title: Modify Schema in BigQuery external table (google sheets)
body: <p>Last week I created a table in <strong>BigQuery</strong> from <strong>Google Sheets</strong> with a specific schema. Now, I've added two new columns in my Spreadsheet and I'm not able to change the schema in BigQuery. How can I change it?</p>
  <p>A couple of months ago it was possible to edit it and add these columns at the end of the table, but right now there's nothing I can do in the UI when I press the 'edit schema' button.</p>