[jira] [Commented] (CARBONDATA-4150) Information about indexed datamap

["Mahesh Raju Somalaraju (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CARBONDATA-4150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17303630#comment-17303630 ] 

Mahesh Raju Somalaraju commented on CARBONDATA-4150:
----------------------------------------------------

Hi Suyash Yadhav,

Index datamap is a data structure that can be used to accelerate certain query of the table. Currently, Carbondata supports three types of Indexes:
 # *BloomFilter Index*: A space-efficient probabilistic data structure that is used to test whether an element is a member of a set.
 # *Lucene Index*: High performance, full-featured text search engine.
 # *Secondary Index[SI]*:  Secondary index tables are created as indexes and managed as child tables internally by Carbondata. Users can create a secondary index based on the column position in the main table(Recommended for right columns) and the queries should have filter on that column to improve the filter query performance. Secondary index tables to hold blocklets are created as indexes and managed as child tables internally by Carbondata.

you can refer to the below link for detail info about usage. Hope this helps, if any further info please reply back! 

[https://github.com/apache/carbondata/blob/master/docs/index/bloomfilter-index-guide.md]

[https://github.com/apache/carbondata/blob/master/docs/index/lucene-index-guide.md]

[https://github.com/apache/carbondata/blob/master/docs/index/secondary-index-guide.md]

 

Thanks & Regards

Mahesh Raju S

> Information about indexed datamap
> ---------------------------------
>
>                 Key: CARBONDATA-4150
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-4150
>             Project: CarbonData
>          Issue Type: Wish
>          Components: core
>    Affects Versions: 2.0.1
>         Environment: apache 2.0.1 spark 2.4.5 hadoop 2.7.2
>            Reporter: suyash yadav
>            Priority: Critical
>             Fix For: 2.0.1
>
>
> Hi Team,
>  
> We would like to know detailed information about indexed datamap and possible use cases for this datamap.
> So please help us in getting answer to below queries:-
>  
> 1) What is an indexed datamap and related use cases.
> 2) how it is to be used,
> 3) any reference documents
>  
>  
>  



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