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https://issues.apache.org/jira/browse/IMPALA-12909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenzhe Zhou reassigned IMPALA-12909:
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Assignee: Pranav Yogi Lodha
> 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 Impala could open
> multiple JDBC connections in parallel. 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.
> There is no issue for query with join between JDBC table and non JDBC table.
> We have this issue only for all scans as JDBC table scans.
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