Subquery optimizer is still is a very early stage in 4.1. Much more often than not, a carefully crafted join, union, or a sequence of queries using a temporary table will be faster. In fact, I wonder if it is even possible to write a machine subquery optimizer that will outperform a good human "optimizer" that re-writes them into something better digestible. Kind of like no super-smart JIT will ever beat a good C programmer on execution speed, although it might help with the development time.
Could there be a program that I can present my query and it gives me some alternatives with a benchmark of them? This may help me to create optimized queries and may inspire me to optimize them even further into a direction I didn't think of yet...
-- Yves Goergen <[EMAIL PROTECTED]>
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