[GitHub] spark pull request #16304: [SPARK-18894][SS] Fix event time watermark delay ...

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

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

    https://github.com/apache/spark/pull/16304#discussion_r94287885
  
    --- Diff: sql/core/src/test/scala/org/apache/spark/sql/streaming/EventTimeWatermarkSuite.scala ---
    @@ -124,6 +137,33 @@ class WatermarkSuite extends StreamTest with BeforeAndAfter with Logging {
         )
       }
     
    +  test("delay in months and years handled correctly") {
    +    val currentTimeMs = System.currentTimeMillis
    +    val currentTime = new Date(currentTimeMs)
    +
    +    val input = MemoryStream[Long]
    +    val aggWithWatermark = input.toDF()
    +      .withColumn("eventTime", $"value".cast("timestamp"))
    +      .withWatermark("eventTime", "2 years 5 months")
    +      .groupBy(window($"eventTime", "5 seconds") as 'window)
    +      .agg(count("*") as 'count)
    +      .select($"window".getField("start").cast("long").as[Long], $"count".as[Long])
    +
    +    def monthsSinceEpoch(date: Date): Int = { date.getYear * 12 + date.getMonth }
    +
    +    testStream(aggWithWatermark)(
    +      AddData(input, currentTimeMs / 1000),
    +      CheckAnswer(),
    +      AddData(input, currentTimeMs / 1000),
    +      CheckAnswer(),
    +      assertEventStats { e =>
    +        assert(timestampFormat.parse(e.get("max")).getTime === (currentTimeMs / 1000) * 1000)
    +        val watermarkTime = timestampFormat.parse(e.get("watermark"))
    +        assert(monthsSinceEpoch(currentTime) - monthsSinceEpoch(watermarkTime) === 29)
    --- End diff --
    
    All the recent builds failed in this check.
    ```
    [info] - delay in months and years handled correctly *** FAILED *** (325 milliseconds)
    [info]   30 did not equal 29 (EventTimeWatermarkSuite.scala:193)
    ```


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