In any case, I think the answer to your original question is that the
fan-out can be up to several hundred per level, but it's not fixed.
OK, its beginning to make sense. So the fan-out is given by the key size
and each child node is stored in its own page. Is that correct?
Thanks in advance!
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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
