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From "Sergey Kalashnikov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-4509) SQL: query with condition on affinity columns and without joins and subqueries can be replaced with GET
Date Fri, 12 May 2017 08:47:04 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-4509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16007807#comment-16007807
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Sergey Kalashnikov commented on IGNITE-4509:
--------------------------------------------

[~sergi.vladykin], [~vozerov] Can you please review the changes?

> SQL: query with condition on affinity columns and without joins and subqueries can be
replaced with GET
> -------------------------------------------------------------------------------------------------------
>
>                 Key: IGNITE-4509
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4509
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>    Affects Versions: 1.8
>            Reporter: Vladimir Ozerov
>            Assignee: Sergey Kalashnikov
>              Labels: performance, sql
>             Fix For: 2.1
>
>
> Simple SQL queries usually demonstrate negative scalability when more nodes are added.

> Consider the following query:
> {code}
> SELECT * FROM Person p
> WHERE p.id = ?
> {code}
> If {{Person.id}} is affinity field, then query can be replaced with plain {{IgniteCache.get}}
or some specialized version of GET, which will return only desired fields. This optimization
will guarantee smooth scale with any number of nodes.



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