<https://databricks.com/blog/2017/04/17/query-watchdog-handling-disruptive-queries-spark-sql.html#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://databricks.com/blog/2017/04/17/query-watchdog-handling-disruptive-queries-spark-sql.html>