docs: public void marshall(SourceSchema sourceSchema, ProtocolMarshaller protocolMarshaller) {
  
          if (sourceSchema == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(sourceSchema.getRecordFormat(), RECORDFORMAT_BINDING);
              protocolMarshaller.marshall(sourceSchema.getRecordEncoding(), RECORDENCODING_BINDING);
              protocolMarshaller.marshall(sourceSchema.getRecordColumns(), RECORDCOLUMNS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }