title: BigQuery Could not parse 'null' as int for field
body: <p>Tried to load csv files into bigquery table. There are columns where the types are INTEGER, but some missing values are NULL. So when I use the command bq load to load, got the following error:</p>
  
  <blockquote>
    <p>Could not parse 'null' as int for field</p>
  </blockquote>
  
  <p>So I am wondering what are the best solutions to deal with this, have to reprocess the data first for bq to load?</p>