}
if (operand instanceof Length) {
Length length = (Length)operand;
final PropertyValue value = length.getPropertyValue();
String propertyName = value.getPropertyName();
String selectorName = value.selectorName().name();
final ExtractFromRow getPropValue = createExtractFromRow(selectorName, propertyName, context, columns, sources,
defaultType, allowMultiValued);
final TypeFactory<?> longType = context.getTypeSystem().getLongFactory();
return new ExtractFromRow() {
@Override