Jon Apgar created IMPALA-7843:
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Summary: MT_DOP should be configurable per subquery
Key: IMPALA-7843
URL: https://issues.apache.org/jira/browse/IMPALA-7843
Project: IMPALA
Issue Type: Improvement
Reporter: Jon Apgar
MT_DOP > 0 will cause queries with JOIN statements to fail, however the
*subqueries* within the main query _might_ otherwise have been able to run
successfully with MT_DOP > 0.
A use-case for subqueries may be to limit the size of complex joins or
eliminate redundant aggregation in the outer query, By allowing MT_DOP > 0 on
subqueries you could significantly speed up the entire query.
MT_DOP is not the only session variable which may be effectively configured per
subquery. Perhaps there should be a way of specifying applicable variables
within the select statement of a query.
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