BUG: hopefully fixed factor_indexer in reshape.py; failed on 32-bit platformsx

Author: jreback

pandas/core/reshape.py

@@ -835,4 +835,4 @@ def block2d_to_blocknd(values, items, shape, labels, ref_items=None):
 def factor_indexer(shape, labels):
     """ given a tuple of shape and a list of Factor lables, return the expanded label indexer """
     mult = np.array(shape)[::-1].cumprod()[::-1]
-    return (np.sum(np.array(labels).T * np.append(mult, [1]), axis=1).T).astype('i8')
+    return com._ensure_platform_int(np.sum(np.array(labels).T * np.append(mult, [1]), axis=1).T)