// constructors internal SubqueryExpression(PigExpressionType eType, Type type, SelectExpression select) : base(eType, type) { Select = select; }
// constructors protected PigExpression(PigExpressionType eType, Type type) { _nodeType = ((ExpressionType)eType); _type = type; }
// constructors protected AliasedExpression(PigExpressionType nodeType, Type type, SourceAlias alias) : base(nodeType, type) { Alias = alias; }