code: def get_impl(self):
      if isinstance(self._internal_coder, LengthPrefixBaseCoder):
          return FlinkLengthPrefixCoderBeamWrapper(self._create_impl())
      else:
          return FlinkFieldCoderBeamWrapper(self._create_impl())
  
imports: from apache_beam.coders import Coder
  from apache_beam.coders.coders import FastCoder, LengthPrefixCoder
  from apache_beam.portability import common_urns
  from apache_beam.typehints import typehints
  from pyflink import fn_execution
  from pyflink.fn_execution.coders import LengthPrefixBaseCoder
  from pyflink.fn_execution.flink_fn_execution_pb2 import CoderInfoDescriptor
label_desc: Use image node_id 3 for calling the FlinkCoder obj's underlying member method code with example usage: obj.get_impl() and returns: FlinkLengthPrefixCoderBeamWrapper, FlinkFieldCoderBeamWrapper