Tom Lane wrote: >It's something that's on the ever-growing TODO list ... I dunno if >anyone has any near-term plans to work on it. It'd definitely be >nice to teach the planner to do joins-over-unions well, and then >make inheritance just invoke that behavior instead of being a crocky >special case. > > Sounds good; currently if you use the polymorphism of inherited tables, and happen to cross 2 such tables, you get O(n^2) performance.
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