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From "Indhumathi Muthumurugesh (Jira)" <>
Subject [jira] [Updated] (CARBONDATA-3680) Support secondary index on carbon table
Date Thu, 06 Feb 2020 05:24:00 GMT


Indhumathi Muthumurugesh updated CARBONDATA-3680:
    Attachment: Secondary Index.pdf

> Support secondary index on carbon table
> ---------------------------------------
>                 Key: CARBONDATA-3680
>                 URL:
>             Project: CarbonData
>          Issue Type: New Feature
>            Reporter: Indhumathi Muthumurugesh
>            Priority: Major
>         Attachments: Secondary Index.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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