On Tue, 2024-01-23 at 13:55 +0800, Richard Guo wrote: > Similar to what we did to GROUP BY keys in 0452b461bc, I think we can do > the same to DISTINCT keys, i.e. reordering DISTINCT keys to match input > path's pathkeys, which can help reduce cost by avoiding unnecessary > re-sort, or allowing us to use incremental-sort to save efforts. > > Attached is a patch for this optimization. Any thoughts?
I didn't scrutinize the code, but that sounds like a fine optimization. Yours, Laurenz Albe
