On Fri, Nov 25, 2022 at 7:34 AM David Rowley <dgrowle...@gmail.com> wrote:
> Since upper-level WindowAggs cannot reference values calculated in > some lower-level WindowAgg, why can't we just NULLify the pointers > instead? See attached. Verified the problem is fixed with this patch. I'm not familiar with the WindowAgg execution codes. As far as I understand, this patch works because we set ecxt_aggnulls to true, making it a NULL value. And the top-level WindowAgg node's "Filter" is strict so that it can filter out all the tuples that don't match the intermediate WindowAgg node's run condition. So I find the comments about "WindowAggs above us cannot reference the result of another WindowAgg" confusing. But maybe I'm missing something. Thanks Richard
