[jira] [Commented] (ARROW-11070) [C++] Implement power / exponentiation compute kernel

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-11070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17298945#comment-17298945 ] 

Joris Van den Bossche commented on ARROW-11070:
-----------------------------------------------

Copying my note about null behaviour from ARROW-11871:

One behavioural aspect that has come up in pandas is the question about what to do with nulls in case of {{power(null, 0)}} or {{power(1, null)}}: propagate the null value (as is otherwise always done for element-wise arithmetic operations), or in this case return an actual result (1 in both cases, in the idea that whathever value the null might represent, the result is always 1). Reference to the pandas issue: https://github.com/pandas-dev/pandas/issues/29997. It seems that eg R (return 1) and SQL (propagate null) have different behaviour on this aspect. So if we want to support both use cases, an option to switch might be needed.

> [C++] Implement power / exponentiation compute kernel
> -----------------------------------------------------
>
>                 Key: ARROW-11070
>                 URL: https://issues.apache.org/jira/browse/ARROW-11070
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++, R
>    Affects Versions: 2.0.0
>            Reporter: Jonathan Keane
>            Assignee: Michal Nowakiewicz
>            Priority: Major
>              Labels: compute
>             Fix For: 4.0.0
>
>
> We have addition, subtraction, multiplication, and division. 



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