checkout: don't filter hash's if it is a file (#5298)

dvc/cache/base.py

@@ -92,7 +92,7 @@ class CloudCache:
         return DirInfo.from_list(d)
 
     def _filter_hash_info(self, hash_info, path_info, filter_info):
-        if not filter_info:
+        if not filter_info or path_info == filter_info:
             return hash_info
 
         dir_info = self.get_dir_cache(hash_info)

tests/func/test_checkout.py

@@ -974,3 +974,14 @@ def test_checkout_partial_subdir(tmp_dir, dvc):
         "foo": "foo",
         "sub_dir": {"bar": "bar", "baz": "baz"},
     }
+
+
+def test_checkout_file(tmp_dir, dvc):
+    tmp_dir.dvc_gen("foo", "foo")
+
+    stats = dvc.checkout("foo")
+    assert not any(stats.values())
+
+    os.unlink("foo")
+    stats = dvc.checkout("foo")
+    assert stats["added"] == ["foo"]