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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (IGNITE-9480) SQL: Introduce H2 LocalResult factory
Date Fri, 15 Feb 2019 14:21:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-9480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov reassigned IGNITE-9480:
---------------------------------------

    Assignee:     (was: Taras Ledkov)

> SQL: Introduce H2 LocalResult factory
> -------------------------------------
>
>                 Key: IGNITE-9480
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9480
>             Project: Ignite
>          Issue Type: Improvement
>          Components: sql
>    Affects Versions: 2.6
>            Reporter: Taras Ledkov
>            Priority: Major
>             Fix For: 2.8
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> H2 collects query result at the instance of `LocalResult` for queries results that not
be gathered lazy. This causes an OOME error on large result sets.
> We have to introduce way to use our own implementation of the query result's container.
> Suggestion fix:
> - H2 simple refactoring: make `LocalResult` interface and H2 default implementation `LocalResultImpl`
> - Add H2 configurable `LocalResultFactory` to setup custom implementation of the `LocalResult.
> - Create Ignite implementation of `LocalResultFactory` & `LocalResult` to track allocated
memory, swap results to external storage etc.
> H2 issue: [#1405|https://github.com/h2database/h2database/issues/1405#issuecomment-417631253]



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