Spanner now allows privileged users to cancel long-running queries

## Feature Spanner now allows privileged users to cancel long-running queries. For more information, see [GoogleSQL Query cancellation](https://cloud.google.com/spanner/docs/reference/standard-sql/stored-procedures#query-cancellation) or [PostgreSQL Query cancellation](https://cloud.google.com/spanner/docs/reference/postgresql/stored-procedures-pg#query-cancellation). ## Feature Multiplexed sessions are now generally available. Multiplexed session is a new session management model which simplifies the pool management in clients. For more information, see [Multiplexed sessions](https://cloud.google.com/spanner/docs/sessions#multiplexed%5Fsessions).