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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