[GitHub] [incubator-superset] suddjian commented on a change in pull request #8724: handle nulls in bar chart series/breakdown

[GitBox <gi...@apache.org>]

suddjian commented on a change in pull request #8724: handle nulls in bar chart series/breakdown
URL: https://github.com/apache/incubator-superset/pull/8724#discussion_r353343947
 
 

 ##########
 File path: superset/viz.py
 ##########
 @@ -1543,10 +1544,15 @@ def query_obj(self):
     def get_data(self, df):
         fd = self.form_data
         metrics = self.metric_labels
+        columns = fd.get("columns") or []
+
+        # pandas will throw away nulls when grouping/pivoting,
+        # so we substitute NULLSTRING for any nulls in the necessary columns
+        filled_cols = self.groupby + columns
+        df[filled_cols] = df[filled_cols].fillna(value=NULLSTRING)
 
 Review comment:
   When I try `df[filled_cols].fillna(value=NULLSTRING, inplace=True)` I get this warning:
   
   > SettingWithCopyWarning:
   > A value is trying to be set on a copy of a slice from a DataFrame
   > See the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy

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