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Posted to issues@ignite.apache.org by "Vladimir Ozerov (JIRA)" <ji...@apache.org> on 2017/10/23 10:54:00 UTC

[jira] [Updated] (IGNITE-6703) Unnecessary lookup in BPlusTree.ForwardCursor.fillFromBuffer for startIdx 0

     [ https://issues.apache.org/jira/browse/IGNITE-6703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-6703:
------------------------------------
    Labels: performance  (was: )

> Unnecessary lookup in BPlusTree.ForwardCursor.fillFromBuffer for startIdx 0
> ---------------------------------------------------------------------------
>
>                 Key: IGNITE-6703
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6703
>             Project: Ignite
>          Issue Type: Improvement
>      Security Level: Public(Viewable by anyone) 
>          Components: sql
>            Reporter: Semen Boikov
>              Labels: performance
>
> fillFromBuffer calls findLowerBound if passed startIdx=0, BPlusTree.ForwardCursor.fillFromBuffer can be called in 2 cases:
> 1. When lower bound is not known
> 2. When lower bound is found in BPlusTree.Search. It seems in this case 0 is valid value for startIdx and findLowerBound is not needed in this case.
> I it possible for example to change findLowerBound's contract and use -1 as 'unknown startIdx' value.



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