From fe21de3fc4d0aa5d5bb9ba150683a258f3bbe00c Mon Sep 17 00:00:00 2001
From: Ville Brofeldt <33317356+villebro@users.noreply.github.com>
Date: Fri, 16 Apr 2021 16:48:06 +0300
Subject: [PATCH] fix(viz): time shift read-only error (#14191)

---
 superset/viz.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/superset/viz.py b/superset/viz.py
index 8063a9f8525..5bedc6b399f 100644
--- a/superset/viz.py
+++ b/superset/viz.py
@@ -1362,8 +1362,10 @@ class NVD3TimeSeriesViz(NVD3Viz):
 
             df2 = self.get_df_payload(query_object, time_compare=option).get("df")
             if df2 is not None and DTTM_ALIAS in df2:
+                dttm_series = df2[DTTM_ALIAS] + delta
+                df2 = df2.drop(DTTM_ALIAS, axis=1)
+                df2 = pd.concat([dttm_series, df2], axis=1)
                 label = "{} offset".format(option)
-                df2[DTTM_ALIAS] += delta
                 df2 = self.process_data(df2)
                 self._extra_chart_data.append((label, df2))