GravityView DataTables: How to change the CSV file field separator

gistfile1.php

<?php

/**
 * Change the field separator when exporting a DataTable view into a CSV file
 * Replace MY_FIELD_SEPARATOR by the new separator character like '|' or ';'
 */

function my_gv_datatables_csv_export_separator( $config, $view_id ) {
	if( empty( $config['tableTools']['aButtons'] ) ) {
		return $config;
	}

	foreach ( $config['tableTools']['aButtons'] as &$button ) {
		if( 'csv' == $button['sExtends'] ) {
			$button['sFieldSeperator'] = 'MY_FIELD_SEPARATOR';
		}
	}

	return $config;
}

add_filter( 'gravityview_datatables_js_options', 'my_gv_datatables_csv_export_separator', 20, 2 );