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

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

    [ https://issues.apache.org/jira/browse/ARROW-12825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17347062#comment-17347062 ] 

Alessandro Molina commented on ARROW-12825:
-------------------------------------------

Cross-Linking the related Cython issue -> https://github.com/cython/cython/issues/4171

> [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
>            Assignee: Alessandro Molina
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 5.0.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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