hi Viktor, > might be more frequently checked than the slack channel as i initially posted > my problem there
Yes -- the mailing list or JIRA is the place you want to go for help. Slack is helpful for real-time interactions but a lot of us (like me) do not spend any time there. Asynchronous, publicly viewable / searchable discussions are better for a worldwide project like this. I am not sure about the linking problem -- this function is being used successfully in the turbodbc project: https://github.com/blue-yonder/turbodbc/blob/c6dd8e2a3d575054b4ec0fe6cbab9a60019ebb0a/cpp/turbodbc_arrow/Library/src/set_arrow_parameters.cpp It would be nice to fix the warning re: C linkage. That's a Cython artifact, I think. Could you open a JIRA about this? Thanks Wes On Wed, Mar 14, 2018 at 12:40 PM, Viktor Gal <wik...@maeth.com> wrote: > Hi, > > i’m writing this email as i thought it might be more frequently checked than > the slack channel as i initially posted my problem there: > i’m trying to use `arrow::py::unwrap_table` in a c++ library that would use > pyarrow tables…. unfortunately when i try to load the generated python module > (shared lib) in the python interpreter, i’m getting a `Symbol not found: > _unwrap_table` exception…. i thought the problem was that i havent linked the > library with `libarrow_python.dylib`, but even after linking with that lib > i’m still getting the same error… anybody has any ideas why there’s `Symbol > not found` error? > > note that when i compile my shared library i’m getting the following warning: > warning: 'unwrap_table' has C-linkage specified, but returns user-defined > type 'arrow::Status' which is incompatible with C [-Wreturn-type-c-linkage] > ARROW_EXPORT Status unwrap_table(PyObject* table, std::shared_ptr<Table>* > out); > > the main idea is that i would pass the pyarrow table to my lightweight python > library that is basically a wrapper around a c++ library. In that wrapper i > would unwrap the pyarrow Table to a simple std::shared_ptr<arrow::Table> > which i would pass to the c++ library, as it can handle standard arrow data > structures. > > cheers, > viktor >
