[GitHub] [spark] sadikovi commented on a diff in pull request #36677: [SPARK-39296][CORE][SQL] Replcace `Array.toString` with `Array.mkString`

["sadikovi (via GitHub)" <gi...@apache.org>]

sadikovi commented on code in PR #36677:
URL: https://github.com/apache/spark/pull/36677#discussion_r1152581161


##########
core/src/main/scala/org/apache/spark/deploy/worker/Worker.scala:
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@@ -516,7 +516,8 @@ private[deploy] class Worker(
         val cleanupFuture: concurrent.Future[Unit] = concurrent.Future {
           val appDirs = workDir.listFiles()
           if (appDirs == null) {
-            throw new IOException("ERROR: Failed to list files in " + appDirs)
+            throw new IOException(
+              s"ERROR: Failed to list files in ${appDirs.mkString("dirs(", ", ", ")")}")

Review Comment:
   @LuciferYang This will cause a NullPointerException error because appDirs is null.



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