feat: Support For Proto Column in Spanner

package.json

@@ -37,7 +37,7 @@
     "ycsb": "node ./benchmark/ycsb.js  run -P ./benchmark/workloada -p table=usertable -p cloudspanner.instance=ycsb-instance -p operationcount=100 -p cloudspanner.database=ycsb",
     "fix": "gts fix",
     "clean": "gts clean",
-    "compile": "tsc -p . && cp -r protos build",
+    "compile": "tsc -p . && cp -r protos build && cp -r test/data build/test",
     "prepare": "npm run compile-protos && npm run compile",
     "pretest": "npm run compile",
     "presystem-test": "npm run compile",

protos/google/spanner/admin/database/v1/spanner_database_admin.proto

@@ -514,6 +514,26 @@ message CreateDatabaseRequest {
 
   // Optional. The dialect of the Cloud Spanner Database.
   DatabaseDialect database_dialect = 5 [(google.api.field_behavior) = OPTIONAL];
+
+  // Proto descriptors used by CREATE/ALTER PROTO BUNDLE statements in
+  // 'extra_statements' above.
+  // Contains a protobuf-serialized
+  // [google.protobuf.FileDescriptorSet](https://github.com/protocolbuffers/protobuf/blob/main/src/google/protobuf/descriptor.proto).
+  // To generate it, [install](https://grpc.io/docs/protoc-installation/) and
+  // run `protoc` with --include_imports and --descriptor_set_out. For example,
+  // to generate for moon/shot/app.proto, run
+  // """
+  // $protoc  --proto_path=/app_path --proto_path=/lib_path \
+  //          --include_imports \
+  //          --descriptor_set_out=descriptors.data \
+  //          moon/shot/app.proto
+  // """
+  // For more details, see protobuffer [self
+  // description](https://developers.google.com/protocol-buffers/docs/techniques#self-description).
+  // (--
+  // TODO(b/236424835) remove visibility check before launch.
+  // --)
+  bytes proto_descriptors = 6 [(google.api.field_behavior) = OPTIONAL];
 }
 
 // Metadata type for the operation returned by
@@ -585,6 +605,26 @@ message UpdateDatabaseDdlRequest {
   // [UpdateDatabaseDdl][google.spanner.admin.database.v1.DatabaseAdmin.UpdateDatabaseDdl] returns
   // `ALREADY_EXISTS`.
   string operation_id = 3;
+
+  // Proto descriptors used by CREATE/ALTER PROTO BUNDLE statements in
+  // 'extra_statements' above.
+  // Contains a protobuf-serialized
+  // [google.protobuf.FileDescriptorSet](https://github.com/protocolbuffers/protobuf/blob/main/src/google/protobuf/descriptor.proto).
+  // To generate it, [install](https://grpc.io/docs/protoc-installation/) and
+  // run `protoc` with --include_imports and --descriptor_set_out. For example,
+  // to generate for moon/shot/app.proto, run
+  // """
+  // $protoc  --proto_path=/app_path --proto_path=/lib_path \
+  //          --include_imports \
+  //          --descriptor_set_out=descriptors.data \
+  //          moon/shot/app.proto
+  // """
+  // For more details, see protobuffer [self
+  // description](https://developers.google.com/protocol-buffers/docs/techniques#self-description).
+  // (--
+  // TODO(b/236424835) remove visibility check before launch.
+  // --)
+  bytes proto_descriptors = 4 [(google.api.field_behavior) = OPTIONAL];
 }
 
 // Metadata type for the operation returned by
@@ -649,6 +689,16 @@ message GetDatabaseDdlResponse {
   // A list of formatted DDL statements defining the schema of the database
   // specified in the request.
   repeated string statements = 1;
+
+  // Proto descriptors stored in the database.
+  // Contains a protobuf-serialized
+  // [google.protobuf.FileDescriptorSet](https://github.com/protocolbuffers/protobuf/blob/main/src/google/protobuf/descriptor.proto).
+  // For more details, see protobuffer [self
+  // description](https://developers.google.com/protocol-buffers/docs/techniques#self-description).
+  // (--
+  // TODO(b/236424835) remove visibility check before launch.
+  // --)
+  bytes proto_descriptors = 2;
 }
 
 // The request for

protos/google/spanner/v1/type.proto

@@ -47,6 +47,11 @@ message Type {
   // typically is not needed to process the content of a value (it doesn't
   // affect serialization) and clients can ignore it on the read path.
   TypeAnnotationCode type_annotation = 4;
+
+  // If [code][] == [PROTO][TypeCode.PROTO] or [code][] ==
+  // [ENUM][TypeCode.ENUM], then `proto_type_fqn` is the fully qualified name of
+  // the proto type representing the proto/enum definition.
+  string proto_type_fqn = 5;
 }
 
 // `StructType` defines the fields of a [STRUCT][google.spanner.v1.TypeCode.STRUCT] type.
@@ -145,6 +150,13 @@ enum TypeCode {
   //   preserved.
   // - JSON array elements will have their order preserved.
   JSON = 11;
+
+  // Encoded as a base64-encoded `string`, as described in RFC 4648,
+  // section 4.
+  PROTO = 13;
+
+  // Encoded as `string`, in decimal format.
+  ENUM = 14;
 }
 
 // `TypeAnnotationCode` is used as a part of [Type][google.spanner.v1.Type] to