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https://issues.apache.org/jira/browse/IGNITE-6296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov closed IGNITE-6296.
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> 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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