[jira] [Commented] (CASSANDRA-17221) Add Math functions

["Simon Chess (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-17221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17531014#comment-17531014 ] 

Simon Chess commented on CASSANDRA-17221:
-----------------------------------------

[~e.dimitrova] just to be clear we're both talking about [https://github.com/xvade/cassandra|https://github.com/xvade/cassandra], right? I just fetched and merged so it should be up to date now. 

> Add Math functions 
> -------------------
>
>                 Key: CASSANDRA-17221
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17221
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL/Syntax
>            Reporter: Benjamin Lerer
>            Assignee: Simon Chess
>            Priority: Normal
>              Labels: AdventCalendar2021, lhf
>             Fix For: 4.x
>
>
> We should add native Maths functions for the most common operations:
> * {{abs\(x)}} returns the absolute value of the x
> * {{exp\(x)}} returns the value of e (the base of natural logarithms) raised to the power of x
> * {{log\(x)}} returns the natural logarithm (base e) of x
> * {{log10\(x)}} returns the base-10 logarithm of x
> * {{round\(x)}} returns the closest integer to x
> +Additional information for newcomers:+
> The new functions should be put in a new class {{MathFcts}} similar to {{TimeFcts}}.
> The {{MathsFcts.all()}} method should be called in {{SystemKeyspace.functions}}
> The unit tests for the functions should be put in a {{MathFctsTest}} similar to {{TimeFctsTest}} 



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