Wenzhe Zhou created IMPALA-13661:
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Summary: Support parallelism above JDBC tables for joins/aggregates
Key: IMPALA-13661
URL: https://issues.apache.org/jira/browse/IMPALA-13661
Project: IMPALA
Issue Type: Sub-task
Components: Frontend
Reporter: Wenzhe Zhou
Assignee: Pranav Yogi Lodha
Currently Impala planer generate single node plan with one scanner thread for
query accessing JDBC tables since table stats are not available for JDBC tables.
Even the JDBC fetching has to be single-threaded but we could use exchange or
row batch threading to parallelize multiple JDBC connections. This will improve
the performance significantly.
We need to change the planer to create multiple scanner threads for query which
access multiple jdbc tables with joins or aggregations.
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