/// <summary>
/// Broadcast a dataset to n partitions.
/// </summary>
/// <typeparam name="T">The record type of the source</typeparam>
/// <param name="source">The source dataset to broadcast</param>
/// <param name="bcnt">The number of copies to broadcast</param>
/// <returns>The output dataset, each partition of which is a copy of source</returns>
public static IQueryable <T> BroadCast <T>(this IQueryable <T> source, int bcnt)
{
var dummy = source.ApplyPerPartition(x => DryadLinqHelper.ValueZero(x))
.HashPartition(x => x, bcnt);
return(dummy.ApplyPerPartition(source, (x, y) => y, true));
}
CheckOrderBy <TSource, TKey>(this IQueryable <TSource> source,
Expression <Func <TSource, TKey> > keySelector,
IComparer <TKey> comparer,
bool isDescending)
{
return(source.ApplyPerPartition(x_1 => DryadLinqHelper.CheckSort(x_1, keySelector, comparer, isDescending)));
}
CrossProduct <T1, T2, T3>(this IQueryable <T1> source1,
IQueryable <T2> source2,
Expression <Func <T1, T2, T3> > procFunc)
{
return(source1.ApplyPerPartition(source2, (x_1, y_1) => DryadLinqHelper.Cross(x_1, y_1, procFunc), true));
}
