Re: BUG #17969: Assert failed in bloom_init() when false_positive_rate = 0.25

Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> writes:
> It seems that the minimum false positive rate also doesn't work:

> postgres(1:3419179)=# create table t (a int);
> CREATE TABLE
> postgres(1:3419179)=# create index t_idx on t using brin (a
> int4_bloom_ops (false_positive_rate = 0.0001));
> CREATE INDEX
> postgres(1:3419179)=# insert into t values (1);
> 2023-06-16 11:14:01.349 JST [3419179] ERROR: the bloom filter is too
> large (8924 > 8144)
> 2023-06-16 11:14:01.349 JST [3419179] STATEMENT: insert into t values (1);
> ERROR: the bloom filter is too large (8924 > 8144)

Hmm, but it would work with a larger page size, right? If so
I'm disinclined to move the minimum. What I don't like about
the above is that the failure doesn't occur until you actually
insert an index entry. Is there a way to check for this at
CREATE INDEX time?

regards, tom lane