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

    https://github.com/apache/spark/pull/21011#discussion_r180311581
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala ---
    @@ -413,6 +413,29 @@ class DataFrameFunctionsSuite extends QueryTest with 
SharedSQLContext {
         )
       }
     
    +  test("array_join function") {
    +    val df = Seq(
    +      (Seq[String]("a", "b"), ","),
    +      (Seq[String]("a", null, "b"), ","),
    +      (Seq[String](), ",")
    --- End diff --
    
    Maybe `Seq.empty[String]`


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