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Posted to dev@tajo.apache.org by "Jae Young Lee (JIRA)" <ji...@apache.org> on 2013/12/06 07:47:36 UTC

[jira] [Updated] (TAJO-386) Implement logarithm

     [ https://issues.apache.org/jira/browse/TAJO-386?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jae Young Lee updated TAJO-386:
-------------------------------

    Description: 
- Implement 4 logarithm functions below: 

ln (x) - Returns the natural logarithm of x
log ([b], x) - Returns the logarithm of x with base b
log10 (x) - Returns the logarithm of x with base 10
log2 (x) - Returns the logarithm of x with base 2

  was:
- Implement 4 logarithm functions below: 

ln(x) - Returns the natural logarithm of x
log([b], x) - Returns the logarithm of x with base b
log10(x) - Returns the logarithm of x with base 10
log2(x) - Returns the logarithm of x with base 2


> Implement logarithm 
> --------------------
>
>                 Key: TAJO-386
>                 URL: https://issues.apache.org/jira/browse/TAJO-386
>             Project: Tajo
>          Issue Type: Sub-task
>          Components: operator/function/udf
>            Reporter: Jae Young Lee
>            Assignee: Jae Young Lee
>            Priority: Minor
>
> - Implement 4 logarithm functions below: 
> ln (x) - Returns the natural logarithm of x
> log ([b], x) - Returns the logarithm of x with base b
> log10 (x) - Returns the logarithm of x with base 10
> log2 (x) - Returns the logarithm of x with base 2



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