Vladimir Ozerov created IGNITE-4510:
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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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