Update dumpling-overview.md

dumpling-overview.md

@@ -404,6 +404,7 @@ SET GLOBAL tidb_gc_life_time = '10m';
 | `--csv-separator`            | Separator of each value in CSV files. It is not recommended to use the default ','. It is recommended to use '\|+\|' or other uncommon character combinations| ','                                                                                                                                                                                                                                                                                               | ','                                        |
 | `--csv-null-value`           | Representation of null values in CSV files                                                                                                                                                                                                                                                                                         | "\\N"                                      |
 | `--csv-line-terminator`      | The terminator at the end of a line for CSV files. When exporting data to a CSV file, you can specify the desired terminator with this option. This option supports "\\r\\n" and "\\n". The default value is "\\r\\n", which is consistent with the earlier versions. Because quotes in bash have different escaping rules, if you want to specify LF (linefeed) as a terminator, you can use a syntax similar to `--csv-line-terminator $'\n'`. | "\\r\\n" |
+| `--csv-output-dialect`          | CSV files do not support binary data types. To export binary data to CSV files, set the parameter to 'redshift'. This will represent binary data in hexadecimal format, but the '0x' prefix will be omitted, such as '0x61' being represented as '61'.                                                                                                                                                                                                                                                                  | ""                                      |
 | `--escape-backslash`         | Use backslash (`\`) to escape special characters in the export file                                                                                                                                                                                                                                                                | true                                       |
 | `--output-filename-template` | The filename templates represented in the format of [golang template](https://golang.org/pkg/text/template/#hdr-Arguments) <br/> Support the `{{.DB}}`, `{{.Table}}`, and `{{.Index}}` arguments <br/> The three arguments represent the database name, table name, and chunk ID of the data file                                  | `{{.DB}}.{{.Table}}.{{.Index}}`            |
 | `--status-addr`              | Dumpling's service address, including the address for Prometheus to pull metrics and pprof debugging                                                                                                                                                                                                                               | ":8281"                                    |