Hello, on page https://www.postgresql.org/docs/current/row-estimation-examples.html - there is a example: selectivity = (1 - null_frac1) * (1 - null_frac2) * min(1/num_distinct1, 1/num_distinct2) = (1 - 0) * (1 - 0) / max(10000, 10000) = 0.0001 in the first string " * min" and in the second " / max" as I understand it isn't correct.
Division is just multiplication by the reciprocal so while the presentation here is inconsistent it is correct. Likewise, the larger a number the smaller its reciprocal, so the change from min to max also works.
FWIW this used to be presented with the calculation and formula in sync, but the original had a simple typo in the calculation. When the typo got fixed back in December of 2007 [1] the author of the patch simplified the calculation at the same time. I suggest we update the formula line to match the calculation presented.
