pg_regress failures after bitmap prefetch patch

[MMeent]

Steps to reproduce

PG15 with 96126171 fails, but without it doesn't.

Expected result

pg_regress doesn't fail.

Actual result

There is an off-by-one in the bitmap scan results:

 insert into bmscantest select r, 'fooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo' FROM generate_series(1,100000) r;
 create index i_bmtest ON bmscantest(a);
 select count(*) from bmscantest where a>1;
- count 
--------
- 99999
+ count  
+--------
+ 100000
 (1 row)
 
 -- test accumulation of stats for parallel nodes

Environment

Postgres 15, Postgres 14.

Logs, links

[kelvich]

Fixed in neondatabase/postgres#260 and neondatabase/postgres#261