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https://issues.apache.org/jira/browse/IMPALA-12983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenzhe Zhou updated IMPALA-12983:
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Summary: Performance improvement for impala-impala federation (was: Push
down 'order by' to remote database server)
> Performance improvement for impala-impala federation
> ----------------------------------------------------
>
> Key: IMPALA-12983
> URL: https://issues.apache.org/jira/browse/IMPALA-12983
> Project: IMPALA
> Issue Type: Sub-task
> Components: Frontend
> Reporter: Wenzhe Zhou
> Assignee: Pranav Yogi Lodha
> Priority: Major
>
> "order by" cannot be pushed down to JDBC right now, but most of tpcds/tpch
> queries are using "order by ... limit ...", e.g top n. This results JDBC
> handler to retrieve all rows of remote table on remote database server, hence
> bad performance.
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