protected override object DoEvaluate(ScriptThread thread)
{
thread.CurrentNode = this; //standard prolog
var container = thread.GetCurrentContainer();
var column = (ExportText)container.ExportedItems.Where(x => x.Name == fieldNode.AsString).FirstOrDefault();
if (column == null) {
return ExpressionHelper.ComposeAstNodeError("Fields",fieldNode);
}
return column.Text;
}