Teodor Sigaev <[EMAIL PROTECTED]> 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

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
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