| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| github.com/golang/protobuf/proto | Package proto provides functionality for handling protocol buffer messages. |
| github.com/googleapis/gax-go/v2 | Package gax contains a set of modules which aid the development of APIs for clients and servers based on gRPC and Google API conventions. |
| google.golang.org/api/iterator | |
| google.golang.org/api/option | |
| google.golang.org/api/transport | |
| google.golang.org/genproto/googleapis/spanner/v1 | Package spanner aliases all exported identifiers in package "cloud.google.com/go/spanner/apiv1/spannerpb". |
| google.golang.org/grpc | Package grpc implements an RPC system called gRPC. |
| google.golang.org/grpc/codes | Package codes defines the canonical error codes used by gRPC. |
| google.golang.org/grpc/metadata | Package metadata define the structure of the metadata supported by gRPC library. |
| math | Package math provides basic constants and mathematical functions. |
| runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| time | Package time provides functionality for measuring and displaying time. |
| unicode | Package unicode provides data and functions to test some properties of Unicode code points. |