Over on [1] someone was asking about chained window paths making use of already partially sorted input. (The thread is on -general, so I guessed they're not using PG13.)
However, On checking PG13 to see if incremental sort would help their case, I saw it didn't. Looking at the code I saw that create_window_paths() and create_one_window_path() don't make any use of incremental sort paths. I quickly put together the attached. It's only about 15 mins of work, but it seems worth looking at a bit more for some future commitfest. Yeah, I'll need to add some tests as I see nothing failed by changing this. I'll just park this here until then so I don't forget. David
incremental_sort_for_windowpaths.patch
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