Populate Aggregate snap with Pipeline Parameter

So I’d like to use the value of a pipeline parameter as the field in the Aggregate snap.

Can this be done, and if so, how?

Specify the field name, including “$” in the pipeline parameters:

Then use the “eval()” function in the Aggregate snap:

This doesn’t set the result field name, but that can be done in a subsequent mapper if needed.

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Thanks, that worked for me.