v0.21.0

• bigquery:

  • Add OpenCensus tracing.

• firestore:

  • BREAKING CHANGE: If a document does not exist, return a DocumentSnapshot
    whose Exists method returns false. DocumentRef.Get and Transaction.Get
    return the non-nil DocumentSnapshot in addition to a NotFound error.
    DocumentRef.GetAll and Transaction.GetAll return a non-nil
    DocumentSnapshot instead of nil.
  • Add DocumentIterator.Stop. Call Stop whenever you are done with a
    DocumentIterator.
  • Added Query.Snapshots and DocumentRef.Snapshots, which provide realtime
    notification of updates. See https://cloud.google.com/firestore/docs/query-data/listen.
  • Canceling an RPC now always returns a grpc.Status with codes.Canceled.

• spanner:

  • Add CommitTimestamp, which supports inserting the commit timestamp of a
    transaction into a column.