/// <summary>
/// Creates a new query that filters in parallel a sequence of values based on a predicate.
/// </summary>
/// <typeparam name="TSource">The type of the elements of source.</typeparam>
/// <param name="query">An query whose values to filter.</param>
/// <param name="predicate">A function to test each element for a condition.</param>
/// <returns>A parallel query that contains elements from the input query that satisfy the condition.</returns>
public static IParallelQueryExpr <IEnumerable <TSource> > Where <TSource>(this IParallelQueryExpr <IEnumerable <TSource> > query, Expression <Func <TSource, bool> > predicate)
{
return(new ParallelQueryExpr <IEnumerable <TSource> >(QExpr.NewFilter(predicate, query.Expr)));
}
