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.
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.