john-bodley 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_r352975382
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File path: superset/viz.py
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@@ -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:
Can we use `inplace=True` to prevent having to make a copy.
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