[GitHub] [arrow] jorisvandenbossche commented on pull request #10162: ARROW-12506: [Python] Improve modularity of pyarrow codebase: _ipc module

[GitBox <gi...@apache.org>]

jorisvandenbossche commented on pull request #10162:
URL: https://github.com/apache/arrow/pull/10162#issuecomment-892015848


   I think it would be better to first discuss more what we think the "public Cython API" story should be. Because there currently are packages that use the cython APIs, and this PR might break those packages, without a clear message what they should do instead. 
   
   (in practice they might mostly be using things that are not from the IPC module, though, so this specific PR might not cause much breakage).
   
   Previous time we discussed this I looked for some example packages that interfaces with pyarrow on the cython level:
   
   * BlazingSQL (https://github.com/BlazingDB/blazingsql/blob/94aa7afd1feaba63cf9853eec3824b95b47b46bd/engine/bsql_engine/io/io.pyx, although not directly clear what they are using since they are doing a `*` import)
   * Rapids / cudf (https://github.com/rapidsai/cudf/blob/main/python/cudf/cudf/_lib/gpuarrow.pyx)
   * Cylon (https://github.com/cylondata/cylon/search?q=%22pyarrow.lib%22)
   * Fletcher (https://github.com/abs-tudelft/fletcher/blob/dbe3b3aa20fce72f69341aaa79230b60d79b4efa/runtime/python/pyfletcher/includes/libfletcher.pxd)))
   * Omnisci (https://github.com/omnisci/omniscidb/blob/a667adc9c879edcf8134e52ea5fcf4be234052b9/Embedded/Python/dbe.pyx)
   * katana (https://github.com/KatanaGraph/katana/search?q=%22pyarrow.lib%22)
   * mongo-arrow (https://github.com/mongodb-labs/mongo-arrow/blob/main/bindings/python/pymongoarrow/builders.pyi)
   


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