viirya commented on a change in pull request #35362:
URL: https://github.com/apache/spark/pull/35362#discussion_r801353720
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -3843,8 +3843,8 @@ object TimeWindowing extends Rule[LogicalPlan] {
* The windows are calculated as below:
* maxNumOverlapping <- ceil(windowDuration / slideDuration)
* for (i <- 0 until maxNumOverlapping)
- * windowId <- ceil((timestamp - startTime) / slideDuration)
- * windowStart <- windowId * slideDuration + (i - maxNumOverlapping) *
slideDuration + startTime
+ * lastStart <- timestamp - (timestamp - startTime + windowDuration) %
windowDuration
Review comment:
Hmm, I suppose this is the window start time of last window. Don't we
need to consider slide duration when calculating last start? I think this is
only correct if the slide duration equals to window duration.
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