Canceled indicates that the query was signaled to be canceled.

Compiling indicates that the query is in the process of executing the compiler associated with the query.

Created indicates the query has been created.

Errored indicates that there was an error when attempting to execute a query within any state inside of the controller.

Executing indicates that the query is currently executing.

Finished indicates that the query has been marked as Done and it is awaiting removal from the Controller or has already been removed.

Queueing indicates the query is waiting inside of the scheduler to be executed.

Controller provides a central location to manage all incoming queries.

Query represents a single request.

State is the query state.