Teodor Sigaev <teodor@sigaev.ru> writes:
>> useful optimizations most of the time. Have you done any benchmarking
>> to find out what the cost is when the optimizations don't succeed?
> Test runs on my notebook with PIII/512Mb, FreeBSD 6.1, postgres was compiled
> with -O0 and --enable-debug --enable-cassert
This is not responding to my concern. What you presented was an
advertisement for the cases where the patch is able to find a better
plan. What I want to know about is how much planning time is added
for queries that it's *not* able to improve. EXPLAIN ANALYZE output
doesn't address that point because it doesn't show planning time.
regards, tom lane