[GitHub] [spark] wangyum opened a new pull request #29436: [SPARK-32620][SQL] Reset the numPartitions metric when DPP is enabled

[GitBox]

wangyum opened a new pull request #29436:
URL: https://github.com/apache/spark/pull/29436


   ### What changes were proposed in this pull request?
   
   This pr reset the `numPartitions` metric when DPP is enabled.
   
   
   ### Why are the changes needed?
   
   Fix metric issue.
   
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   
   ### How was this patch tested?
   
   Unit test and manual test
   
   For [this test 
case](https://github.com/apache/spark/blob/18cac6a9f0bf4a6d449393f1ee84004623b3c893/sql/core/src/test/scala/org/apache/spark/sql/DynamicPartitionPruningSuite.scala#L252-L280).
   
   Before this pr:
   
![image](https://user-images.githubusercontent.com/5399861/90301798-9310b480-ded4-11ea-9294-49bcaba46f83.png)
   
   After this pr:
   
![image](https://user-images.githubusercontent.com/5399861/90301709-0fef5e80-ded4-11ea-942d-4d45d1dd15bc.png)
   
   


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