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[CARBONDATA-2685][DataMap] Parallize datamap rebuild processing for s…
…egments Currently in carbondata, while rebuilding datamap, one spark job will be started for each segment and all the jobs are executed serailly. If we have many historical segments, the rebuild will takes a lot of time. Here we optimize the procedure for datamap rebuild and start one start for each segments, all the tasks can be done in parallel in one spark job. This closes #2443
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