private List<String> formatFields(String... fields) {
        List<String> formatFields = new ArrayList<>(fields.length);
        for (String field : fields) {
            if (!field.contains("`")) {
                formatFields.add(String.format("`%s`", field.trim()));
            } else {
                formatFields.add(field);
            }
        }
        return formatFields;
    }
Format fields with '`'

@param fields The fields that need format
@return list of field after format
inlong-sort/sort-core/src/main/java/org/apache/inlong/sort/parser/impl/FlinkSqlParser.java