func newSargAnd(expr *expression.And) *sargAnd {
rv := &sargAnd{}
rv.sarg = func(expr2 expression.Expression) (spans Spans, err error) {
if expr.EquivalentTo(expr2) {
return _SELF_SPANS, nil
}
for _, op := range expr.Operands() {
s := SargFor(op, expr2)
if s == nil {
continue
}
if spans == nil {
spans = s
} else {
spans = constrain(spans, s)
}
}
return
}
return rv
}
func newSubsetAnd(expr *expression.And) *subsetAnd {
rv := &subsetAnd{}
rv.test = func(expr2 expression.Expression) (bool, error) {
for _, child := range expr.Operands() {
if SubsetOf(child, expr2) {
return true, nil
}
}
return false, nil
}
return rv
}
func (this *JSConverter) VisitAnd(expr *expression.And) (interface{}, error) {
var buf bytes.Buffer
buf.WriteString("(")
for i, op := range expr.Operands() {
if i > 0 {
buf.WriteString(" && ")
}
buf.WriteString(this.Visit(op))
}
buf.WriteString(")")
return buf.String(), nil
}