Groupby save doesn't handle/index ambiguity #1
Description
Avoid errors like this:
FutureWarning: <column name> is both a column name and an index level.
Defaulting to column but this will raise an ambiguity error in a future version
{{ message }}
Avoid errors like this:
FutureWarning: <column name> is both a column name and an index level.
Defaulting to column but this will raise an ambiguity error in a future version