/// <summary>
/// A parallel query that returns a List from an sequence of values.
/// </summary>
/// <typeparam name="TSource">The type of the elements of source.</typeparam>
/// <param name="query">The query to create a List from.</param>
/// <returns>A parallel query that contains elements from the input sequence in a List form.</returns>
public static IParallelQueryExpr <List <TSource> > ToList <TSource>(this IParallelQueryExpr <IEnumerable <TSource> > query)
{
return(new ParallelQueryExpr <List <TSource> >(QExpr.NewToList(query.Expr)));
}