public SimpleParser(PpsDataJoinExpression <TTABLE> owner, string expression)
: base(expression)
{
this.owner = owner;
} // ctor
} // func Visit
/// <summary>Visit expression part</summary>
/// <param name="expr"></param>
/// <returns></returns>
public TRESULT Visit(PpsDataJoinExpression <TTABLE> expr)
=> Visit(expr.root);
