Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17202#discussion_r104944765
--- 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 --
Sorry that last example didn't make sense, it's not a single number. It
just doesn't seem like you need to reproduce this conversion to check what you
want to, which is that the two fields aren't negative.
`require(parsedDelay.milliseconds >= 0 && parsedDelay.months >= 0)`
In fact, I wonder if this should be some kind of method of
CalendarInterval, like `isNegative`? it's not that trivial to decide if an
interval is negative, and maybe other places do this.
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