fixup! Move .unstack() logic onto BlockManager and Block

Author: kernc

pandas/core/internals.py

@@ -1562,7 +1562,7 @@ def _unstack(self, new_values, new_placement):
         # NonConsolidatable blocks can have a single item only, so we return
         # one block per item
         return [self.make_block_same_class(vals, [place])
-                for vals, place in zip(new_values.T, new_placement)]
+                for vals, place in zip(new_values, new_placement)]
 
 
 class NumericBlock(Block):
@@ -4091,7 +4091,7 @@ def unstack(self, unstacker):
             new_values, mask = bunstacker.get_new_values()
             new_placement = new_columns.get_indexer(new_items)
             mask_blocks[new_placement] = mask.any(0)
-            new_blocks.extend(blk._unstack(new_values, new_placement))
+            new_blocks.extend(blk._unstack(new_values.T, new_placement))
 
         new_blocks = [b for b, keep in zip(new_blocks, mask_blocks) if keep]
         new_axes = [new_columns[mask_blocks], new_index]