Joseph Doherty
f5468d019f
Add MapOrdinal method to the IDataTransformer interface and provide a default implementation in DataTransformerBase. This enables transformers to report the mapping between transformed ordinals and source ordinals, supporting use cases like computed columns which return -1 to indicate no source ordinal. - Add MapOrdinal(int, IDataReader) to IDataTransformer interface - Add virtual MapOrdinal implementation in DataTransformerBase - Add DataTransformerBaseTests with test for default behavior