Save in some way name of column in transformer

[sangi1981]

Hi,
I write for information.
I have a ETL, that at some point in a transformer stage makes formal checks on the data.
Data that fail these checks must be discarded.
I add some control fields in transformer.
Among these I'd like one that contains the field name for which I need to control.
Is there a way to save the name of the column in question.
Thanks

[DSguru2B]

Drag and drop, choose Derivation substitution after highlighting all the columns that have the source columns that are being tested, perform a field to grab everything after the dot (.) and surround it with quotes.
Do the above if dealing with large number of columns, for a few, just hardcode the values yourself.
Not a fancy solution but it works.

[ray.wurlod]

Do each of the checks in a separate stage variable. For each of these initialize a corresponding stage variable to contain the name of the column or columns that are the subject of the test. Use that on the output link that captures failed rows.

[sangi1981]

I had also thought about a similar solution, using the stage variables.
I was hoping, instead, that the column metadata of the stream were intercepted in some way, rather than enhance them by hand.
This can be considered a workaround.
Thanks