more detailed description of tup_returned and tup_fetched

Hi,

I worried the difference between "tup_returned" and "tup_fetched" in
pg_stat_database. I assumed that "tup_returned" means the number of tuples
that returned to clients. Of course, this is wrong.

So, why don't you describe in more detail? If my understanding is right, they
correspond to "seq_tup_read" and "idx_tup_fetch" in pg_stat_all_tables.

Regards,
-- 
Masahiro Ikeda
NTT DATA CORPORATION