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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (IGNITE-9616) SQL: Introduce H2 factory for holder of aggregate result
Date Fri, 15 Feb 2019 14:21:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-9616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov reassigned IGNITE-9616:
---------------------------------------

    Assignee:     (was: Taras Ledkov)

> SQL: Introduce H2 factory for holder of aggregate result
> --------------------------------------------------------
>
>                 Key: IGNITE-9616
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9616
>             Project: Ignite
>          Issue Type: Improvement
>          Components: sql
>    Affects Versions: 2.6
>            Reporter: Taras Ledkov
>            Priority: Major
>
> H2 collects aggregate results at the simple HashMap (groups set and values set).
> This causes an OOME error on large groups set and large group size with {{DISTINCT}}.
> We have to introduce way to use our own implementation of the aggregate result's container.
> H2 issue: [#1433|https://github.com/h2database/h2database/issues/1433#issuecomment-421045128]



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