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Posted to issues@ignite.apache.org by "Vladimir Ozerov (JIRA)" <ji...@apache.org> on 2017/11/13 07:46:01 UTC
[jira] [Assigned] (IGNITE-5937) Mvcc data structure for SQL queries
[ https://issues.apache.org/jira/browse/IGNITE-5937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vladimir Ozerov reassigned IGNITE-5937:
---------------------------------------
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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