diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
index 4d537cc0adfea..f7955bc923395 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
@@ -3112,13 +3112,12 @@ case class ArrayDistinct(child: Expression)
     (data: Array[AnyRef]) => new GenericArrayData(data.distinct.asInstanceOf[Array[Any]])
   } else {
     (data: Array[AnyRef]) => {
-      val arrayBuffer = new scala.collection.mutable.ArrayBuffer[Any]
+      val arrayBuffer = new scala.collection.mutable.ArrayBuffer[AnyRef]
       var alreadyStoredNull = false
-      var found = false
       for (i <- 0 until data.length) {
         if (data(i) != null) {
-          found = false
-          var j = 0;
+          var found = false
+          var j = 0
           while (!found && j < arrayBuffer.size) {
             val va = arrayBuffer(j)
             found = (va != null) && ordering.equiv(va, data(i))
diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CollectionExpressionsSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CollectionExpressionsSuite.scala
index 00adae14b89b5..603073b40d7aa 100644
--- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CollectionExpressionsSuite.scala
+++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CollectionExpressionsSuite.scala
@@ -1364,6 +1364,8 @@ class CollectionExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper
       ArrayType(DoubleType))
     val a7 = Literal.create(Seq(1.123f, 0.1234f, 1.121f, 1.123f, 1.1230f, 1.121f, 0.1234f),
       ArrayType(FloatType))
+    val a8 =
+      Literal.create(Seq(2, 1, 2, 3, 4, 4, 5).map(_.toString.getBytes), ArrayType(BinaryType))
 
     checkEvaluation(new ArrayDistinct(a0), Seq(2, 1, 3, 4, 5))
     checkEvaluation(new ArrayDistinct(a1), Seq.empty[Integer])
@@ -1373,6 +1375,7 @@ class CollectionExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper
     checkEvaluation(new ArrayDistinct(a5), Seq(true, false))
     checkEvaluation(new ArrayDistinct(a6), Seq(1.123, 0.1234, 1.121))
     checkEvaluation(new ArrayDistinct(a7), Seq(1.123f, 0.1234f, 1.121f))
+    checkEvaluation(new ArrayDistinct(a8), Seq(2, 1, 3, 4, 5).map(_.toString.getBytes))
 
     // complex data types
     val b0 = Literal.create(Seq[Array[Byte]](Array[Byte](5, 6), Array[Byte](1, 2),