code: def write_long(self, datum):
      self.write(STRUCT_LONG_LONG.pack(datum))
  
imports: import struct
  from avro.io import AvroTypeException, BinaryDecoder, BinaryEncoder, DatumReader, DatumWriter, SchemaResolutionException, Validate
label_desc: Use image node_id 3 for calling the FlinkAvroEncoder obj's underlying member method code with example usage: obj.write_long(datum) without return types