Tom Lane wrote:
The information we've seen says that the only statistically
reliable way
to arrive at an accurate n_distinct estimate is to examine most of the
table :-(.
IIRC I picked an equation out of the literature partially on the basis
of it being simple and fairly cheap to compute...
I'm very curious about this - can you recall where you got this, or
at least point me to where in the code this happens?
Thanks.
- John Burger
MITRE
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