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From "Shuxiong Ye (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-2020) Implement build-in math function EXP
Date Mon, 01 Jun 2015 16:34:17 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-2020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14567534#comment-14567534
] 

Shuxiong Ye commented on PHOENIX-2020:
--------------------------------------

The patch above will firstly turn input to double type, and using java.lang.Math related functions
to get the result.
Note that, for both types BigDecimal and long, when type cast occurs from these two types
to double, there will be a loss of precision.
java.lang.Math is only support for double.


> Implement build-in math function EXP
> ------------------------------------
>
>                 Key: PHOENIX-2020
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-2020
>             Project: Phoenix
>          Issue Type: Sub-task
>            Reporter: Shuxiong Ye
>            Assignee: Shuxiong Ye
>             Fix For: 5.0.0, 4.5.0, 4.4.1
>
>         Attachments: 0001-PHOENIX-2020-Implement-build-in-math-function-EXP.patch
>
>
> EXP is exponential function, and will be a special case of POWER function.
> Examples show as below:
> exp(dp)	exponential	exp(1.0)	2.71828182845905



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