func newSargableUnary(expr expression.UnaryFunction) *sargableUnary {
rv := &sargableUnary{}
rv.test = func(expr2 expression.Expression) (bool, error) {
return expr.Operand().EquivalentTo(expr2), nil
}
return rv
}
func newSargValued(expr expression.UnaryFunction) *sargValued {
rv := &sargValued{}
rv.sarg = func(expr2 expression.Expression) (Spans, error) {
if expr.EquivalentTo(expr2) {
return _SELF_SPANS, nil
}
if !expr.Operand().EquivalentTo(expr2) {
return nil, nil
}
return _VALUED_SPANS, nil
}
return rv
}