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Whether to enable the bucketed group by from bucketed partitions/tables.

hive.optimize.countdistinct

• Default Value: true
• Added In: Hive 3.0.0

Whether to rewrite count distinct into 2 stages, i.e., the first stage uses multiple reducers with the count distinct key and the second stage uses a single reducer without key.

hive.multigroupby.singlemr

• Default Value: false
• Added In: Hive 0.8.0 with HIVE-2056
• Removed In: Hive 0.9.0 by HIVE-2621 (see hive.multigroupby.singlereducer)

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