Github user huaxingao commented on a diff in the pull request: https://github.com/apache/spark/pull/21050#discussion_r183925443 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CollectionExpressionsSuite.scala --- @@ -105,4 +105,18 @@ class CollectionExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper checkEvaluation(ArrayContains(a3, Literal("")), null) checkEvaluation(ArrayContains(a3, Literal.create(null, StringType)), null) } + + test("Array Unique") { + val a0 = Literal.create(Seq(2, 1, 2, 3, 4, 4, 5), ArrayType(IntegerType)) + val a1 = Literal.create(Seq[Integer](), ArrayType(IntegerType)) --- End diff -- @HyukjinKwon Thanks for your comments. Will fix the problems. Sorry for the late reply.
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