BigQuery - Enable terminating jobs from the browser

[GoogleCodeExporter]

What interface shows the new feature? [UI, CLI, REST API]
UI

What problem does the new feature solve?
We often run jobs that take 500-5000 seconds to complete. If we accidentally 
start a query, there is no way to abort it without waiting for it to finish and 
then deleting the results. It is a lot of overhead plus given that BQ limits 
the number of simultaneous job loads ("message":"Exceeded quota: too many 
concurrent query jobs for this project","reason":"quotaExceeded") this is a 
wait that we wish to avoid. 

How does it solve the problem?
Same as above. 

What are the side-effects or complications caused by this feature?
Based on how BQ is implemented, I'm not sure if this is possible. Might have 
issues with calculating cost of the query. 

If you have a sample implementation, please add a link to the source code
or running application here:

Original issue reported on code.google.com by [email protected] on 14 Apr 2014 at 3:36