Re: Proposal: "query_work_mem" GUC, to distribute working memory to the query's individual operators

Here's a rebased version of this patch.  I didn't review it or touch it
in any way, just fixed conflicts from current master.

-- 
Álvaro Herrera        Breisgau, Deutschland  —  https://www.EnterpriseDB.com/
"No deja de ser humillante para una persona de ingenio saber
que no hay tonto que no le pueda enseñar algo." (Jean B. Say)