hi, all NOTE: Version is 8.4 Fedora 20 X86_64 for understanding optimizer's internals, I
*set debug_print_plan=on* and created two tables as follows : *create table Reserves (sid integer, bid integer,day date,rname char(25));create table Sailors(sid integer,sname char(25),rating integer,age real);* and add 1,000,000 records for each. and execute the cmd: *select S.rating,count(*) from Sailors S where S.rating > 5 and S.age = 20 group by S.rating;* but from the log, I only found the final selected planTree, so I want to ask: what should I do if I want to see the other alternative planTrees? any advice will be apprecitaed! Dillon Peng