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https://issues.apache.org/jira/browse/IGNITE-9616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16620601#comment-16620601
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Taras Ledkov commented on IGNITE-9616:
--------------------------------------
[~vozerov], the [draft of the
patch|https://github.com/h2database/h2database/pull/1458] is provided to review
by H2 commiters.
> 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
> Assignee: 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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