How to make a Robust Transform Engine Glide Lookup Operation conditional?

[Steve Stivers1]

I am building a robust transform ETL definition and have it almost working.

I have the glide operation working but I need it to only run if the source field is not empty.

I see the "Is Conditional" check box and see that when I check it there is a place to enter a script. What I can't find is any documentation about what I can do in that box. How do I access the field value? What should the script return?

[Steve Stivers1]

I did a work around by using a Script Operation and this script:

 (function(batch, output) {
    for (var i = 0; i < batch.length; i++) {
        if(batch[i].input != ""){
            var grUser = new GlideRecord("sys_user");
            grUser.addQuery("name", batch[i].input);
            grUser.query();
            if(grUser.next()){
                output[i] = grUser.sys_id;
            }
        }
    }
 })(batch, output);