Chun Chen created HIVE-5358:
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Summary: ReduceSinkDeDuplication should ignore column orders when
check overlapping part of keys between parent and child
Key: HIVE-5358
URL: https://issues.apache.org/jira/browse/HIVE-5358
Project: Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Chun Chen
Assignee: Chun Chen
{code}
select key, value from (select key, value from src group by key, value) t group
by key, value;
{code}
This can be optimized by ReduceSinkDeDuplication
{code}
select key, value from (select key, value from src group by key, value) t group
by value, key;
{code}
However the sql above can't be optimized by ReduceSinkDeDuplication currently
due to different column orders of parent and child operator.
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