A very basic question: how to get the third field name of a specific row

[aborruso]

Hi,
I know that the names of record fields depend on the contents of your input data stream, and their values change from one record to the next, and I know especially that I must study and understand DSL.

But I have now idea on how to get the key name of the third field of the second row.

Thank you

[aborruso]

I needed this info to reply to this question and I think I found a solution (probably not very elegant)