Dave Challis created ARROW-2423:

             Summary: [Python] PyArrow datatypes raise ValueError on equality 
checks against non-PyArrow objects
                 Key: ARROW-2423
                 URL: https://issues.apache.org/jira/browse/ARROW-2423
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.9.0
         Environment: Mac OS High Sierra
PyArrow 0.9.0 (py36_1)
Python 3.6.3
            Reporter: Dave Challis

Checking a PyArrow datatype object for equality with non-PyArrow datatypes 
causes a `ValueError` to be raised, rather than either returning a True/False 
value, or returning 
 if the comparison isn't implemented.

E.g. attempting to call:
import pyarrow
pyarrow.int32() == 'foo'
results in:
Traceback (most recent call last):
  File "types.pxi", line 1221, in pyarrow.lib.type_for_alias
KeyError: 'foo'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "t.py", line 2, in <module>
    pyarrow.int32() == 'foo'
  File "types.pxi", line 90, in pyarrow.lib.DataType.__richcmp__
  File "types.pxi", line 113, in pyarrow.lib.DataType.equals
  File "types.pxi", line 1223, in pyarrow.lib.type_for_alias
ValueError: No type alias for foo
The expected outcome for the above would be for the comparison to return 
`False`, as that's the general behaviour for comparisons between objects of 
different types (e.g. `1 == 'foo'` or `object() == 12.4` both return `False`).

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