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Posted to issues@ignite.apache.org by "Vladimir Ozerov (JIRA)" <ji...@apache.org> on 2016/12/29 09:42:58 UTC
[jira] [Updated] (IGNITE-4509) SQL: query with condition on
affinity columns and without joins and subqueries can be replaced with GET
[ https://issues.apache.org/jira/browse/IGNITE-4509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vladimir Ozerov updated IGNITE-4509:
------------------------------------
Labels: performance sql (was: sql)
> 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
> Labels: performance, sql
> Fix For: 2.0
>
>
> 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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