niuge01 opened a new pull request #3602: [CARBONDATA-3676] Support clean carbon 
data files of stages.
URL: https://github.com/apache/carbondata/pull/3602
 
 
    ### Why is this PR needed?
    At the end of the CarbonInsertFromStageCommand, the stage files will be 
cleared, but the data files which referenced by stage files will be not 
cleared. This could lead to a large backlog of data files。
    
    ### What changes were proposed in this PR?
   Provide a new command to allows us to delete data files which referenced by 
disabled table stages.
   
   The new command is CarbonDeleteStageCommand.
       
    ### Does this PR introduce any user interface change?
    - Yes
   
    ### Is any new testcase added?
    - Yes
   
       
   

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