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From "Alan Gates (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2406) Improve double precision
Date Fri, 09 Dec 2011 17:01:41 GMT

    [ https://issues.apache.org/jira/browse/PIG-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13166314#comment-13166314
] 

Alan Gates commented on PIG-2406:
---------------------------------

You could certainly contribute a UDF to Piggybank to do floating point math in BigDecimal.
 At one point we looked at moving entirely to BigDecimal, but it's about 10x slower than using
Double.
                
> Improve double precision 
> -------------------------
>
>                 Key: PIG-2406
>                 URL: https://issues.apache.org/jira/browse/PIG-2406
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Anitha Raju
>
> Hi,
> When 2.51 (type: double) is added 24 times using SUM, it gives you result of 60.23999999999997.

> If a user wants to control the precision, that is, in the result he requires 60.24, it
wouldnt be possible unless he implements a custom UDF.
> So if we can have a way to improve double precision, 
> for eg: http://docs.oracle.com/javase/1.5.0/docs/api/java/math/BigDecimal.html
> Here with BigDecimal, one can improve the double precision and with MathContext, the
user has control to set the precision.
> Can we have a new UDF which can do the same?
> Regards,
> Anitha

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