"Colin 't Hart" <colinth...@gmail.com> writes:
> Would these be difficult to build in?

Well, you'd have to worry about the ALL cases, as well as how to determine
whether you're actually getting a win (which would probably be rather
tough, really, as the choice would have to be made before we've fired up
any of the planner machinery that supports statistical estimation :-().
The code that plans this is in src/backend/optimizer/prep/prepunion.c.

                        regards, tom lane

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