[GitHub] [spark] turboFei opened a new pull request #26339: [SPARK-27194][SPARK-29302][SQL] Fix the issue that for dynamic partition overwrite a task would conflict with its speculative task

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turboFei opened a new pull request #26339: [SPARK-27194][SPARK-29302][SQL] Fix the issue that for dynamic partition overwrite a task would conflict with its speculative task
URL: https://github.com/apache/spark/pull/26339
 
 
   ### What changes were proposed in this pull request?
   As described in https://issues.apache.org/jira/browse/SPARK-27194 and https://issues.apache.org/jira/browse/SPARK-29302,  there is an issue for dynamic partition overwrite.
   
   Based on the proposal by @advancedxy (see details in https://github.com/apache/spark/pull/24142#issuecomment-516723747), I implement this PR.
   
   1. Set a working path under stagingDir named `_temporary`.
   2. Set task name to `_temporary/partitionPath/taskAttemptId/filename` firstly.
   3. after task completed, rename `_temporary/partitionPath/taskAttemptId/filename` to  `partitionPath/filename`.
   
   ### Why are the changes needed?
   
   For dynamic partition overwrite, a task may conflict with its speculative task.
   
   
   ### Does this PR introduce any user-facing change?
   No.
   
   
   ### How was this patch tested?
   Existing UT.
   

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