https://learn.microsoft.com/en-us/dotnet/api/microsoft.sqlserver.dts.pipeline.wrapper.idtsvirtualinputcolumn100?view=sqlserver-2019
IDTSVirtualInputColumn100 Interface (Microsoft.SqlServer.Dts.Pipeline.Wrapper) | Microsoft Learn
Represents an IDTSOutputColumn100 in the StartPoint object of an IDTSPath100 object.
interfacemicrosoftsqlserverdtspipeline