sqlCompareNullable function
Implementation
int sqlCompareNullable(Object? a, Object? b, {bool nullsFirst = true}) {
if (a == null && b == null) return 0;
if (a == null) return nullsFirst ? -1 : 1;
if (b == null) return nullsFirst ? 1 : -1;
return sqlCompare(a, b);
}