[jira] [Assigned] (IGNITE-14557) Improve row layout.

["Andrey Mashenkov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-14557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrey Mashenkov reassigned IGNITE-14557:
-----------------------------------------

    Assignee: Andrey Mashenkov

> Improve row layout.
> -------------------
>
>                 Key: IGNITE-14557
>                 URL: https://issues.apache.org/jira/browse/IGNITE-14557
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Andrey Mashenkov
>            Assignee: Andrey Mashenkov
>            Priority: Major
>              Labels: iep-54, ignite-3
>
> h3. Motivation.
> When one try to read a column value from a row, the very first check will be a null-check.
> As Null-Table resides right after an Offset-Table, the we need 2 jumps to for the null-check.
> h3. Description.
> Assuming, Null-Table reserves a bit for each columns even if the columns is not Nullable,
> Null-table has constant size (within same version of schema) and we no need extra bytes to persist it's length into the tuple.
>  * Null-checks will not require extra read for Offset-Table size and extra jump.
>  * Offset-Table will not need extra read/jump to reach as Null-Table size is constant.
> Let's just swap these tables in layout and fix docs README.md and IEP.
>  



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