Re: Bool btree_gin index not chosen on equality contraint, but on greater/lower?

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Hi Tom,

Tom Lane schrieb am 14.02.2016 um 17:51:
> Patric Bechtel  writes:
>> I tried to add bool support to the btree_gin contrib module, and as far as I can tell, it
>> seems to work (wasn't that complicated, actually). But now I'm stuck, as PostgreSQL doesn't
>> seem to like to use my new index, if I use equality or unequality, just with greater and
>> lower than.
> 
> I think your problem is that the planner won't apply match_boolean_index_clause() or
> expand_boolean_index_clause(), because it has a hard-wired idea of which index opclasses could 
> possibly benefit from that, cf IsBooleanOpfamily().

oh, sh*t...

My motivation was the size of the bool indexes; they are tiny and really fast. It feels almost
like bitmap indexes.

I hope that's not too far over my head already... but I'll take a look.

If someone might give me a hint where to look, I'd be grateful.

Thanks a lot for the hint,

Patric
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