Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21021#discussion_r180310842
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala ---
@@ -324,6 +324,30 @@ class DataFrameFunctionsSuite extends QueryTest with
SharedSQLContext {
assert(intercept[AnalysisException] {
df3.selectExpr("sort_array(a)").collect()
}.getMessage().contains("only supports array input"))
+
+ checkAnswer(
+ df.select(array_sort($"a"), array_sort($"b")),
+ Seq(
+ Row(Seq(1, 2, 3), Seq("a", "b", "c")),
+ Row(Seq[Int](), Seq[String]()),
+ Row(null, null))
+ )
+ checkAnswer(
+ df.selectExpr("array_sort(a)", "array_sort(b)"),
+ Seq(
+ Row(Seq(1, 2, 3), Seq("a", "b", "c")),
+ Row(Seq[Int](), Seq[String]()),
--- End diff --
Maybe `Seq.empty[Int]`
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