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https://issues.apache.org/jira/browse/ARROW-2423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16437222#comment-16437222
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Antoine Pitrou commented on ARROW-2423:
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Agreed with this. It should be an easy fix.
> [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
> Priority: Minor
> Labels: beginner
>
> 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
> [NotImplemented|https://docs.python.org/3/library/constants.html#NotImplemented]
> if the comparison isn't implemented.
> E.g. attempting to call:
> {code:java}
> import pyarrow
> pyarrow.int32() == 'foo'
> {code}
> results in:
> {code:java}
> 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
> {code}
> 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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