Update spark/src/main/scala/org/apache/comet/DataTypeSupport.scala

Thanks 👍

Co-authored-by: Andy Grove <agrove@apache.org>

Author: hsiang-c

spark/src/main/scala/org/apache/comet/DataTypeSupport.scala

@@ -52,7 +52,9 @@ trait DataTypeSupport {
         true
       case t: DataType if t.typeName == "timestamp_ntz" =>
         true
-      case _ => false
+      case other => 
+        fallbackReasons += s"Unsupported type: $other"
+        false
     }
 
   /**