Function CompareDecimals

pkg/sql/sem/tree/datum.go:971–981

CompareDecimals compares 2 apd.Decimals according to the SQL comparison rules, making sure that NaNs sort first.

(d *apd.Decimal, v *apd.Decimal)

// CompareDecimals compares 2 apd.Decimals according to the SQL comparison
// rules, making sure that NaNs sort first.
func CompareDecimals(d *apd.Decimal, v *apd.Decimal) int {
	// NaNs sort first in SQL.
	if dn, vn := d.Form == apd.NaN, v.Form == apd.NaN; dn && !vn {
		return -1
	} else if !dn && vn {
		return 1
	} else if dn && vn {
		return 0
	}
	return d.Cmp(v)
}

// Prev implements the Datum interface.
func (d *DDecimal) Prev(_ *EvalContext) (Datum, bool) {