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Date: Fri, 19 Jul 2013 19:34:51 +0000 (UTC)
From: "Eric Hanson (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12656704.1373319549115.83049.1374262491753@arcas>
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Subject: [jira] [Commented] (HIVE-4822) implement vectorized math functions
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    [ https://issues.apache.org/jira/browse/HIVE-4822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713993#comment-13713993 ] 

Eric Hanson commented on HIVE-4822:
-----------------------------------

Also, pmod() is not included in this patch, because it is already implemented as the existing VectorExpression classes for Modulo (%).
                
> implement vectorized math functions
> -----------------------------------
>
>                 Key: HIVE-4822
>                 URL: https://issues.apache.org/jira/browse/HIVE-4822
>             Project: Hive
>          Issue Type: Sub-task
>    Affects Versions: vectorization-branch
>            Reporter: Eric Hanson
>            Assignee: Eric Hanson
>             Fix For: vectorization-branch
>
>         Attachments: HIVE-4822.1.patch, HIVE-4822.4.patch
>
>
> Implement vectorized support for the all the built-in math functions. This includes implementing the vectorized operation, and tying it all together in VectorizationContext so it runs end-to-end. These functions include:
> round(Col)
> Round(Col, N)
> Floor(Col)
> Ceil(Col)
> Rand(), Rand(seed)
> Exp(Col)
> Ln(Col)
> Log10(Col)
> Log2(Col)
> Log(base, Col)
> Pow(col, p), Power(col, p)
> Sqrt(Col)
> Bin(Col)
> Hex(Col)
> Unhex(Col)
> Conv(Col, from_base, to_base)
> Abs(Col)
> Pmod(arg1, arg2)
> Sin(Col)
> Asin(Col)
> Cos(Col)
> ACos(Col)
> Atan(Col)
> Degrees(Col)
> Radians(Col)
> Positive(Col)
> Negative(Col)
> Sign(Col)
> E()
> Pi()
> To reduce the total code volume, do an implicit type cast from non-double input types to double. 
> Also, POSITITVE and NEGATIVE are syntactic sugar for unary + and unary -, so reuse code for those as appropriate.
> Try to call the function directly in the inner loop and avoid new() or expensive operations, as appropriate.
> Templatize the code where appropriate, e.g. all the unary function of form 
> DOUBLE func(DOUBLE)
> can probably be done with a template.

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