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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (IGNITE-6296) SQL: Get rid of "collocated" flag
Date Thu, 14 Feb 2019 08:42:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-6296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov resolved IGNITE-6296.
-------------------------------------
    Resolution: Won't Fix

Will be fixed in the scope of global splitter redesign activity. Closing for now.

> SQL: Get rid of "collocated" flag
> ---------------------------------
>
>                 Key: IGNITE-6296
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6296
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>    Affects Versions: 2.1
>            Reporter: Vladimir Ozerov
>            Priority: Major
>              Labels: usability
>
> This flag forces our execution engine to perform aggregations on mapper nodes rather
than on reducer. 
> First, we already have enough information in runtime to decide whether we can optimize
or not. Second, if query is complex enough, users would have hard time trying to figure whether
query would return correct result or not. We should never ever return invalid results.
> Let's make our engine smarter, so that it is able to determine whether such grouping
is safe or not and then deprecate that flag.



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