def add_field_for(self, fields, df):
        sf = get_atomizer(self.actor, df, df.name)
        if sf == None:  # dummy fields
            return
        if sf not in self.all_fields:
            self.all_fields.append(sf)

        # sf = self.df2sf.get(df,None)
        # if sf is None:
            # sf = self.create_atomizer(df,df.name)
            # self.all_fields.append(sf)
            # self.df2sf[df] = sf
        fields.append(sf)
dataset/ETHPy150Open lsaffre/lino/lino/core/store.py/Store.add_field_for/operator `is` -> `==`