protected override Delegate GetGetterCore(IChannel ch, IRow input, int iinfo, out Action disposer)
{
Contracts.AssertValueOrNull(ch);
Contracts.AssertValue(input);
Contracts.Assert(0 <= iinfo && iinfo < Infos.Length);
disposer = null;
int col = Infos[iinfo].Source;
var typeSrc = input.Schema.GetColumnType(col);
Contracts.Assert(RowCursorUtils.TestGetLabelGetter(typeSrc) == null);
return(RowCursorUtils.GetLabelGetter(input, col));
}