protected override Delegate GetGetterCore(IChannel ch, Row input, int iinfo, out Action disposer)
{
Host.AssertValueOrNull(ch);
Host.AssertValue(input);
Host.Assert(0 <= iinfo && iinfo < Infos.Length);
var type = _types[iinfo];
var ex = _exes[iinfo];
bool needScale = ex.Offset != 0 || ex.Scale != 1;
disposer = null;
var sourceType = InputSchema.GetColumnType(Infos[iinfo].Source);
if (sourceType.ItemType == NumberType.R4 || sourceType.ItemType == NumberType.R8)
{
return(GetterFromType <float>(input, iinfo, ex, needScale));
}
else
if (sourceType.ItemType == NumberType.U1)
{
return(GetterFromType <byte>(input, iinfo, ex, false));
}
else
{
throw Contracts.Except("We only support float or byte arrays");
}
}
public override RowMapperColumnInfo[] GetOutputColumns() => _parent.ColumnPairs.Select((x, idx) => new RowMapperColumnInfo(x.output, InputSchema.GetColumnType(ColMapNewToOld[idx]), null)).ToArray();