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https://issues.apache.org/jira/browse/ARROW-6003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16931757#comment-16931757
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Neal Richardson commented on ARROW-6003:
----------------------------------------
This is still the behavior in R. Slightly lower-level repro:
{code:r}
library(arrow)
tf <- tempfile()
# `iris` is a built-in dataset
write.table(iris, tf, sep = ",", row.names = FALSE, col.names = FALSE)
reader <- CsvTableReader$create(tf,
read_options=CsvReadOptions$create(column_names="just one name"))
reader$Read()
## Error in csv___TableReader__Read(self) : Invalid: Empty CSV file
{code}
That function is defined as
{code:cpp}
std::shared_ptr<arrow::Table> csv___TableReader__Read(
const std::shared_ptr<arrow::csv::TableReader>& table_reader) {
std::shared_ptr<arrow::Table> table;
STOP_IF_NOT_OK(table_reader->Read(&table));
return table;
}
{code}
And {{STOP_IF_NOT_OK}} is
{code:cpp}
#define STOP_IF_NOT(TEST, MSG) \
do { \
if (!(TEST)) Rcpp::stop(MSG); \
} while (0)
#define STOP_IF_NOT_OK(s) STOP_IF_NOT(s.ok(), s.ToString())
{code}
so assuming that your python code is doing essentially the same thing, maybe
the difference in R is that macro, i.e. the {{s.ToString()}} maybe is not
including the specific error message?
> [C++] Better input validation and error messaging in CSV reader
> ---------------------------------------------------------------
>
> Key: ARROW-6003
> URL: https://issues.apache.org/jira/browse/ARROW-6003
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Neal Richardson
> Assignee: Neal Richardson
> Priority: Major
> Labels: csv
>
> Followup to https://issues.apache.org/jira/browse/ARROW-5747. The error
> message(s) are not great when you give bad input. For example, if I give too
> many or too few {{column_names}}, the error I get is {{Invalid: Empty CSV
> file}}. In fact, that's about the only error message I've seen from the CSV
> reader, no matter what I've thrown at it.
> It would be better if error messages were more specific so that I as a user
> might know how to fix my bad input.
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