unhashable type: 'dict'

A clear and concise description of what the bug is.

Expected results

Display a simple table of my data. (Ultimately I want to plot a time series line graph of values).

I have the following csv

datetime,level
2019-04-07 17:30:00,0.401
2019-04-07 17:45:00,0.402
2019-04-07 18:00:00,0.402
2019-04-07 18:15:00,0.402
2019-04-07 18:30:00,0.402

When you display the data or a line graph, you get an unhashable type ‘dict’ for numeric column.

Actual results

unhashable type: ‘dict’

Traceback (most recent call last):
  File "/home/superset/superset/views/base.py", line 118, in wraps
    return f(self, *args, **kwargs)
  File "/home/superset/superset/utils/decorators.py", line 63, in wrapper
    check_perms(*args, **kwargs)
  File "/home/superset/superset/views/core.py", line 122, in check_datasource_perms
    force=False,
  File "/home/superset/superset/views/utils.py", line 114, in get_viz
    force=force,
  File "/home/superset/superset/viz.py", line 112, in __init__
    self.process_metrics()
  File "/home/superset/superset/viz.py", line 126, in process_metrics
    self.metric_dict[label] = o
TypeError: unhashable type: 'dict'

Screenshots

How to reproduce the bug

1. Upload a CSV containing data as sample above.
2. Run query on the table using parameters as in screenshot.
3. See error

Environment

Built using these commands

git clone https://github.com/apache/incubator-superset/
cd incubator-superset/contrib/docker
# prefix with SUPERSET_LOAD_EXAMPLES=yes to load examples:
docker-compose run --rm superset ./docker-init.sh
# you can run this command everytime you need to start superset now:
docker-compose up

Checklist

Make sure these boxes are checked before submitting your issue - thank you!

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

[elukey]

It would be great to have a more meaningful error message though, this one is really cryptic 😃

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