catalog.rs has a RecordFormat which carries configuration, e.g. Csv(CsvParserConfig)
However, the RecordFormat is used for both input and output, as the doc says:

/// Descriptor that specifies the format in which records are received
/// or into which they should be encoded before sending.
#[derive(Clone)]
pub enum RecordFormat {

But CsvParserConfig is a parser configuration, it does not apply fully to the output side.
It should be called CsvConfig, or there should be separate configurations for Decoding and Encoding.

It is not clear that this can be easily changed without breaking backwards compatibility.