[jira] [Created] (ARROW-12825) [Python] PyArrow doesn't compile on upcoming Cython version

["Alessandro Molina (Jira)" <ji...@apache.org>]

Alessandro Molina created ARROW-12825:
-----------------------------------------

             Summary: [Python] PyArrow doesn't compile on upcoming Cython version
                 Key: ARROW-12825
                 URL: https://issues.apache.org/jira/browse/ARROW-12825
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
    Affects Versions: 4.0.0
            Reporter: Alessandro Molina
             Fix For: 5.0.0


Trying to build PyArrow with the current master checkout of Cython results in some compile errors on {{for}} loops.

{code}
Error compiling Cython file:
------------------------------------------------------------
...
    def column_types(self):
        """
        Explicitly map column names to column types.
        """
        d = {frombytes(item.first): pyarrow_wrap_data_type(item.second)
             for item in self.options.column_types}
                        ^
------------------------------------------------------------

pyarrow/_csv.pyx:491:25: Cannot assign type 'pair[string,shared_ptr[CDataType]]' to 'shared_ptr[CDataType]'
{code}

It seems that Cython is going to be less permissive about autodetecting type of iterated items, this can probably be fixed by explicitly declaring the types



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