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https://issues.apache.org/jira/browse/ARROW-14902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dragoș Moldovan-Grünfeld reassigned ARROW-14902:
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Assignee: Dragoș Moldovan-Grünfeld
> [R] Update write_csv_arrow() to support all args of readr::write_csv()
> ----------------------------------------------------------------------
>
> Key: ARROW-14902
> URL: https://issues.apache.org/jira/browse/ARROW-14902
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Dragoș Moldovan-Grünfeld
> Assignee: Dragoș Moldovan-Grünfeld
> Priority: Major
>
> Currently (arrow version 6.0.1 and readr version 2.1.0) we only support a few
> of the {{readr::write_csv()}} arguments. Once ARROW-13623 is fixed
> {{write_csv_arrow()}} will error if the user passes unsupported {{readr}}
> arguments.
> The following arguments need CsvWriteOptions (see linked issues) in order to
> be exposed to R users:
> * {{{}na{}}}: string used for missing values. Defaults to {{{}NA{}}}.
> Missing values are never quoted; strings with the same value as {{na}} will
> always be quoted.
> * {{{}append{}}}: boolean. If \{[FALSE}} will overwrite existing file. If
> {{TRUE}} will append to existing file. In both cases, if the file doesn't
> exist, a new file is created.
> * {{{}quote{}}}: how to handle fields which contain characters that need to
> be quoted:
> ** {{{}needed{}}}: only quote fields which need them
> ** {{{}all{}}}: quote all fields - I think this might be the implicit
> default behaviour for `write_csv_arrow()`
> ** {{{}none{}}}: never quote fields
> * {{{}escape{}}}: the type of escape to use when quotes are in the data:
> ** {{{}double{}}}: quotes are escaped by doubling them
> ** {{{}backslash{}}}: quotes are escaped by a preceding backslash
> ** {{{}none{}}}: quotes are not escaped
> * {{{}eol{}}}: the end of line character to use. Most commonly either "\n"
> for Unix style newlines, or "\r\n" for Windows style newlines.
>
> Once these are enabled, update the signature of `write_csv_arrow()` and
> compare written files.
> From ARROW-13623 "I noticed we had a difference in quoting: readr doesn't
> quote strings by default but we do." Once we have more control over quoting,
> we could write some tests to make sure default behaviours between
> {{write_csv_arrow() and {{readr::write_csv()}}}} match.
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