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https://issues.apache.org/jira/browse/ARROW-13886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17447412#comment-17447412
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Dragoș Moldovan-Grünfeld commented on ARROW-13886:
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We implement the R {{decimal()}} as a binding to {{{}Decimal128Type{}}}. This
means that the maximum precision it can deal with is 38 significant digits. I
think we should implement a check on precision <= 38 and offer an informative
message.
> [R] Expand documentation for decimal()
> --------------------------------------
>
> Key: ARROW-13886
> URL: https://issues.apache.org/jira/browse/ARROW-13886
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Nicola Crane
> Assignee: Dragoș Moldovan-Grünfeld
> Priority: Minor
> Labels: good-first-issue
>
> Two main things we could update here:
> # The general description of what the decimal type is and is for and/or a
> link to the C++ docs - in the details section, add some explanation of what
> an Arrow {{decimal()}} type is and why it is automatically mapped to an R
> {{double}} type
> # Documentation of the params precision and scale. We could add a bit more
> information to explain what that actually means to the user, as it's not
> immediately obvious.
>
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