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https://issues.apache.org/jira/browse/ARROW-8956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17117041#comment-17117041
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Neal Richardson commented on ARROW-8956:
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Wouldn't it make more sense (for some mental model of what missing data is) for
them both to return null instead?
{code}
$ R
> NA == NA
[1] NA
> NaN == NaN
[1] NA
{code}
> [C++] arrow::ScalarEquals returns false when values are both null
> -----------------------------------------------------------------
>
> Key: ARROW-8956
> URL: https://issues.apache.org/jira/browse/ARROW-8956
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
>
> I wasn't sure if this was deliberate but it appeared while writing unit tests
> and so wanted to check what was the intention before changing it. Arrays
> compare equal when null slots are respectively null so this seems
> inconsistent.
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