Re: allowing extensions to control planner behavior

On Fri, 2024-08-30 at 07:33 -0400, Robert Haas wrote:
> This is a fair point. I dislike the fact that add_path() is a thicket
> of if-statements that's actually quite hard to understand and easy to
> screw up when you're making modifications. But I feel like it would
> be
> difficult to generalize the infrastructure without making it
> substantially slower, which would probably cause too much of an
> increase in planning time to be acceptable. So my guess is that this
> is a dead end, unless there's a clever idea that I'm not seeing.

As far as performance goes, I'm only looking at branch in add_path()
that calls compare_pathkeys(). Do you have some example queries which
would be a worst case for that path?

In general if you can post some details about how you are measuring,
that would be helpful.

Regards,
    Jeff Davis