if I have two dataframes df_target and df_source, can I do df_target.as("t).merge(df_source.as("s"), "s.id=t.id").whenMatched().updateAll().whenNotMatched.insertAll.execute().

when I tried the code above, I got the error "merge is not a member of the dataframe". If that is the case, what is the best way to do it? Thanks!