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[SPARK-11878][SQL] Eliminate distribute by in case group by is presen…
…t with exactly the same grouping expressi For queries like : select <> from table group by a distribute by a we can eliminate distribute by ; since group by will anyways do a hash partitioning Also applicable when user uses Dataframe API Author: Yash Datta <Yash.Datta@guavus.com> Closes apache#9858 from saucam/eliminatedistribute.
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