sql lab function DATE_TRUNC - error

[bbs2009]

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• [+] I have checked the superset logs for python stacktraces and included it here as text if any
• [+] I have reproduced the issue with at least the latest released version of superset
• [+] I have checked the issue tracker for the same issue and I haven't found one similar

Superset version

{"GIT_SHA": "", "version": "0.17.4"}

Expected results

Actual results

in sql lab

in console

2017-04-11 13:20:07,929:INFO:root:SELECT DATE_TRUNC('day', "DATEPARSING") AS __timestamp from marks limit 1
2017-04-11 13:20:07,934:INFO:root:Handling cursor
2017-04-11 13:20:07,938:INFO:root:Fetching data: {'changedOn': datetime.datetime(2017, 4, 11, 10, 20, 8), 'changed_on': '2017-04-11T10:20:08', 'dbId': 4, 'db': 'postgre', 'endDttm': None, 'errorMessage': None, 'executedSql': 'SELECT DATE_TRUNC(\'day\', "DATEPARSING") AS __timestamp from marks limit 1', 'id': 'rkYa675pl', 'limit': 1000000, 'progress': 0, 'rows': None, 'schema': 'public', 'ctas': False, 'serverId': 321, 'sql': 'SELECT DATE_TRUNC(\'day\', "DATEPARSING") AS __timestamp from marks limit 1', 'sqlEditorId': 'rkPz_Tj2x', 'startDttm': Decimal('1491906007825.750000'), 'state': 'running', 'tab': 'Untitled Query 2', 'tempTable': '', 'userId': 1, 'user': 'admin', 'limit_reached': False, 'resultsKey': None}
2017-04-11 13:20:07,950:ERROR:root:zip argument #2 must support iteration
Traceback (most recent call last):
  File "/data/work/virtualenvs/superset3/lib/python3.6/site-packages/superset/views/core.py", line 1994, in sql_json
    query_id=query_id, return_results=True)
  File "/data/work/virtualenvs/superset3/lib/python3.6/site-packages/celery/local.py", line 188, in __call__
    return self._get_current_object()(*a, **kw)
  File "/data/work/virtualenvs/superset3/lib/python3.6/site-packages/celery/app/task.py", line 420, in __call__
    return self.run(*args, **kwargs)
  File "/data/work/virtualenvs/superset3/lib/python3.6/site-packages/superset/sql_lab.py", line 178, in get_sql_results
    'data': cdf.data if cdf.data else [],
  File "/data/work/virtualenvs/superset3/lib/python3.6/site-packages/superset/dataframe.py", line 50, in data
    return self.__df.to_dict(orient='records')
  File "/data/work/virtualenvs/superset3/lib/python3.6/site-packages/pandas/util/decorators.py", line 91, in wrapper
    return func(*args, **kwargs)
  File "/data/work/virtualenvs/superset3/lib/python3.6/site-packages/pandas/core/frame.py", line 857, in to_dict
    for row in self.values]
  File "/data/work/virtualenvs/superset3/lib/python3.6/site-packages/pandas/core/frame.py", line 857, in <listcomp>
    for row in self.values]
TypeError: zip argument #2 must support iteration

in pgadmin4

Steps to reproduce

[mistercrunch]

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