BUG: pivot_table may raise TypeError without values

[sinhrks]

• tests added / passed
• passes git diff upstream/master | flake8 --diff
• whatsnew entry

pivot_table raises TypeError when index or columns is array-like and values is not specified.

df = pd.DataFrame({'A': [1, 2, 3, 4, 5]},
                  index=pd.DatetimeIndex(['2011-01-01', '2011-02-01', '2011-01-02', '2011-01-01', '2011-01-02']))
df.pivot_table(index=df.index.month, columns=df.index.day)
# TypeError: unhashable type: 'numpy.ndarray'

[codecov-io]

Current coverage is 85.25% (diff: 100%)

Merging #14380 into master will increase coverage by <.01%

@@             master     #14380   diff @@
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  Files           140        140          
  Lines         50631      50636     +5   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits          43166      43172     +6   
+ Misses         7465       7464     -1   
  Partials          0          0          

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[jreback]

@sinhrks I think close and open a new PR. the pydata -> pandas-dev changed caused which things.

[sinhrks]

thx for the notice. The branch status has been updated properly without re-issuing the PR. Pls take a look when you have a time.

[jreback]

thanks @sinhrks