ARROW-425: Add private API to get python Table from a C++ object

Change-Id: Ie24aa9469fad064413be66b7e7e566fbc5b299da

python/pyarrow/table.pxd

@@ -57,3 +57,5 @@ cdef class RecordBatch:
 
     cdef init(self, const shared_ptr[CRecordBatch]& table)
     cdef _check_nullptr(self)
+
+cdef api object table_from_ctable(const shared_ptr[CTable]& ctable)

python/pyarrow/table.pyx

@@ -687,5 +687,9 @@ cdef class Table:
         return (self.num_rows, self.num_columns)
 
 
+cdef api object table_from_ctable(const shared_ptr[CTable]& ctable):
+    cdef Table table = Table()
+    table.init(ctable)
+    return table
 
 from_pandas_dataframe = Table.from_pandas

python/setup.py

@@ -204,6 +204,10 @@ class build_ext(_build_ext):
             shutil.move(self.get_ext_built(name), ext_path)
             self._found_names.append(name)
 
+            if os.path.exists(self.get_ext_built_api_header(name)):
+                shutil.move(self.get_ext_built_api_header(name),
+                            pjoin(os.path.dirname(ext_path), name + '_api.h'))
+
         os.chdir(saved_cwd)
 
     def _failure_permitted(self, name):
@@ -225,6 +229,13 @@ class build_ext(_build_ext):
         filename = name + suffix
         return pjoin(package_dir, filename)
 
+    def get_ext_built_api_header(self, name):
+        if sys.platform == 'win32':
+            head, tail = os.path.split(name)
+            return pjoin(head, tail + "_api.h")
+        else:
+            return pjoin(name + "_api.h")
+
     def get_ext_built(self, name):
         if sys.platform == 'win32':
             head, tail = os.path.split(name)