Do not apply empty apply (#465)

holoviz · May 25, 2020 · f6275e0 · f6275e0
1 parent f11f9e4
commit f6275e0
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/hvplot/util.py b/hvplot/util.py
@@ -399,7 +399,8 @@ def process_derived_datetime_pandas(data, not_found, indexes=None):
                 index = data.axes[indexes.index(base_col)]
                 if isdate(index):
                     extra_cols[var] = getattr(index, dt_str)
-    data = data.assign(**extra_cols)
+    if extra_cols:
+        data = data.assign(**extra_cols)
     not_found = [var for var in not_found if var not in extra_cols.keys()]
 
     return not_found, data