Darren Lafreniere wrote:
> "In addition to simply finding the rows to be returned by a query, an index
> may be able to deliver them in a specific sorted order. This allows a
> query's ORDER BY specification to be honored without a separate sorting
> step. Of the index types currently supported by PostgreSQL, only B-tree can
> produce sorted output — the other index types return matching rows in an
> unspecified, implementation-dependent order."
>
> We found a pgsql-hackers thread from about a year ago about optimizing
> ORDER BY for BRIN indexes. Tom Lane suggested that he was working on it:
> https://www.postgresql.org/message-id/11881.1443393360%40sss.pgh.pa.us
Tom said he was working on some infrastructure planner changes
("upper-planner path-ification"), not that he was working on improving
usage of BRIN indexes. As far as I know, nobody has worked on that.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services