Major Description
When use sdk to write carbondata files, use System.nanoTime() assign to the start timestamp and use System.nanoTime() assign to taskNo currently.
There are two bug here, first System.nanoTime() is different from System.currentTimeMillis(), it can only be used to measure elapsed time and is not related to any other notion of system or wall-clock time. Second, the carbondata file name written by sdk was different from written by spark.
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