On Wed, 6 Nov 2024 at 12:09, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Of course, I might be overestimating the performance benefit we'd get.
> But I'm tempted to give it a try.
I'm glad. I'm curious to see if you're right about the projection
overhead of the flags. If you're right, it seems like a not too
difficult optimisation to get in.
I like the idea as it also gets rid of the flag cruft from
prepunion.c, which saves having to add flags conditionally if
INTERCEPT/EXCEPT were ever made to use joins.
David
