looks like a deal for contrib/bloom index in upcoming 9.6 release
Curious, it doesn't look like it will work with booleans out of the box.
http://www.postgresql.org/docs/devel/static/bloom.html
There is no rocket science here:
# create table x (v bool);
# create index i on x using bloom ((v::int4));
# set enable_seqscan=off; --because of empty table
# explain select * from x where v::int4 = 1;
QUERY PLAN
------------------------------------------------------------------
Bitmap Heap Scan on x (cost=25.08..35.67 rows=14 width=1)
Recheck Cond: ((v)::integer = 1)
-> Bitmap Index Scan on i (cost=0.00..25.07 rows=14 width=0)
Index Cond: ((v)::integer = 1)
Or cast it to "char" type (with quoting!)
--
Teodor Sigaev E-mail: teodor@xxxxxxxxx
WWW: http://www.sigaev.ru/
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