[GitHub] [spark] wangyum edited a comment on pull request #28032: [SPARK-31264][SQL] Repartition by dynamic partition columns before insert partition table

Sat, 13 Jun 2020 08:40:34 -0700 


wangyum edited a comment on pull request #28032:
URL: https://github.com/apache/spark/pull/28032#issuecomment-643575562


   Thank you @gengliangwang The root cause is it generates too many files:
   Repartition by dynamic partition columns can significantly reduce the number 
of files:
   
![image](https://user-images.githubusercontent.com/5399861/84561331-0d5e7480-ad7e-11ea-944c-3ed24403332b.png)
   
![image](https://user-images.githubusercontent.com/5399861/84561322-033c7600-ad7e-11ea-8c2c-7f93f48ee02a.png)
   
   and  it takes too much time to rename files:
   
![image](https://user-images.githubusercontent.com/5399861/84561473-4a773680-ad7f-11ea-992a-b993deb87864.png)
   


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