Bruce Momjian wrote:
> Probably the most controvertial change was to move on-disk bitmap
> indexes to the "not wanted" section, though I kept the links in case we
> change our minds. I just can't see how they would be a win with GIN and
> in-memory bitmaps.
Yeah, I recall we discussed bitmap indexes a lot and we found there
wasn't a lot of room to use them because GIN is just too good, it seems.
Also, the patches that were developed had a number of issues. Anyone
wanting to develop bitmap indexes would probably be better off starting
from scratch.
> (I don't think BRIN indexes help for on-disk bitmap use-cases, do
> they?)
No, they don't. I expect BRIN to be very bad in a limited domain (which
is where bitmap indexes are supposed to shine), except under specific
conditions.
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Álvaro Herrera http://www.2ndQuadrant.com/
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