Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20386#discussion_r164680877
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/execution/streaming/MemorySinkV2Suite.scala
 ---
    @@ -41,19 +41,22 @@ class MemorySinkV2Suite extends StreamTest with 
BeforeAndAfter {
       test("continuous writer") {
         val sink = new MemorySinkV2
         val writer = new MemoryStreamWriter(sink, OutputMode.Append())
    -    writer.commit(0,
    -      Array(
    -        MemoryWriterCommitMessage(0, Seq(Row(1), Row(2))),
    -        MemoryWriterCommitMessage(1, Seq(Row(3), Row(4))),
    -        MemoryWriterCommitMessage(2, Seq(Row(6), Row(7)))
    -      ))
    +    val messages = Seq(
    +      MemoryWriterCommitMessage(0, Seq(Row(1), Row(2))),
    +      MemoryWriterCommitMessage(1, Seq(Row(3), Row(4))),
    +      MemoryWriterCommitMessage(2, Seq(Row(6), Row(7)))
    +    )
    +    messages.foreach(writer.add(_))
    --- End diff --
    
    nit:
    ```
    writer.add(MemoryWriterCommitMessage(0, Seq(Row(1), Row(2))))
    writer.add(MemoryWriterCommitMessage(1, Seq(Row(3), Row(4))))
    ..
    ```


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