[jira] [Updated] (IGNITE-4510) SQL: co-located query may calculate target partition in advance in some cases

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-4510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-4510:
------------------------------------
    Labels: sql-performance  (was: performance)

> 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
>            Priority: Major
>              Labels: sql-performance
>
> 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.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)