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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4822) implement vectorized math functions
Date Fri, 19 Jul 2013 23:10:48 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13714208#comment-13714208
] 

Brock Noland commented on HIVE-4822:
------------------------------------

[~ehans] as you can see the Precommit bot attempted to run tests on this patch but because
it doesn't apply on trunk if failed. Going forward you can either disable precommit tests
or name the patches appropriately so the pre-commit tests will run. More details can be found
here:

https://cwiki.apache.org/confluence/display/Hive/Hive+PreCommit+Patch+Testing

Or of course you can always shoot me an email.
                
> 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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