Semen Boikov created IGNITE-5937:
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Summary: Mvcc data structure for SQL queries
Key: IGNITE-5937
URL: https://issues.apache.org/jira/browse/IGNITE-5937
Project: Ignite
Issue Type: Sub-task
Reporter: Semen Boikov
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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