[GitHub] spark pull request #17735: [SPARK-20441][SPARK-20432][SS] Within the same st...

[zsxwing <gi...@git.apache.org>]

Github user zsxwing commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17735#discussion_r114425160
  
    --- Diff: sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamSuite.scala ---
    @@ -120,6 +141,32 @@ class StreamSuite extends StreamTest {
         assertDF(df)
       }
     
    +  test("Within the same streaming query, one StreamingRelation should only be transformed to one " +
    +    "StreamingExecutionRelation") {
    +    val df = spark.readStream.format(classOf[FakeDefaultSource].getName).load()
    +    var query: StreamExecution = null
    +    try {
    +      query =
    +        df.union(df)
    +          .writeStream
    +          .format("memory")
    +          .queryName("memory")
    +          .start()
    +          .asInstanceOf[StreamingQueryWrapper]
    +          .streamingQuery
    +      val executionRelations =
    +        query
    +          .logicalPlan
    --- End diff --
    
    you need to call `query.awaitInitialization` before accessing `logicalPlan`. Otherwise this test will be flaky.


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