title: Bigquery Cache Not Working
body: <p>I noticed that BigQuery no longer cache the same query even I have chosen to use cache in the GUI (both Alpha and Classic). I didn't edit the query at all, just keep clicking run query button and every time GUI executed the query without using cache results.</p>
  
  <p>It happens to my PHP script as well. Before, it was enable to use cache and came back with results very quick and now it executes the query every time even the same query has been executed minutes ago. I can confirm the behaviour in the logs.</p>
  
  <p>I am wondering if there is anything changed in the last few weeks? Or some kind of account level settings control this? Because it was working fine for me.</p>