gsserge commented on a change in pull request #1324:
URL: https://github.com/apache/arrow-rs/pull/1324#discussion_r808491994



##########
File path: arrow/src/csv/writer.rs
##########
@@ -97,6 +97,7 @@ pub struct Writer<W: Write> {
     /// The object to write to
     writer: csv_crate::Writer<W>,
     /// Column delimiter. Defaults to `b','`
+    #[allow(dead_code)]

Review comment:
       Yep, this time the delimiter is configured via the builder, but gets 
completely ignored
   ```rust
   impl<W: Write> Writer<W> {
       /// Create a new CsvWriter from a writable object, with default options
       pub fn new(writer: W) -> Self {
           let delimiter = b',';
           let mut builder = csv_crate::WriterBuilder::new();
           let writer = builder.delimiter(delimiter).from_writer(writer);
   ...
   ```




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