Implement column chunking

Signed-off-by: Vasily Litvinov <vasilij.n.litvinov@intel.com>

Author: vnlitvinov

pandas/api/exchange/implementation.py

@@ -405,8 +405,15 @@ def get_chunks(self, n_chunks=None):
         Return an iterator yielding the chunks.
         See `DataFrame.get_chunks` for details on ``n_chunks``.
         """
-        # TODO: implement proper chunking for n_chunks > 1
-        return (self,)
+        if n_chunks and n_chunks > 1:
+            size = len(self._col)
+            step = size // n_chunks
+            if size % n_chunks != 0:
+                step +=1
+            for start in range(0, step * n_chunks, step):
+                yield _PandasColumn(self._col.iloc[start:start + step], self._allow_copy)
+        else:
+            yield self
 
     def get_buffers(self):
         """