It cannot already do what I want, unless you blatantly ignore what I wrote. Putting coalesce() calls *everywhere* counts as more work, don't you agree?

-Glen

Ben wrote:
But, why do you need an extension when the existing system can already do what you want?



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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
      match

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