Github user uncleGen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17202#discussion_r104904202
--- 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 --
`delayThreshold: String` can not be used to assert directly, like:
```
inputData.withWatermark("value", "1 month -40 days")
inputData.withWatermark("value", "-10 seconds")
```
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