Yin Huai created HIVE-3511:
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Summary: Constant values in aggregation parameters should not be
attached to every map output row
Key: HIVE-3511
URL: https://issues.apache.org/jira/browse/HIVE-3511
Project: Hive
Issue Type: Improvement
Reporter: Yin Huai
Priority: Minor
When map-side-aggregation is disabled (hive.map.aggr=false), constant values in
aggregation parameters are attached to every map output row. For example, in
test case 'count.q'
(https://github.com/apache/hive/blob/trunk/ql/src/test/results/clientpositive/count.q.out).
For count(1), if hive.map.aggr=false, '1' will be attached to every output row
of ReduceSinkOperator.
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