[jira] [Commented] (CASSANDRA-7637) Add CQL3 keyword for efficient lexical range queries (e.g. START_WITH)

["Sunil Kumar Singh (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-7637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14151407#comment-14151407 ] 

Sunil Kumar Singh commented on CASSANDRA-7637:
----------------------------------------------

I have started to looking into this Issue once understand & I will mark it as In Progress. If any more suggestion on requirement, Please make it clear.  

> Add CQL3 keyword for efficient lexical range queries (e.g. START_WITH)
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-7637
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7637
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API
>            Reporter: Rustam Aliyev
>            Assignee: Sunil Kumar Singh
>             Fix For: 3.0
>
>
> Currently, if I want to perform range query on lexical type I need to do something like this:
> {code}
> SELECT * FROM profile WHERE profile_id = 123 AND
>                   attribute > 'interests.food.' AND
>                   attribute < 'interests.food.z';
> {code}
> This is very efficient range query. Yet, many users who are not familiar with Thrift and storage level implementation are unaware of this "trick".
> Therefore, it would be convenient to introduce CQL keyword which will do this more simply:
> {code}
> SELECT * FROM profile WHERE profile_id = 123 AND
>                   attribute START_WITH('interests.food.');
> {code}
> Keyword would have same restrictions as other inequality search operators plus some type restrictions.
> Allowed types would be:
>  * {{ascii}}
>  * {{text}} / {{varchar}}
>  * {{map<text, *>}} (same for ascii) (?)
>  * {{set<text>}} (same for ascii) (?)
> (?) may require more work, therefore optional



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