guoxin-li opened a new issue #12066:
URL: https://github.com/apache/incubator-superset/issues/12066
**Issue**
This issue has been seen in superset 0.26, 0.35, and the latest version of
0.36. When queries with more than one entires of `Group by` for Time-Series
Table, the following error is showing up :
`Unexpected Error
keys must be str, int, float, bool or None, not tuple`
[](url)
**How to reproduce this Error:**
Use any available data source to create a TIME-SERIES TABLE, add more than
one Group by entries and run query
**Trace log**
`Traceback (most recent call last):
File
"/opt/superset/venv/lib/python3.6/site-packages/superset/views/base.py", line
120, in wraps
return f(self, *args, **kwargs)
File
"/opt/superset/venv/lib/python3.6/site-packages/superset/utils/decorators.py",
line 69, in wrapper
return f(*args, **kwargs)
File
"/opt/superset/venv/lib/python3.6/site-packages/superset/views/core.py", line
1092, in explore_json
viz_obj, csv=csv, query=query, results=results, samples=samples
File
"/opt/superset/venv/lib/python3.6/site-packages/superset/views/core.py", line
1014, in generate_json
return data_payload_response(*viz_obj.payload_json_and_has_error(payload))
File "/opt/superset/venv/lib/python3.6/site-packages/superset/viz.py", line
478, in payload_json_and_has_error
return self.json_dumps(payload), has_error
File "/opt/superset/venv/lib/python3.6/site-packages/superset/viz.py", line
470, in json_dumps
obj, default=utils.json_int_dttm_ser, ignore_nan=True, sort_keys=sort_keys
File
"/opt/superset/venv/lib64/python3.6/site-packages/simplejson/_init_.py", line
412, in dumps
**kw).encode(obj)
File
"/opt/superset/venv/lib64/python3.6/site-packages/simplejson/encoder.py", line
296, in encode
chunks = self.iterencode(o, _one_shot=True)
File
"/opt/superset/venv/lib64/python3.6/site-packages/simplejson/encoder.py", line
378, in iterencode
return _iterencode(o, 0)
TypeError: keys must be str, int, float, bool or None, not tuple
`
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