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https://issues.apache.org/jira/browse/ARROW-12291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17317552#comment-17317552
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Ian Cook commented on ARROW-12291:
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I wonder whether the function registry in the C++ library could be extended
with a function that could be called exactly like
{{arrow::compute::CallFunction}} but that would return the resultant data type
instead of the result itself (and would do so without actually running any
computations on the data).
> [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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