Github user tcondie commented on a diff in the pull request: https://github.com/apache/spark/pull/15949#discussion_r88905225 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala --- @@ -422,6 +432,7 @@ class StreamExecution( val replacementMap = AttributeMap(replacements) val triggerLogicalPlan = withNewSources transformAllExpressions { case a: Attribute if replacementMap.contains(a) => replacementMap(a) + case t: CurrentTimestamp => CurrentBatchTimestamp(currentBatchTimestamp) --- End diff -- Good question. The purpose of the dedicated expression is to avoid having it pushed down below a stateful operator (e.g., aggregation). during optimization.
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