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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-6945) SQL: optionally do not copy offheap rows for local SqlQuery
Date Tue, 12 Dec 2017 13:24:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-6945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov updated IGNITE-6945:
------------------------------------
    Fix Version/s:     (was: 2.4)

> SQL: optionally do not copy offheap rows for local SqlQuery
> -----------------------------------------------------------
>
>                 Key: IGNITE-6945
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6945
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>            Reporter: Vladimir Ozerov
>            Assignee: Taras Ledkov
>
> Currently when iterating over rows we eagerly materialize them [1]. If key or value are
large enough, we could loose a lot of time on offheap-heap copying. To partially mitigate
this, we can do the following:
> 1) Add new flag {{SqlQuery.localNoCopy}} which is applicable only for local queries.
> 2) When enabled we will not copy final {{_KEY}} and {{_VAL}} columns to heap. but rather
wrap them into {{BinaryOffheapObjectImpl}}
> 3) These rows must be released when query iterator switches to the next row.
> [1] {{H2RowFactory.getRow}}



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