jian he writes:
> if (nrows > MAXIMUM_ROWCOUNT || isnan(nrows))
> nrows = MAXIMUM_ROWCOUNT;
> else if (nrows <= 1.0)
> nrows = 1.0;
> else
> nrows = rint(nrows);
> The comments say `Avoid infinite and NaN`
> but actually we only avoid NaN.
Really? The IEEE float arithmetic standard
hi.
/*
* clamp_row_est
* Force a row-count estimate to a sane value.
*/
double
clamp_row_est(double nrows)
{
/*
* Avoid infinite and NaN row estimates. Costs derived from such values
* are going to be useless. Also force the estimate to be at least one
* row, to make explain output look bette
