From 9bbc9b642aed985e6142c76ee90df09f9e9261a8 Mon Sep 17 00:00:00 2001
From: playfund <windev@foxmail.com>
Date: Wed, 10 Jan 2024 09:34:32 +0800
Subject: [PATCH] Delete redundant copy() code to speed up

Delete redundant copy() code to speed up
---
 qlib/data/data.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/qlib/data/data.py b/qlib/data/data.py
index 116827f232..1b1353ee4e 100644
--- a/qlib/data/data.py
+++ b/qlib/data/data.py
@@ -536,7 +536,6 @@ def get_column_names(fields):
         """
         if len(fields) == 0:
             raise ValueError("fields cannot be empty")
-        fields = fields.copy()
         column_names = [str(f) for f in fields]
         return column_names