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https://issues.apache.org/jira/browse/CARBONDATA-3680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Indhumathi Muthumurugesh updated CARBONDATA-3680:
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Attachment: SI doc.pdf
> Support secondary index on carbon table
> ---------------------------------------
>
> Key: CARBONDATA-3680
> URL:
https://issues.apache.org/jira/browse/CARBONDATA-3680> Project: CarbonData
> Issue Type: New Feature
> Reporter: Indhumathi Muthumurugesh
> Priority: Major
> Attachments: SI doc.pdf
>
>
> Currently we have datamaps like, *default datamaps* which are block and blocklet and *coarse grained datamaps* like bloom, and *fine grained datamaps* like lucene
> which helps in better pruning during query. What if we introduce another kind of datamap which can hold blockletId as index? Initial level, we call it as index which
> will work as a child table to the main table like we have MV in our current code.
> Yes, lets introduce the secondary index to carbon table which will be the child table to main table and it can be created on column like we create lucene datamap,
> where we give index columns to create index. In a similar way, we create secondary index on column, so indexes on these column will be blocklet IDs which will
> help in better pruning and faster query when we have a filter query on the index column.
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