/// <summary>
/// Creates a new parallel query that returns the number of elements in a sequence.
/// </summary>
/// <typeparam name="TSource">The type of the elements of source.</typeparam>
/// <param name="query">A query whose elements will be count.</param>
/// <returns>A parallel query that returns the number of elements in the input sequence.</returns>
public static IParallelQueryExpr <int> Count <TSource>(this IParallelQueryExpr <IEnumerable <TSource> > query)
{
return(new ParallelQueryExpr <int>(QExpr.NewCount(query.Expr)));
}
