/// <summary>
/// Utility to take a cursor, and get a shuffled version of this cursor.
/// </summary>
public static IRowCursor GetShuffledCursor(IChannelProvider provider, int poolRows, IRowCursor cursor, IRandom rand)
{
Contracts.CheckValue(provider, nameof(provider));
provider.CheckParam(poolRows > 0, nameof(poolRows), "Must be positive");
provider.CheckValue(cursor, nameof(cursor));
// REVIEW: In principle, we could limit this check to only active columns,
// if we extend the use of this utility.
provider.CheckParam(CanShuffleAll(cursor.Schema), nameof(cursor), "Cannot shuffle a cursor with some uncachable columns");
provider.CheckValue(rand, nameof(rand));
if (poolRows == 1)
{
return(cursor);
}
return(new RowCursor(provider, poolRows, cursor, rand));
}
