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https://issues.apache.org/jira/browse/IGNITE-5937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov reassigned IGNITE-5937:
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Assignee: Semen Boikov
> Mvcc data structure for SQL queries
> -----------------------------------
>
> Key: IGNITE-5937
> URL: https://issues.apache.org/jira/browse/IGNITE-5937
> Project: Ignite
> Issue Type: Task
> Components: sql
> Reporter: Semen Boikov
> Assignee: Semen Boikov
> Fix For: 2.4
>
>
> Need implement some data structure to store/query multiple entry versions.
> One possible option:
> - committed value at first is stored in separate BPlusTree index (there also
> need store related tx id to filter out data for non-finished transactions)
> - periodically flush data for finished transaction in 'main' index
> - for SQL queries need merge result from main index and filtered 'mvcc'
> index. Note: it is possible 'mvcc' index will contain multiple committed
> versions of the same entry, need make sure only one last one will appear in
> result.
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