title: SQL Bigquery returning null results even though I am using IS NOT NULL statement
body: <p>In Bigquery, I am receiving rows where the value is Null even though I have placed an IS NOT NULL statement in my query. </p>
  
  <pre><code>SELECT 
  country,
  region,
  region_name
  FROM `table`
  WHERE region_name IS NOT NULL
  AND country LIKE 'DE'
  GROUP BY 2, 3, 1
  </code></pre>
  
  <p>When I pull this however, I still receive a row where region and region name are NULL but country is not. Is there something obvious I am missing here?</p>