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https://issues.apache.org/jira/browse/ARROW-17458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17584853#comment-17584853
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Jonathan Keane commented on ARROW-17458:
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We ran into this issue today as well, working on conversions for benchmarking
datasets
> [C++] CSV Writer: Unsupported cast from decimal to utf8
> --------------------------------------------------------
>
> Key: ARROW-17458
> URL: https://issues.apache.org/jira/browse/ARROW-17458
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 6.0.1
> Reporter: Pavel Kovalenko
> Priority: Major
> Labels: csv, decimal, unsupported
>
> The following code snippet fails with an Unsupported cast error if a table
> has a decimal column.
> {code:cpp}
> std::shared_ptr<arrow::Table> table;
> ARROW_CHECK_OK(reader->ReadAll(&table));
> std::shared_ptr<arrow::io::OutputStream> output =
> arrow::io::FileOutputStream::Open(csvPath).ValueOrDie();
> auto writeOptions = arrow::csv::WriteOptions::Defaults();
> writeOptions.include_header = false;
> auto status = arrow::csv::WriteCSV(*table, writeOptions, output.get());
> if (!status.ok()) {
> SETHROW_ERROR(std::runtime_error, "Couldn't write table csv: {}",
> status.message());
> }
> {code}
> {code:cpp}
> Unsupported cast from decimal128(7, 2) to utf8 using function cast_string
> {code}
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