added asv FillNA

Author: smithto1

asv_bench/benchmarks/groupby.py

@@ -358,6 +358,21 @@ def time_category_size(self):
         self.draws.groupby(self.cats).size()
 
 
+class FillNA:
+    def setup(self):
+        N = 1500
+        self.df = pd.DataFrame({
+                    'group' : [1] * N + [2] * N,
+                    'value' : [np.nan, 1.0] * N
+                }).set_index('group')
+    
+    def time_df_ffill(self):
+        self.df.groupby('group').fillna(method='ffill')
+    
+    def time_srs_ffill(self):
+        self.df.groupby('group')['value'].fillna(method='ffill')
+
+
 class GroupByMethods:
 
     param_names = ["dtype", "method", "application"]