> > 2. locking should be easier if only the original heap page is
involved.
>
> Yes, but multi-page update already happens now, so HOT is not
> different on that point.
I was thinking about the case when you "pull back" a tuple, which seems
to be more
difficult than what we have now.
Andreas
PS: I think it is great that you are doing all this work and explaining
it for us. Thanks.
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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