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https://issues.apache.org/jira/browse/ARROW-12291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17317357#comment-17317357
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Neal Richardson commented on ARROW-12291:
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I think this just isn't knowable from R without evaluating the expressions, or
otherwise reimplementing the C++ kernel logic.
> [R] Determine the type of an unevaluated expression
> ---------------------------------------------------
>
> Key: ARROW-12291
> URL: https://issues.apache.org/jira/browse/ARROW-12291
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Ian Cook
> Priority: Major
>
> There would be several benefits to knowing the data type of an expression
> before its value has actually been computed. Probably the greatest benefit
> would be that other expressions could then behave dynamically based on the
> data types of their inputs. Consider how this capability might be implemented.
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