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From Jie Li <>
Subject Map-only aggregation
Date Sat, 05 Jan 2013 03:46:42 GMT
Hi all,

Can Hive implement the aggregation as a Map-only job? As we know the
data may be pre-partitioned via PARTITION-BY or CLUSTERED-BY, so we
don't need the reduce phase to repartition the data.

The Bucket Join seems to take advantage of the buckets for joins, so I
wonder if there is some similar optimization for aggregations.


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