minh5 commented on issue #5827: [WIP] Improve column/alias handling for case 
insensitive engines
URL: 
https://github.com/apache/incubator-superset/pull/5827#issuecomment-420688019
 
 
   No problem, @villebro , I don't mind testing since I would really love for 
this bug to be ironed out. Right now I just have a very hacky way of dealing 
with Redshift data since my org only uses Redshift. However, running the latest 
test I've ran into this
   
   ```
   2018-09-12 11:15:01,596:INFO:root:SELECT DATE_TRUNC('day', day) AT TIME ZONE 
'UTC' AS __timestamp, SUM(itemsales) AS "sum(itemsales)"
   FROM test.sales_table
   WHERE day >= '2017-09-12 00:00:00' AND day <= '2018-09-12 00:00:00' GROUP BY 
DATE_TRUNC('day', day) AT TIME ZONE 'UTC' ORDER BY "sum(itemsales)" DESC
    LIMIT 10000
   2018-09-12 11:15:01,622:INFO:root:Database.get_sqla_engine(). Masked URL: 
redshift+psycopg2://testuser:[email protected]:5439/testdb
   2018-09-12 11:15:05,136:DEBUG:root:[stats_logger] (incr) loaded_from_source
   2018-09-12 11:15:05,506:INFO:werkzeug:127.0.0.1 - - [12/Sep/2018 11:15:05] 
"POST /superset/explore_json/ HTTP/1.1" 500 -
   Traceback (most recent call last):
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/app.py",
 line 1997, in __call__
       return self.wsgi_app(environ, start_response)
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/app.py",
 line 1985, in wsgi_app
       response = self.handle_exception(e)
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/app.py",
 line 1540, in handle_exception
       reraise(exc_type, exc_value, tb)
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/_compat.py",
 line 33, in reraise
       raise value
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/app.py",
 line 1982, in wsgi_app
       response = self.full_dispatch_request()
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/app.py",
 line 1614, in full_dispatch_request
       rv = self.handle_user_exception(e)
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/app.py",
 line 1517, in handle_user_exception
       reraise(exc_type, exc_value, tb)
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/_compat.py",
 line 33, in reraise
       raise value
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/app.py",
 line 1612, in full_dispatch_request
       rv = self.dispatch_request()
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask/app.py",
 line 1598, in dispatch_request
       return self.view_functions[rule.endpoint](**req.view_args)
     File "/Users/minhmai/incubator-superset/superset/models/core.py", line 
1010, in wrapper
       value = f(*args, **kwargs)
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/flask_appbuilder/security/decorators.py",
 line 52, in wraps
       return f(self, *args, **kwargs)
     File "/Users/minhmai/incubator-superset/superset/views/core.py", line 
1180, in explore_json
       force=force)
     File "/Users/minhmai/incubator-superset/superset/views/core.py", line 
1114, in generate_json
       return json_success(viz_obj.json_dumps(payload), status=status)
     File "/Users/minhmai/incubator-superset/superset/viz.py", line 444, in 
json_dumps
       sort_keys=sort_keys,
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/simplejson/__init__.py",
 line 399, in dumps
       **kw).encode(obj)
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/simplejson/encoder.py",
 line 296, in encode
       chunks = self.iterencode(o, _one_shot=True)
     File 
"/Users/minhmai/.pyenv/versions/3.4.3/envs/superset/lib/python3.4/site-packages/simplejson/encoder.py",
 line 378, in iterencode
       return _iterencode(o, 0)
     File "/Users/minhmai/incubator-superset/superset/utils.py", line 380, in 
json_int_dttm_ser
       obj = datetime_to_epoch(obj)
     File "/Users/minhmai/incubator-superset/superset/utils.py", line 366, in 
datetime_to_epoch
       return (dttm - epoch_with_tz).total_seconds() * 1000
     File "pandas/_libs/tslibs/timestamps.pyx", line 311, in 
pandas._libs.tslibs.timestamps._Timestamp.__sub__
   
   TypeError: Timestamp subtraction must have the same timezones or no timezones
   ```

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