> May be it's time to revisit an old proposal that has failed to catch
> anybody's attention during the 7.4 beta period:
> http://archives.postgresql.org/pgsql-hackers/2003-08/msg00937.php
>
> I'm not sure I'd store index correlation in a separate table today.
> You've invented something better for functional index statistics, AFAIR.
Make it deal with cross-table fk correlations as well :)
Chris