$ python sync_query_params.py struct 7 hello
Traceback (most recent call last):
  File "sync_query_params.py", line 204, in <module>
    sync_query_struct_params(args.x, args.y)
  File "sync_query_params.py", line 139, in sync_query_struct_params
    query_results.run()
  File "/Users/swast/src/google-cloud-python/bigquery/google/cloud/bigquery/query.py", line 360, in run
    method='POST', path=path, data=self._build_resource())
  File "/Users/swast/venvs/bq-dml/lib/python3.5/site-packages/google/cloud/_http.py", line 335, in api_request
    error_info=method + ' ' + url)
google.cloud.exceptions.BadRequest: 400 Invalid query parameter type (POST https://www.googleapis.com/bigquery/v2/projects/cloud-samples-tests/queries)

{
  'name': 'struct_value',
  'parameterValue': {
    'structValues': {'y': 'hello', 'x': '7'}
  },
  'parameterType': {
    'structTypes': [{'type': 'INT64', 'name': 'x'}, {'type': 'STRING', 'name': 'y'}]
  }
}

{
      "name": "struct_value",
      "parameterType": {
        "type": "STRUCT",
        "structTypes": [
          {
            "name": "x",
            "type": {
              "type": "INT64"
            }
          },
          {
            "name": "y",
            "type": {
              "type": "STRING"
            }
          }
        ]
      },
      "parameterValue": {
        "structValues": {
          "x": {
            "value": "1"
          },
          "y": {
            "value": "foo"
          }
        }
      }
    }