/// <inheritdoc/>
protected override Provider VisitCalculate(CalculateProvider provider)
{
OnRecursionEntrance(provider);
var source = VisitCompilable(provider.Source);
OnRecursionExit(provider);
var translated = false;
var descriptors = new List <CalculatedColumnDescriptor>(provider.CalculatedColumns.Length);
foreach (var column in provider.CalculatedColumns)
{
var expression = translate(provider, column.Expression);
if (expression != column.Expression)
{
translated = true;
}
var ccd = new CalculatedColumnDescriptor(column.Name, column.Type, (Expression <Func <Tuple, object> >)expression);
descriptors.Add(ccd);
}
if (!translated && source == provider.Source)
{
return(provider);
}
return(new CalculateProvider(source, descriptors.ToArray()));
}
/// <summary> /// Visits <see cref="CalculateProvider"/>. /// </summary> /// <param name="provider">Calculate provider.</param> protected abstract Provider VisitCalculate(CalculateProvider provider);