Add a row counter to your data

It's often useful to add a unique row identifier to your data, especially as not all data sets will have one and it provides a handy way to refer to a data record. 

You can add one easily in Dataverse using the built-in variable execCount. 

For example, in a Transform node, I can use "emit execCount as row_id" and this creates a counter in a new column called "row_id".

Reference: https://d3sa-preview.infogixsaas.com/dist/help/Default.htm#f-script/built-in-variables.htm#execCoun