Exemple #1
0
func newSargLT(expr *expression.LT) *sargLT {
	rv := &sargLT{}
	rv.sarg = func(expr2 expression.Expression) (Spans, error) {
		if expr.EquivalentTo(expr2) {
			return _SELF_SPANS, nil
		}

		var exprs expression.Expressions
		span := &Span{}

		if expr.First().EquivalentTo(expr2) {
			exprs = expression.Expressions{expr.Second().Static()}
			span.Range.High = exprs
		} else if expr.Second().EquivalentTo(expr2) {
			exprs = expression.Expressions{expr.First().Static()}
			span.Range.Low = exprs
		}

		if len(exprs) == 0 {
			return nil, nil
		}

		span.Range.Inclusion = datastore.NEITHER
		return Spans{span}, nil
	}

	return rv
}