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https://issues.apache.org/jira/browse/ARROW-13370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17456541#comment-17456541
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Jonathan Keane commented on ARROW-13370:
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This might be better as a separate issue, but we also could improve our not
implemented messages that helps narrow down what has gone wrong.
For example {{mutate(col = ifelse(col %in% unique(table$var), ...)}} will fail
not because of `ifelse` but because of unique, but we reference the whole
expression:
{code}
Error: Expression ifelse(col %in% unique(df$other_col), ... not supported in
Arrow
Call collect() first to pull data into R.
{code}
Which can lead folks to think that {{ifelse}} doesn't work, when really it's
the {{unique()}} bit (which for this isn't even needed)
> [R] More special handling for known errors in arrow_eval
> --------------------------------------------------------
>
> Key: ARROW-13370
> URL: https://issues.apache.org/jira/browse/ARROW-13370
> Project: Apache Arrow
> Issue Type: New Feature
> Components: R
> Reporter: Neal Richardson
> Priority: Major
> Fix For: 7.0.0
>
>
> We have special handling in arrow_eval that looks for the "not supported in
> Arrow" error, and when that's found it shows the error message rather than
> swallowing it in an "Expression not supported" message. But we have other
> error messages we raise in nse_funcs that are worth showing--bad input etc.
> Use a sentinel error message that we can also detect and subclass as
> "arrow-try-error" like the others, or (better) raised a classed exception (if
> that's supported in all versions of R we support).
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