[jira] [Commented] (ARROW-12744) [C++][Compute] Add rounding kernel

["Eduardo Ponce (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-12744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17369415#comment-17369415 ] 

Eduardo Ponce commented on ARROW-12744:
---------------------------------------

A draft PR is available that implements *round* function as a unary scalar function. It outputs float64 for integral inputs and matching type for floating-point inputs.

Rounding behavior is controlled via 2 option controls, a rounding mode (specifies displacement behavior) and a multiple (scale and precision).

Feedback is welcomed w.r.t. to implementation, rounding options and names, and documentation.

> [C++][Compute] Add rounding kernel
> ----------------------------------
>
>                 Key: ARROW-12744
>                 URL: https://issues.apache.org/jira/browse/ARROW-12744
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Ian Cook
>            Assignee: Eduardo Ponce
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> Kernel to round an array of floating point numbers. Should return an array of the same type as the input. Should have an option to control how many digits after the decimal point (default value 0 meaning round to the nearest integer).
> Midpoint values (e.g. 0.5 rounded to nearest integer) should round away from zero (up for positive numbers, down for negative numbers).



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