[ https://issues.apache.org/jira/browse/IGNITE-14557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17339694#comment-17339694 ]
Konstantin Orlov commented on IGNITE-14557: ------------------------------------------- Hi, [~amashenkov], I left a few minor comments. Please see PR. > 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 > Time Spent: 10m > Remaining Estimate: 0h > > 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. > -- This message was sent by Atlassian Jira (v8.3.4#803005)