当前代码为：

schema.fields.foreach(f => {
                            // check if schema field is type of array 
                            // if yes then throw array not supported 
                             if (f.dataType.typeName == "array") {
 throw ArrayDataTypeNotSupportedException(s"${f.name} column is ArrayType, " +
                                  "writing arrays to CSV isn't supported. Please convert this column to a different data type.")
                             }
                            })

但现在我想要这样的情况，如果schema.field.typename是字符串数组或字符串数组，那么字符串数组应该转换为逗号分隔的字符串。如果它不是字符串数组，则抛出array not accepted异常。简言之，我只想支持字符串数组，而不支持其他数组。如果字符串数组之外有任何东西，那么我想传递下面的异常

throw ArrayDataTypeNotSupportedException(s"${f.name} column is ArrayType, " +
                                      "writing arrays to CSV isn't supported. Please convert this column to a different data type.")