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https://issues.apache.org/jira/browse/ARROW-11871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17297453#comment-17297453
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ARF edited comment on ARROW-11871 at 3/8/21, 3:20 PM:
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[~jorisvandenbossche] For what it's worth, in my book {{null != 0}}. To me
{{null}} has absolutely nothing to do with the value {{0}}. To me {{null}}
indicates an invalid or non-existent value and the name {{null}} is merely a
(maybe unfortunate) historical artifact.
As a consequence in my opinion, the following should hold: {{power(null, 0) ==
null}} as well as {{power(1, null) == null}}.
I read this as: (either) one of two operands of a binary operator is invalid
or missing, hence the result is invalid or missing as well.
With this convention, if a user wants a different behaviour they can always use
{{fill_null(0)}} to ensure that {{power(fill_null(null, 0), 0) == 1}} and
{{power(1, fill_null(null, 0)) == 1}}. The converse is not true.
Also, I believe explicit is better than implicit...
was (Author: arf1):
[~jorisvandenbossche] For what it's worth, in my book {{null != 0}}. To me
{{null}} has absolutely nothing to do with the value {{0}}. To me {{null}}
indicates an invalid or non-existent value and the name {{null}} is merely a
(maybe unfortunate) historical artifact.
As a consequence in my opinion, the following should hold: {{power(null, 0) ==
null}} as well as {{power(1, null) == null}}.
I read this as: (either) one of two function inputs is invalid or missing,
hence the result is invalid or missing as well.
With this convention, if a user wants a different behaviour they can always use
{{fill_null(0)}} to ensure that {{power(fill_null(null, 0), 0) == 1}} and
{{power(1, fill_null(null, 0)) == 1}}. The converse is not true.
Also, I believe explicit is better than implicit...
> [C++] Add element-wise power() compute function
> -----------------------------------------------
>
> Key: ARROW-11871
> URL: https://issues.apache.org/jira/browse/ARROW-11871
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 3.0.0
> Reporter: ARF
> Priority: Minor
>
> It would be nice to have an element-wise {{power()}} compute function.
> I.e. in analogy to
> [numpy.power()|https://numpy.org/doc/stable/reference/generated/numpy.power.html].
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