Navis created HIVE-3972:
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Summary: Support using multiple reducer for fetching order by
results
Key: HIVE-3972
URL: https://issues.apache.org/jira/browse/HIVE-3972
Project: Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Navis
Assignee: Navis
Priority: Minor
Queries for fetching results which have lastly "order by" clause make final MR
run with single reducer, which can be too much. For example,
{code}
select value, sum(key) as sum from src group by value order by sum;
{code}
If number of reducer is reasonable, multiple result files could be merged into
single sorted stream in the fetcher level.
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