gengliangwang opened a new pull request #23987: [SPARK-27049][SQL] Create util 
class to support handling partition values in file source V2
URL: https://github.com/apache/spark/pull/23987
 
 
   ## What changes were proposed in this pull request?
   
   While I am migrating other data sources, I find that we should abstract the 
logic that:
   1. converting safe `InternalRow`s into `UnsafeRow`s 
   2. appending partition values to the end of the result row if existed
   
   This PR proposes to support handling partition values in file source v2 
abstraction by adding a util class `PartitionReaderWithPartitionValues`.
   
   ## How was this patch tested?
   
   Existing unit tests
   

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