Github user uncleGen commented on a diff in the pull request: https://github.com/apache/spark/pull/17202#discussion_r104899893 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala --- @@ -576,6 +576,11 @@ class Dataset[T] private[sql]( val parsedDelay = Option(CalendarInterval.fromString("interval " + delayThreshold)) .getOrElse(throw new AnalysisException(s"Unable to parse time delay '$delayThreshold'")) + val delayMs = { + val millisPerMonth = CalendarInterval.MICROS_PER_DAY / 1000 * 31 + parsedDelay.milliseconds + parsedDelay.months * millisPerMonth + } + assert(delayMs >= 0, s"delay threshold should not be a negative time: $delayThreshold") --- End diff -- @srowen Thanks for you review! > Why compute all this -- don't you just mean to assert about delayThreshold? I do mean to check the `delayThreshold`. `delayThreshold` is converted from `String` to `CalendarInterval`. `CalendarInterval` divides the `delayThreshold` into two parts, i.e. month (contain year and month) and microseconds of rest. (https://github.com/apache/spark/blob/master/common/unsafe/src/main/java/org/apache/spark/unsafe/types/CalendarInterval.java#L86) (https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/EventTimeWatermarkExec.scala#L87) > this derived value can only be negative if the input is right? Sorry, I dont get what you mean.
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