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I have a query activity that feeds into a javascript code activity. One of the columns of data that I am feeding from the query uses an aggregate function: count(products_purchased). I am using xtk.queryDef api to write pull the results from the query and need to figure out how to pull this column in the following javascript code:

var query = xtk.queryDef.create(

     <queryDef schema={vars.targetSchema} operation="select"

          <select>

               <node expr={count(products_purchased)} />

          </select>

     </queryDef>

).ExecuteQuery();

for each( var row in query)

     logInfo("Total products purchased: " + row.count(products_purchased));