protected override bool MoveNextCore()
{
Ch.AssertValue(_currentCursor);
while (!_currentCursor.MoveNext())
{
// Mark the current cursor as finished.
_currentCursor.Dispose();
_currentCursor = null;
if (++_currentSourceIndex >= Sources.Length)
{
return(false);
}
var columnsNeeded = Schema.Where(col => IsColumnActive(col.Index));
_currentCursor = Sources[_currentSourceIndex].GetRowCursor(columnsNeeded);
_currentIdGetter = _currentCursor.GetIdGetter();
}
return(true);
}
public Cursor(IChannelProvider provider, PartitionedFileLoader parent, IMultiStreamSource files, IEnumerable <DataViewSchema.Column> columnsNeeded, Random rand)
: base(provider)
{
Contracts.AssertValue(parent);
Contracts.AssertValue(files);
_parent = parent;
_columnsNeeded = columnsNeeded;
_active = Utils.BuildArray(Schema.Count, columnsNeeded);
_subActive = _active.Take(SubColumnCount).ToArray();
_colValues = new ReadOnlyMemory <char> [Schema.Count - SubColumnCount];
_subActivecolumnsNeeded = Schema.Where(x => (_subActive?.Length > x.Index) && _subActive[x.Index]);
_subGetters = new Delegate[SubColumnCount];
_getters = CreateGetters();
_fileOrder = CreateFileOrder(rand).GetEnumerator();
}
