From 01f2f031f1c6dd25b4c9bbb429fa715c1be7b211 Mon Sep 17 00:00:00 2001
From: tp <contribute@tensortable.com>
Date: Sun, 27 Sep 2020 21:26:24 +0100
Subject: [PATCH] don't deepcopy

---
 pandas/core/indexes/multi.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/core/indexes/multi.py b/pandas/core/indexes/multi.py
index c747a66649e35..4e552678baea6 100644
--- a/pandas/core/indexes/multi.py
+++ b/pandas/core/indexes/multi.py
@@ -1594,7 +1594,7 @@ def dropna(self, how="any"):
             raise ValueError(f"invalid how option: {how}")
 
         new_codes = [level_codes[~indexer] for level_codes in self.codes]
-        return self.copy(deep=True).set_codes(codes=new_codes)
+        return self.set_codes(codes=new_codes)
 
     def _get_level_values(self, level, unique=False):
         """