feat(spanner): add DdlStatementActionInfo and add actions to UpdateDatabaseDdlMetadata

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

@@ -676,6 +676,27 @@ message UpdateDatabaseDdlRequest {
   string operation_id = 3;
 }
 
+// Action information extracted from a DDL statement. This proto is used to
+// display the brief info of the DDL statement for the operation
+// [UpdateDatabaseDdl][google.spanner.admin.database.v1.DatabaseAdmin.UpdateDatabaseDdl].
+message DdlStatementActionInfo {
+  // The action for the DDL statement, e.g. CREATE, ALTER, DROP, GRANT, etc.
+  // This field is a non-empty string.
+  string action = 1;
+
+  // The entity type for the DDL statement, e.g. TABLE, INDEX, VIEW, etc.
+  // This field can be empty string for some DDL statement,
+  // e.g. for statement "ANALYZE", `entity_type` = "".
+  string entity_type = 2;
+
+  // The entity name(s) being operated on the DDL statement.
+  // E.g.
+  // 1. For statement "CREATE TABLE t1(...)", `entity_names` = ["t1"].
+  // 2. For statement "GRANT ROLE r1, r2 ...", `entity_names` = ["r1", "r2"].
+  // 3. For statement "ANALYZE", `entity_names` = [].
+  repeated string entity_names = 3;
+}
+
 // Metadata type for the operation returned by
 // [UpdateDatabaseDdl][google.spanner.admin.database.v1.DatabaseAdmin.UpdateDatabaseDdl].
 message UpdateDatabaseDdlMetadata {
@@ -693,20 +714,23 @@ message UpdateDatabaseDdlMetadata {
   // timestamp for the statement `statements[i]`.
   repeated google.protobuf.Timestamp commit_timestamps = 3;
 
-  // Output only. When true, indicates that the operation is throttled e.g
+  // Output only. When true, indicates that the operation is throttled e.g.
   // due to resource constraints. When resources become available the operation
   // will resume and this field will be false again.
   bool throttled = 4 [(google.api.field_behavior) = OUTPUT_ONLY];
 
   // The progress of the
-  // [UpdateDatabaseDdl][google.spanner.admin.database.v1.DatabaseAdmin.UpdateDatabaseDdl] operations.
-  // Currently, only index creation statements will have a continuously
-  // updating progress.
-  // For non-index creation statements, `progress[i]` will have start time
-  // and end time populated with commit timestamp of operation,
-  // as well as a progress of 100% once the operation has completed.
-  // `progress[i]` is the operation progress for `statements[i]`.
+  // [UpdateDatabaseDdl][google.spanner.admin.database.v1.DatabaseAdmin.UpdateDatabaseDdl]
+  // operations. All DDL statements will have continuously updating progress,
+  // and `progress[i]` is the operation progress for `statements[i]`. Also,
+  // `progress[i]` will have start time and end time populated with commit
+  // timestamp of operation, as well as a progress of 100% once the operation
+  // has completed.
   repeated OperationProgress progress = 5;
+
+  // The brief action info for the DDL statements.
+  // `actions[i]` is the brief info for `statements[i]`.
+  repeated DdlStatementActionInfo actions = 6;
 }
 
 // The request for [DropDatabase][google.spanner.admin.database.v1.DatabaseAdmin.DropDatabase].