Robert Haas escribió:
> We allow extensibility and hooks in other parts of the database where
> the use case is pretty thin and tenuous. I betcha there aren't many
> people who try writing their own eqjoinsel() either.
The PostGIS guys do implement their own selectivity estimators. In fact
it was them that first implemented pluggability in that area, AFAIR.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
