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https://issues.apache.org/jira/browse/ARROW-12959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ARROW-12959:
-----------------------------------
Labels: pull-request-available (was: )
> [C++][R] Option for is_null(NaN) to evaluate to true
> ----------------------------------------------------
>
> Key: ARROW-12959
> URL: https://issues.apache.org/jira/browse/ARROW-12959
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, R
> Reporter: Ian Cook
> Assignee: Christian Cordova
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> (This is the flip side of ARROW-12960.)
> Currently the Arrow compute kernel {{is_null}} always treats {{NaN}} as a
> non-missing value, returning {{false}} at positions of the input datum with
> value {{NaN}}.
> It would be helpful to be able to control this behavior with an option. The
> option could be named {{nan_is_null}} or something similar. It would default
> to {{false}}, consistent with current behavior. When set to {{true}}, it
> should check if the input datum has a floating point data type, and if so,
> return {{true}} at positions where the input is {{NaN}}. If the input datum
> has some other type, the option should be silently ignored.
> Among other things, this would enable the {{arrow}} R package to evaluate
> {{is.na()}} consistently with the way base R does. In base R, {{is.na()}}
> returns {{TRUE}} on {{NaN}}. But in the {{arrow}} R package, it returns
> {{FALSE}}:
> {code:r}
> is.na(c(3.14, NA, NaN))
> ## [1] FALSE TRUE TRUE
> as.vector(is.na(Array$create(c(3.14, NA, NaN))))
> ## [1] FALSE TRUE FALSE{code}
> I think solving this with an option in the C++ kernel is the best solution,
> because I suspect there are other cases in which users might want to treat
> {{NaN}} as a missing value. However, it would also be possible to solve this
> just in the R package, by defining a mapping of {{is.na}} in the R package
> that checks if the input {{x}} has a floating point data type, and if so,
> evaluates {{is.na\(x\) | is.nan\(x\)}}. If we choose to go that route, we
> should change this Jira issue summary to "[R] Make is.na(NaN) consistent with
> base R".
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