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84b8fccbe5
c01743aa4and later161320b4badjusted the EXPLAIN output to show which plan nodes were chosen despite being disabled by the various enable* GUCs. Prior toe22253467, the disabledness of a node was only evident by a large startup cost penalty. Since we now explicitly tag disabled nodes with a boolean property in EXPLAIN, let's add some documentation to provide some details about why and when disabled nodes can appear in the plan. Author: Laurenz Albe, David Rowley Discussion: https://postgr.es/m/883729e429267214753d5e438c82c73a58c3db5d.camel@cybertec.at