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/GenerateExec.scala#L53
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