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https://issues.apache.org/jira/browse/SPARK-26327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16717888#comment-16717888
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ASF GitHub Bot commented on SPARK-26327:
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dongjoon-hyun commented on issue #23287: [SPARK-26327][SQL][BACKPORT-2.4] Bug 
fix for `FileSourceScanExec` metrics update
URL: https://github.com/apache/spark/pull/23287#issuecomment-446341597
 
 
   Thank you. Yep. I'll wait and monitor today and proceed like that.

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> Metrics in FileSourceScanExec not update correctly while 
> relation.partitionSchema is set
> ----------------------------------------------------------------------------------------
>
>                 Key: SPARK-26327
>                 URL: https://issues.apache.org/jira/browse/SPARK-26327
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: Yuanjian Li
>            Assignee: Yuanjian Li
>            Priority: Major
>             Fix For: 3.0.0
>
>
> As currently approach in `FileSourceScanExec`, the metrics of "numFiles" and 
> "metadataTime"(fileListingTime) were updated while lazy val 
> `selectedPartitions` initialized in the scenario of relation.partitionSchema 
> is set. But `selectedPartitions` will be initialized by `metadata` at first, 
> which is called by `queryExecution.toString` in 
> `SQLExecution.withNewExecutionId`. So while the 
> `SQLMetrics.postDriverMetricUpdates` called, there's no corresponding 
> liveExecutions in SQLAppStatusListener, the metrics update is not work.



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