[jira] [Commented] (IGNITE-8384) SQL: Secondary indexes should sort entries by links rather than keys

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-8384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16457527#comment-16457527 ] 

Vladimir Ozerov commented on IGNITE-8384:
-----------------------------------------

Starting point: {{org.apache.ignite.internal.processors.query.h2.database.H2Tree#compare}}

> SQL: Secondary indexes should sort entries by links rather than keys
> --------------------------------------------------------------------
>
>                 Key: IGNITE-8384
>                 URL: https://issues.apache.org/jira/browse/IGNITE-8384
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>    Affects Versions: 2.4
>            Reporter: Vladimir Ozerov
>            Priority: Major
>              Labels: iep-19, performance
>             Fix For: 2.6
>
>
> Currently we sort entries in secondary indexes as {{(idx_cols, KEY)}}. The key itself is not stored in the index in general case. It means that we need to perform a lookup to data page to find correct insertion point for index entry.
> This could be fixed easily by sorting entries a bit differently - {{idx_cols, link}}. This is all we need.



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