Re: Index-only scans vs. partially-retrievable indexes

Andrey Borodin  writes:
> I've tried to toy with the patch and remembered one related caveat.
> If we have index for both returnable and nonreturnable attributes, IOS will not be choosen:

> postgres=# create index on t using gist(a gist_trgm_ops) include (a);
> postgres=# explain select * from t where a like 'z';
>                              QUERY PLAN                              
> ---------------------------------------------------------------------
>  Index Scan using t_a_a1_idx on t  (cost=0.12..8.14 rows=1 width=32)
>    Index Cond: (a ~~ 'z'::text)
> (2 rows)

This case is improved by 0002, no?

			regards, tom lane