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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-4510) SQL: co-located query may calculate target partition in advance in some cases
Date Thu, 29 Dec 2016 09:50:58 GMT
Vladimir Ozerov created IGNITE-4510:
---------------------------------------

             Summary: SQL: co-located query may calculate target partition in advance in some
cases
                 Key: IGNITE-4510
                 URL: https://issues.apache.org/jira/browse/IGNITE-4510
             Project: Ignite
          Issue Type: Task
          Components: SQL
    Affects Versions: 1.8
            Reporter: Vladimir Ozerov
             Fix For: 2.0


Consider the following SQL query with {{distributedJoins=false}}:
{code}
SELECT ... 
FROM Employee e
    INNER JOIN Department d on d.id = e.dept_id
WHERE e.dept_id = ?
{code}

If {{dept_id}} is affinity key, and this should be certainly so in case of non-colocated joins
(otherwise query will return incorrect result), then we can do the following:
1) Determine partition for this affinity key.
2) Send query execution request to this partition only.

Same technique can be applied to {{WHERE e.dept_id IN (?, ...)}} case.



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