Wes McKinney created ARROW-6626:
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             Summary: [Python] Handle "set" values as lists when converting to 
Arrow
                 Key: ARROW-6626
                 URL: https://issues.apache.org/jira/browse/ARROW-6626
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Wes McKinney


See current behavior

{code}
In [1]: pa.array([{1,2, 3}])                                                    
               
---------------------------------------------------------------------------
ArrowInvalid                              Traceback (most recent call last)
<ipython-input-1-20fea2f9457a> in <module>
----> 1 pa.array([{1,2, 3}])

~/code/arrow/python/pyarrow/array.pxi in pyarrow.lib.array()

~/code/arrow/python/pyarrow/array.pxi in pyarrow.lib._sequence_to_array()

~/code/arrow/python/pyarrow/error.pxi in pyarrow.lib.check_status()

ArrowInvalid: Could not convert {1, 2, 3} with type set: did not recognize 
Python value type when inferring an Arrow data type
In ../src/arrow/python/iterators.h, line 70, code: func(value, 
static_cast<int64_t>(i), &keep_going)
In ../src/arrow/python/inference.cc, line 621, code: 
inferrer.VisitSequence(obj, mask)
In ../src/arrow/python/python_to_arrow.cc, line 1074, code: InferArrowType(seq, 
mask, options.from_pandas, &real_type)
{code}



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