Why spark streaming does not support groupingsets

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Why spark streaming does not support groupingsets

ashok.blend
We have scenario where we wanted to generate groupy  on specific set of
dimensions. Grouping sets solves our purpose, but its not supported in spark
streaming. We cannot go for cube as it generates lot of combination which
will be useless for us.
So wanted to know if there is any specific reason why its not supported ?



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