title: Number of rows increased when I used UNNEST in BigQuery
body: <p>I have a orders table which contain 134537 rows I want to fetch data from this table and insert to testing table. To do the same I wrote a query and used unnest function in it which <strong>increased rows 134537 to 234832.</strong></p>
  <p>I found some <strong>duplicate rows</strong> of users orders which reflect in final result. How to handle it?</p>