diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
index 2d9bccc0854a3..a556ac9f12947 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
@@ -219,6 +219,12 @@ abstract class BinaryArithmetic extends BinaryOperator
 
   protected val evalMode: EvalMode.Value
 
+  private lazy val internalDataType: DataType = (left.dataType, right.dataType) match {
+    case (DecimalType.Fixed(p1, s1), DecimalType.Fixed(p2, s2)) =>
+      resultDecimalType(p1, s1, p2, s2)
+    case _ => left.dataType
+  }
+
   protected def failOnError: Boolean = evalMode match {
     // The TRY mode executes as if it would fail on errors, except that it would capture the errors
     // and return null results.
@@ -234,11 +240,7 @@ abstract class BinaryArithmetic extends BinaryOperator
     case _ => super.checkInputDataTypes()
   }
 
-  override def dataType: DataType = (left.dataType, right.dataType) match {
-    case (DecimalType.Fixed(p1, s1), DecimalType.Fixed(p2, s2)) =>
-      resultDecimalType(p1, s1, p2, s2)
-    case _ => left.dataType
-  }
+  override def dataType: DataType = internalDataType
 
   // When `spark.sql.decimalOperations.allowPrecisionLoss` is set to true, if the precision / scale
   // needed are out of the range of available values, the scale is reduced up to 6, in order to