This particular change, in it's complete form, would be challenging in my opinion. Many other kinds of planner changes aren't so bad though, but people (includi

This particular change, in it's complete form, would be challenging in my opinion. Many other kinds of planner changes aren't so bad though, but people (including me) tend to avoid them. Executor changes are much less intimidating and lots of people make executor changes. In my opinion, the executor is the most approachable/easiest major component. I would encourage people to not get intimidated though. For every project where I was determined enough, I succeeded. Tom Lane does especially amazing things, of course, but I think reasoning like "I'm not Tom Lane, therefore the planner is too hard" is the wrong lesson to take away.