Move NumPy API initialization into libarrow_python

cpp/src/arrow/python/CMakeLists.txt

@@ -47,6 +47,7 @@ set(ARROW_PYTHON_SRCS
   common.cc
   config.cc
   helpers.cc
+  init.cc
   io.cc
   numpy_convert.cc
   pandas_convert.cc
@@ -82,6 +83,7 @@ install(FILES
   config.h
   do_import_numpy.h
   helpers.h
+  init.h
   io.h
   numpy_convert.h
   numpy_interop.h

cpp/src/arrow/python/util/test_main.cc

@@ -19,14 +19,13 @@
 
 #include <gtest/gtest.h>
 
-#include "arrow/python/do_import_numpy.h"
-#include "arrow/python/numpy_interop.h"
+#include "arrow/python/init.h"
 
 int main(int argc, char** argv) {
   ::testing::InitGoogleTest(&argc, argv);
 
   Py_Initialize();
-  arrow::py::import_numpy();
+  arrow::py::InitNumPy();
 
   int ret = RUN_ALL_TESTS();
 

python/pyarrow/_config.pyx

@@ -14,17 +14,14 @@
 # distutils: language = c++
 # cython: embedsignature = True
 
-cdef extern from 'arrow/python/do_import_numpy.h':
+cdef extern from 'arrow/python/init.h':
     pass
 
-cdef extern from 'arrow/python/numpy_interop.h' namespace 'arrow::py':
-    int import_numpy()
-
 cdef extern from 'arrow/python/config.h' namespace 'arrow::py':
     void Init()
     void set_numpy_nan(object o)
 
-import_numpy()
+InitNumPy()
 Init()
 
 import numpy as np