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https://issues.apache.org/jira/browse/IMPALA-12909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17886775#comment-17886775
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Wenzhe Zhou commented on IMPALA-12909:
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If a query access multiple JDBC tables without dependency, it's better to
retrieve data from those JDBC tables in parallel.
> Generate distributed plan for query accessing multiple JDBC tables
> ------------------------------------------------------------------
>
> Key: IMPALA-12909
> URL: https://issues.apache.org/jira/browse/IMPALA-12909
> Project: IMPALA
> Issue Type: Sub-task
> Components: Frontend
> Reporter: Wenzhe Zhou
> Assignee: Pranav Yogi Lodha
> Priority: Major
>
> For a query which access multiple JDBC tables, Planner generate single node
> plan. It's better to generate distributed plan so that JDBC read could be
> scheduled on executors. This restriction is due to current design of External
> data source framework because scan is single threaded. DataSourceScanNode
> cannot run in node other than coordinator.
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