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About Worklog
The MySQL Worklog are design specifications for some of the items that may be considered for future development.

WL#2553: Parallel SELECT .. UNION

Affects: Server-7.0   —   Status: Assigned   —   Priority: Low 

SELECT ... UNION ALL SELECT ... UNION ALL
are very suitable for parallelisation

The idea here is to perform each SELECT query in a separate thread and
join the results of the UNION in the main thread.


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