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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