[Python] Mixed-type object DataFrame columns should not silently coerce to an Arrow type by default

[asfimport]

In [4]: df = pd.DataFrame({'a': ['a', 1, 2.0]})

In [5]: df
Out[5]: 
   a
0  a
1  1
2  2

In [6]: pt = pa.Table.from_pandas(df)

In [7]: pt.to_pandas()
Out[7]: 
      a
0     a
1  None
2  None

Reporter: Wes McKinney / @wesm
Assignee: Phillip Cloud / @cpcloud

Related issues:

• Arrow 0.3 release (blocks)

_{Note: This issue was originally created as ARROW-736. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 465
#465