Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16304#discussion_r93349575
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -387,7 +387,7 @@ class StreamExecution(
lastExecution.executedPlan.collect {
case e: EventTimeWatermarkExec if e.eventTimeStats.value.count >
0 =>
logDebug(s"Observed event time stats:
${e.eventTimeStats.value}")
- e.eventTimeStats.value.max - e.delay.milliseconds
+ math.max(0, e.eventTimeStats.value.max - e.delayMs)
--- End diff --
`newWatermarkMs` can be negative. Image the user is processing some very
old data which is before 1970.
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