liyunzhang_intel created PIG-5044:

             Summary: Create SparlCompiler#getSamplingJob in spark mode
                 Key: PIG-5044
             Project: Pig
          Issue Type: Sub-task
            Reporter: liyunzhang_intel
            Assignee: liyunzhang_intel

Like MRCompiler#getSamplingJob, we also need a function like that to sample 
data from a file, sort sampling data  and generate output by 

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