[jira] [Created] (IGNITE-14557) Imrove row layout.

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

Andrey Mashenkov created IGNITE-14557:
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             Summary: Imrove row layout.
                 Key: IGNITE-14557
                 URL: https://issues.apache.org/jira/browse/IGNITE-14557
             Project: Ignite
          Issue Type: Improvement
            Reporter: Andrey Mashenkov


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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