Dask 2.1.0, KeyError: 'Column not found: 0' ? #5124
Description
I have a data frame with varying types and am getting the subject error when trying to groupby
After review of some posts on meta and am still not certain where to add meta, since both from_pandas(df, meta) and other attempts fail.
for idx,grp in ddf.groupby(['f1','f2',ddf.dt64.dt.dayofweek,ddf.dt64.dt.hour,ddf.dt64.dt.minute]):
....
C:\g\test\lib\dask\dataframe\groupby.py in __getitem__(self, key)
1523
1524 # error is raised from pandas
-> 1525 g._meta = g._meta[key]
1526 return g
1527
C:\g\test\lib\pandas\core\base.py in __getitem__(self, key)
266 else:
267 if key not in self.obj:
--> 268 raise KeyError("Column not found: {key}".format(key=key))
269 return self._gotitem(key, ndim=1)
270
KeyError: 'Column not found: 0'