title: Unable to use exact_count_distinct BigQuery aggregate function
body: <p>I am getting <strong>Resources exceeded during query execution</strong> error when I execute following query:</p>
  
  <p>SELECT EXACT_COUNT_DISTINCT( id ) FROM [bigquery-public-data:github_repos.contents]</p>
  
  <p>I used EXACT_COUNT_DISTINCT aggregate function as COUNT([DISTINCT]) function gives only a statistical approximation. </p>