func (this *JSConverter) VisitIsNotMissing(expr *expression.IsNotMissing) (interface{}, error) {
var buf bytes.Buffer
buf.WriteString("typeof(")
buf.WriteString(this.Visit(expr.Operand()))
buf.WriteString(") != 'undefined')")
return buf.String(), nil
}
func newSargNotMissing(expr *expression.IsNotMissing) *sargNotMissing {
rv := &sargNotMissing{}
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 _FULL_SPANS, nil
}
return rv
}