/// <summary>
/// This should return true iff parallel cursors are advantageous. The default implementation
/// returns true iff some columns added by this transform are active.
/// </summary>
protected virtual bool WantParallelCursors(Func <int, bool> predicate)
{
// Prefer parallel cursors iff some of our columns are active, otherwise, don't care.
return(_bindings.AnyNewColumnsActive(predicate));
}