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https://issues.apache.org/jira/browse/SPARK-37447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-37447.
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Fix Version/s: 3.3.0
Resolution: Fixed
Issue resolved by pull request 34691
[https://github.com/apache/spark/pull/34691]
> Cache LogicalPlan.isStreaming() in a lazy val
> ---------------------------------------------
>
> Key: SPARK-37447
> URL: https://issues.apache.org/jira/browse/SPARK-37447
> Project: Spark
> Issue Type: Improvement
> Components: Optimizer
> Affects Versions: 3.2.0
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Major
> Fix For: 3.3.0
>
>
> The default implementation of `LogicalPlan.isStreaming()` calls
> `children.exists(_.isStreaming)`. This can be expensive for large trees, so
> as a performance optimization I think we should cache the result in a private
> lazy val.
> This is especially important for programs that programmatically construct
> huge query plans because that will result in multiple analysis passes (and
> therefore multiple invocations of rules which call `isStreaming`). For
> example, this the `isStreaming` check accounts for a significant portion of
> the time in `DeduplicateRelations` (> 20% in my local tests).
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