title: Google Script reading from a dynamic Google Sheet
body: <p>I have a Google Script that reads from a Google Sheet. The only content of the Google Sheet is an <code>importData()</code> function that imports a CSV file. Will the <code>importData()</code> function in the Google Sheet be called every time the Google Script accesses the data in the Google Sheet? Or does the <code>importData()</code> function only get called when the Google Sheet is opened manually?</p>