xuanyuanking opened a new pull request #23327: [SPARK-26222][SQL] Track file 
listing time
URL: https://github.com/apache/spark/pull/23327
 
 
   ## What changes were proposed in this pull request?
   
   Tracking file listing time and add them into scan node's metrics, also add 
the start and end timestamp metrics.
   
![image](https://user-images.githubusercontent.com/4833765/50058268-cacfd200-01b0-11e9-95dc-b2093fc54178.png)
   
   
   ## How was this patch tested?
   
   Add new tests in SQLMetricsSuite.
   

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