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Posted to issues-all@impala.apache.org by "Baike Xia (Jira)" <ji...@apache.org> on 2022/08/08 16:07:00 UTC
[jira] [Updated] (IMPALA-11485) Support pushdown LIMIT through UNION or LEFT/RIGHT OUTER JOIN
[ https://issues.apache.org/jira/browse/IMPALA-11485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Baike Xia updated IMPALA-11485:
-------------------------------
Summary: Support pushdown LIMIT through UNION or LEFT/RIGHT OUTER JOIN (was: Support pushdown LIMIT through UNION,LEFT/RIGHT OUTER JOIN)
> Support pushdown LIMIT through UNION or 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
> Priority: Major
>
> 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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