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https://issues.apache.org/jira/browse/SPARK-60850?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-60850:
-----------------------------------
Labels: pull-request-available (was: )
> Preserve watermark columns when pruning stream-stream joins
> -----------------------------------------------------------
>
> Key: SPARK-60850
> URL: https://issues.apache.org/jira/browse/SPARK-60850
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 5.0.0
> Reporter: Siying Dong
> Priority: Major
> Labels: pull-request-available
>
> When both sides of a stream-stream join have watermarks and the downstream
> projection only
> selects the join key, ColumnPruning can remove the event-time attributes from
> both join inputs.
> The physical stream-stream join then cannot identify and discard late input
> rows, allowing a
> late matching pair to be emitted.
> The join should retain watermarked input attributes as implicit references
> whenever it is
> stateful, even when those attributes are not used by the join condition or
> selected downstream.
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