code: def __str__(self):
      if self.value == RowKind.INSERT.value:
          return "+I"
      elif self.value == RowKind.UPDATE_BEFORE.value:
          return "-U"
      elif self.value == RowKind.UPDATE_AFTER.value:
          return "+U"
      else:
          return "-D"
  
imports: from enum import Enum
  from typing import List
  from pyflink.java_gateway import get_gateway
label_desc: Use image node_id 1 for calling the RowKind obj's underlying member method code with example usage: obj.__str__() and returns: str, str, str, str