[jira] [Closed] (IGNITE-6407) SQL: CREATE INDEX command should build index bottom-up

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

     [ https://issues.apache.org/jira/browse/IGNITE-6407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov closed IGNITE-6407.
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> SQL: CREATE INDEX command should build index bottom-up
> ------------------------------------------------------
>
>                 Key: IGNITE-6407
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6407
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>    Affects Versions: 2.1
>            Reporter: Vladimir Ozerov
>            Priority: Major
>              Labels: iep-19, performance
>
> Currently when {{CREATE INDEX}} command is executed, entires are added to index one-by-one. This leads to high index build times. 
> Instead, we can build index as follows:
> 1) Iterate over the whole data set and sort it according to index rules
> 2) Build leaf pages 
> 3) Build middle pages
> 4) Build root page
> This approach is used by many vendors. The main difficulty is that the whole data set may not fit to memory. For this reason we will need to implement a kind of disk spilling. 



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