Alternatively, you might be able to cross-join Date and Customer to create a single dimension table which
a common value to join on test_df['join_col'] = 1 sample_churn_0['join_col'] = 1 # perform the cross-join
indices[i] = 0; } boolean keepGoing = true; //emit cross-join
indices[i] = 0; } boolean keepGoing = true; //emit cross-join