Re: WIP: cross column correlation ...

> Personally, I think the first thing we ought to do is add a real, bona
> fide planner hint to override the selectivity calculation manually,
> maybe something like this:
> 
> WHERE (x < 5 AND y = 1) SELECTIVITY (0.1);
> 
> Then, having provided a method for the DBA to extinguish the raging
> flames of searing agony which are consuming them while a crocodile
> chews off their leg and their boss asks them why they didn't use
> Oracle, we can continue bikeshedding about the best way of fixing this
> problem in a more user-transparent fashion.

Is there some way we can do that without adding the selectivity hint to
the query itself?  That's the biggest issue with hints.

--                                  -- Josh Berkus                                    PostgreSQL Experts Inc.
                        http://www.pgexperts.com