[GitHub] [spark] HyukjinKwon commented on a change in pull request #24362: [SPARK-27454][ML][SQL] Spark image datasource fail when encounter some illegal images

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HyukjinKwon commented on a change in pull request #24362: [SPARK-27454][ML][SQL] Spark image datasource fail when encounter some illegal images
URL: https://github.com/apache/spark/pull/24362#discussion_r275117268
 
 

 ##########
 File path: mllib/src/main/scala/org/apache/spark/ml/image/ImageSchema.scala
 ##########
 @@ -133,7 +133,13 @@ object ImageSchema {
    */
   private[spark] def decode(origin: String, bytes: Array[Byte]): Option[Row] = {
 
-    val img = ImageIO.read(new ByteArrayInputStream(bytes))
+    val img = try {
+      ImageIO.read(new ByteArrayInputStream(bytes))
+    } catch {
+      // Catch runtime exception because `ImageIO` may throw unexcepted `RuntimeException`.
+      // But do not catch the declared `IOException` (regarded as FileSystem failure)
+      case _: RuntimeException => null
 
 Review comment:
   Shall we add a test? 

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