Baike Xia created IMPALA-11485:
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Summary: Support pushdown LIMIT through UNION,LEFT/RIGHT OUTER JOIN
Key: IMPALA-11485
URL: https://issues.apache.org/jira/browse/IMPALA-11485
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Reporter: Baike Xia
Pushdown LIMIT through UNION:
{code:java}
Transforms:
- Limit
- Union
- relation1
- relation2
..
Into:
- Limit
- Union
- Limit
- relation1
- Limit
- relation2
.. {code}
Pushdown LIMIT through LEFT/RIGHT OUTER JOIN:
{code:java}
Transforms:
- Limit
- Join
- left source
- right source
Into:
- Limit
- Join
- Limit (present if Join is left outer)
- left source
- Limit (present if Join is right outer)
- right source {code}
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