[GitHub] [spark] LuciferYang commented on a change in pull request #29836: [SPARK-32964][DSTREAMS] Pass all `streaming` module UTs in Scala 2.13

[GitBox <gi...@apache.org>]

LuciferYang commented on a change in pull request #29836:
URL: https://github.com/apache/spark/pull/29836#discussion_r492766515



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File path: streaming/src/main/scala/org/apache/spark/streaming/DStreamGraph.scala
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@@ -29,8 +28,8 @@ import org.apache.spark.util.Utils
 
 final private[streaming] class DStreamGraph extends Serializable with Logging {
 
-  private val inputStreams = new ArrayBuffer[InputDStream[_]]()
-  private val outputStreams = new ArrayBuffer[DStream[_]]()
+  private var inputStreams = Array.empty[InputDStream[_]]

Review comment:
       - default implementation of `mutable.Seq` is `ArrayBuffer`, it can't work.
   
   - default implementation of `immutable.Seq` is `List`, it can't work also
   
   - `mutable.ArraySeq` and `immutable.ArraySeq` both work, but still need use `var` because  they are not `Growable`




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