code: private TableFieldSchema getSchemaOfRepeatedFields(Field field) {
      Class<?> parameterType = BigQueryFieldUtil.getParameterTypeOfRepeatedField(field);
      TableFieldSchema tf = parseFieldAnnotations(field);
      tf.setMode(BigQueryFieldMode.REPEATED.getValue());
      if (BigqueryFieldMarshallers.getMarshaller(parameterType) != null) {
        return tf.setType(BigQueryDataTypeUtil.getBigQueryType(
            BigqueryFieldMarshallers.getMarshaller(parameterType).getSchemaType()));
      }
      tf.setType(BigQueryConstants.RECORD_TYPE);
      return tf.setFields(getSchema(parameterType));
    }
docs: Generates {@link TableFieldSchema} for fields which are of repeated type like collection or
  array. It recursively generates schema for the parameter type of the collection or array.