diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullFunctions.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullFunctions.scala
index 3d3d13b0ac9ee..98c67084642e3 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullFunctions.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullFunctions.scala
@@ -86,7 +86,7 @@ case class Coalesce(children: Seq[Expression]) extends Expression {
  * Evaluates to `true` if it's NaN or null
  */
 case class IsNaN(child: Expression) extends UnaryExpression
-with Predicate with ImplicitCastInputTypes {
+  with Predicate with ImplicitCastInputTypes {
 
   override def inputTypes: Seq[AbstractDataType] = Seq(TypeCollection(DoubleType, FloatType))
 
diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ConditionalExpressionSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ConditionalExpressionSuite.scala
index cbd624988dfb2..afa143bd5f331 100644
--- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ConditionalExpressionSuite.scala
+++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ConditionalExpressionSuite.scala
@@ -68,12 +68,6 @@ class ConditionalExpressionSuite extends SparkFunSuite with ExpressionEvalHelper
     testIf(_.toString, StringType)
   }
 
-  test("in") {
-    checkEvaluation(In(Literal("^Ba*n"), Seq(Literal("^Ba*n"))), true)
-    checkEvaluation(In(Literal("^Ba*n"), Seq(Literal("aa"), Literal("^Ba*n"))), true)
-    checkEvaluation(In(Literal("^Ba*n"), Seq(Literal("aa"), Literal("^n"))), false)
-  }
-
   test("case when") {
     val row = create_row(null, false, true, "a", "b", "c")
     val c1 = 'a.boolean.at(0)
diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/NullFunctionsSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/NullFunctionsSuite.scala
index 221dcba0d8b5d..765cc7a969b5d 100644
--- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/NullFunctionsSuite.scala
+++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/NullFunctionsSuite.scala
@@ -45,6 +45,16 @@ class NullFunctionsSuite extends SparkFunSuite with ExpressionEvalHelper {
     }
   }
 
+  test("IsNaN") {
+    checkEvaluation(IsNaN(Literal(Double.NaN)), true)
+    checkEvaluation(IsNaN(Literal(Float.NaN)), true)
+    checkEvaluation(IsNaN(Literal(math.log(-3))), true)
+    checkEvaluation(IsNaN(Literal.create(null, DoubleType)), true)
+    checkEvaluation(IsNaN(Literal(Double.PositiveInfinity)), false)
+    checkEvaluation(IsNaN(Literal(Float.MaxValue)), false)
+    checkEvaluation(IsNaN(Literal(5.5f)), false)
+  }
+
   test("coalesce") {
     testAllTypes { (value: Any, tpe: DataType) =>
       val lit = Literal.create(value, tpe)
diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/PredicateSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/PredicateSuite.scala
index 052abc51af5fd..2173a0c25c645 100644
--- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/PredicateSuite.scala
+++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/PredicateSuite.scala
@@ -114,16 +114,10 @@ class PredicateSuite extends SparkFunSuite with ExpressionEvalHelper {
     checkEvaluation(
       And(In(Literal(1), Seq(Literal(1), Literal(2))), In(Literal(2), Seq(Literal(1), Literal(2)))),
       true)
-  }
 
-  test("IsNaN") {
-    checkEvaluation(IsNaN(Literal(Double.NaN)), true)
-    checkEvaluation(IsNaN(Literal(Float.NaN)), true)
-    checkEvaluation(IsNaN(Literal(math.log(-3))), true)
-    checkEvaluation(IsNaN(Literal.create(null, DoubleType)), true)
-    checkEvaluation(IsNaN(Literal(Double.PositiveInfinity)), false)
-    checkEvaluation(IsNaN(Literal(Float.MaxValue)), false)
-    checkEvaluation(IsNaN(Literal(5.5f)), false)
+    checkEvaluation(In(Literal("^Ba*n"), Seq(Literal("^Ba*n"))), true)
+    checkEvaluation(In(Literal("^Ba*n"), Seq(Literal("aa"), Literal("^Ba*n"))), true)
+    checkEvaluation(In(Literal("^Ba*n"), Seq(Literal("aa"), Literal("^n"))), false)
   }
 
   test("INSET") {