private ExpressionCalculator GetOnceExpressionCalculator()
 {
     if (this.onceExpressionCalculator == null)
     {
         this.onceExpressionCalculator = ExpressionCalculator.Parse(this.Table, "OnceLambdaExpression");
     }
     return(this.onceExpressionCalculator);
 }
 private ExpressionCalculator GetExpressionCalculator()
 {
     if (this.expressionCalculator == null)
     {
         this.expressionCalculator = ExpressionCalculator.Parse(this.Table);
     }
     return(this.expressionCalculator);
 }