Update to split sorted data sequentially and avoid simultaneous open files#2281
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Fixes #2276
Updated sort to set sub-sort order when sorted with tags. This will set the SO as unsorted and SS as unsorted::.
On split, if the data is sorted by the tag with which it is being split, split is made sequentially instead of opening output files in parallel. If data is not sorted by the split key, split is made by opening output files in parallel as existed.