[Python] Missing MapType to Pandas dtype

[asfimport]

The Map type conversion to Pandas done in ARROW-10151 forgot to add dtype mapping for to_pandas_dtype()

 

In [2]: d = pa.map_(pa.int64(), pa.float64())                                                                                In [3]: d.to_pandas_dtype()                                                                                                  
---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)
<ipython-input-3-08beaa635a3e> in <module>
----> 1 d.to_pandas_dtype()~/miniconda2/envs/pyarrow-test/lib/python3.7/site-packages/pyarrow/types.pxi in pyarrow.lib.DataType.to_pandas_dtype()NotImplementedError: map<int64, double>

Reporter: Bryan Cutler / @BryanCutler
Assignee: Derek Marsh / @dmarsh19

Related issues:

• [Python] Add support MapArray to_pandas conversion (is related to)

PRs and other links:

• GitHub Pull Request #8422

_{Note: This issue was originally created as ARROW-10260. Please see the migration documentation for further details.}

[asfimport]

Bryan Cutler / @BryanCutler:
Should be a quick fix, so marking this for 2.0.0

[asfimport]

Derek Marsh / @dmarsh19:
I appreciate the opportunity to contribute.
#8422

[asfimport]

Krisztian Szucs / @kszucs:
Issue resolved by pull request 8422
#8422