turboFei opened a new pull request #26086: [SPARK-29302] Make the file name of 
a task for dynamic partition overwrite be unique
URL: https://github.com/apache/spark/pull/26086
 
 
   ### What changes were proposed in this pull request?
   Now, for a dynamic partition overwrite operation, the filename of a task 
output is determinable.
   
   So, if speculation is enabled, a task would conflict with its relative 
speculation task.
   In this PR, I make the file name of a task for dynamic partition overwrite 
be unique.
   ### Why are the changes needed?
   
   Data may be corrupted without this PR.
   
   ### Does this PR introduce any user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   Existing UT.

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