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fix: mutating input df in viz.py (#11795)

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Ville Brofeldt 2020-11-25 12:55:00 +02:00 committed by GitHub
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superset/viz.py
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@ -1671,6 +1671,7 @@ class DistributionBarViz(BaseViz):
# pandas will throw away nulls when grouping/pivoting,
# so we substitute NULL_STRING for any nulls in the necessary columns
filled_cols = self.groupby + columns
df = df.copy()
df[filled_cols] = df[filled_cols].fillna(value=NULL_STRING)
row = df.groupby(self.groupby).sum()[metrics[0]].copy()