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https://issues.apache.org/jira/browse/ARROW-13117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ian Cook resolved ARROW-13117.
------------------------------
Resolution: Fixed
Issue resolved by pull request 10563
[https://github.com/apache/arrow/pull/10563]
> [R] Retain schema in new Expressions
> ------------------------------------
>
> Key: ARROW-13117
> URL: https://issues.apache.org/jira/browse/ARROW-13117
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Ian Cook
> Assignee: Ian Cook
> Priority: Major
> Labels: pull-request-available
> Fix For: 5.0.0
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> When a new Expression is created, {{schema}} should be retained from the
> expression(s) it was created from. That way, the {{type()}} and {{type_id()}}
> methods of the new Expression will work. For example, currently this happens:
> {code:r}
> > x <- Expression$field_ref("x")
> > x$schema <- Schema$create(x = int32())
> >
> > y <- Expression$field_ref("y")
> > y$schema <- Schema$create(y = int32())
> >
> > Expression$create("add_checked", x, y)$type()
> Error: !is.null(schema) is not TRUE {code}
> This is what we want to happen:
> {code:r}
> > Expression$create("add_checked", x, y)$type()
> Int32
> int32
> {code}
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