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https://issues.apache.org/jira/browse/IGNITE-6407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov updated IGNITE-6407:
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Summary: SQL: CREATE INDEX command should build index bottom-up (was: SQL:
{{CREATE INDEX}} command should build index bottom-up)
> 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
> Labels: iep-1, 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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