DSXchange

1 How do I verify the modified data from ds job to original data when I cannot quarry directly from data source due to some functionality changes I made in ds job which are not supported by that source data base quarry
2) Can I make this kind of functionalities in ds transformations?
If yes please give me one small example.

The easy thing to do is to introduce additional output links from your Transformer stages, that can capture what's coming in.

Alternately (though it's effectively the same thing) you can use stage tracing to report the data flowing into and out of the Transformer stage for each link.