Add Python library build toolchain about arrow-migration HOT 5 CLOSED

Note: Comment by Maciej Bryński (maver1ck):
Why not CFFI ?
https://cffi.readthedocs.org/en/latest/

In fact this is modern standard to communicate between Python and C.
CFFI has one big advantage over Cython. It works with PyPy.

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Note: Comment by Wes McKinney (wesm):
"In fact this is modern standard to communicate between Python and C." – this is not true at all in the scientific Python / PyData ecosystem. As you will see when I get the patches put together, the extent of the low-level interoperability required to make this work well goes significantly beyond what is possible with CFFI. In particular, significant use of the Python and NumPy C APIs.

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Note: Comment by Wes McKinney (wesm):
Of course, you are more than welcome to contribute CFFI wrappers for libarrow for use in PyPy.

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Note: Comment by Wes McKinney (wesm):
see patch: apache/arrow#17

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Note: Comment by Wes McKinney (wesm):
Issue resolved by pull request 17
apache/arrow#17

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