[Python] Cython 0.25.2 compilation failure

[asfimport]

Observed on master branch

Error compiling Cython file:
------------------------------------------------------------
...
        if hasattr(self, 'as_py'):
            return repr(self.as_py())
        else:
            return super(Scalar, self).__repr__()

    def __eq__(self, other):
   ^
------------------------------------------------------------

/home/wesm/code/arrow/python/pyarrow/scalar.pxi:67:4: Special method __eq__ must be implemented via __richcmp__

Error compiling Cython file:
------------------------------------------------------------
...
        Return true if the tensors contains exactly equal data
        """
        self._validate()
        return self.tp.Equals(deref(other.tp))

    def __eq__(self, other):
   ^
------------------------------------------------------------

/home/wesm/code/arrow/python/pyarrow/array.pxi:571:4: Special method __eq__ must be implemented via __richcmp__

Error compiling Cython file:
------------------------------------------------------------
...
        cdef c_bool result = False
        with nogil:
            result = self.buffer.get().Equals(deref(other.buffer.get()))
        return result

    def __eq__(self, other):
   ^
------------------------------------------------------------

/home/wesm/code/arrow/python/pyarrow/io.pxi:675:4: Special method __eq__ must be implemented via __richcmp__

Upgrading Cython made this go away. We should probably use __richcmp__ though

Reporter: Wes McKinney / @wesm
Assignee: Antoine Pitrou / @pitrou

PRs and other links:

• GitHub Pull Request #1863

_{Note: This issue was originally created as ARROW-2305. Please see the migration documentation for further details.}

[asfimport]

Uwe Korn / @xhochy:
Would raising tge minimal required cython version be ok for us?

[asfimport]

Antoine Pitrou / @pitrou:
I would be fine with raising the minimum Cython version.

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 1863
#1863