Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/12138#discussion_r58553204 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -1659,11 +1665,12 @@ object TimeWindowing extends Rule[LogicalPlan] { val windowEnd = windowStart + window.windowDuration CreateNamedStruct( - Literal(WINDOW_START) :: windowStart :: --- End diff -- Previously we manually set the output of Expand here as `TimestampType` (`windowAttr`). As `windowStart` and `windowEnd` are producing long values, when we infer output from Expand's projections, we will get `LongType` instead of `TimestampType`. So we need to explicitly convert the `LongType` to `TimestampType`.
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