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https://issues.apache.org/jira/browse/SPARK-50492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun closed SPARK-50492.
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> Fix java.util.NoSuchElementException when event time column is dropped after
> dropDuplicatesWithinWatermark
> ----------------------------------------------------------------------------------------------------------
>
> Key: SPARK-50492
> URL: https://issues.apache.org/jira/browse/SPARK-50492
> Project: Spark
> Issue Type: Task
> Components: Structured Streaming
> Affects Versions: 3.5.0, 3.5.1, 3.5.2, 3.5.3, 4.0.0
> Reporter: Livia Zhu
> Assignee: Livia Zhu
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.5.4, 4.0.0
>
>
> Consider the following query:
> ```
> val result = inputData.toDF()
> .select("_1", "_2")
> .withColumn("timestamp", to_timestamp($"_2", "yyyy-MM-dd HH:mm:ss"))
> .withWatermark("timestamp", "24 hours")
> .dropDuplicatesWithinWatermark("timestamp")
> .select("_1")[]
> ```
>
> Currently, the ColumnPruning optimization will prune the `timestamp` column
> since it is not selected in the final Project, leading to a
> `java.util.NoSuchElementException` when we try to get the event time column
> in DeduplicateWithinWatermarkExec.
>
> We need to update the references for the DeduplicateWithinWatermark logical
> plan node so that the event time column is included in the references.
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