private ZipDataView(IHost host, IDataView[] sources)
{
Contracts.AssertValue(host);
_host = host;
_host.Assert(Utils.Size(sources) > 1);
_sources = sources;
_schema = new ZipSchema(_sources.Select(x => x.Schema).ToArray());
}
public Cursor(ZipDataView parent, IRowCursor[] srcCursors, Func <int, bool> predicate)
: base(parent._host)
{
Ch.AssertNonEmpty(srcCursors);
Ch.AssertValue(predicate);
_cursors = srcCursors;
_schema = parent._schema;
_isColumnActive = Utils.BuildArray(_schema.ColumnCount, predicate);
}