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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