cloud_executor.proto

// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package google.spanner.executor.v1;

import "google/api/client.proto";
import "google/api/field_behavior.proto";
import "google/longrunning/operations.proto";
import "google/protobuf/timestamp.proto";
import "google/rpc/status.proto";
import "google/spanner/admin/database/v1/backup.proto";
import "google/spanner/admin/database/v1/common.proto";
import "google/spanner/admin/database/v1/spanner_database_admin.proto";
import "google/spanner/admin/instance/v1/spanner_instance_admin.proto";
import "google/spanner/v1/spanner.proto";
import "google/spanner/v1/type.proto";

option go_package = "cloud.google.com/go/spanner/executor/apiv1/executorpb;executorpb";
option java_multiple_files = true;
option java_outer_classname = "CloudExecutorProto";
option java_package = "com.google.spanner.executor.v1";

// Service that executes SpannerActions asynchronously.
service SpannerExecutorProxy {
  option (google.api.default_host) = "spanner-cloud-executor.googleapis.com";

  // ExecuteActionAsync is a streaming call that starts executing a new Spanner
  // action.
  //
  // For each request, the server will reply with one or more responses, but
  // only the last response will contain status in the outcome.
  //
  // Responses can be matched to requests by action_id. It is allowed to have
  // multiple actions in flight--in that case, actions are be executed in
  // parallel.
  rpc ExecuteActionAsync(stream SpannerAsyncActionRequest)
      returns (stream SpannerAsyncActionResponse) {}
}

// Request to executor service that start a new Spanner action.
message SpannerAsyncActionRequest {
  // Action id to uniquely identify this action request.
  int32 action_id = 1;

  // The actual SpannerAction to perform.
  SpannerAction action = 2;
}

// Response from executor service.
message SpannerAsyncActionResponse {
  // Action id corresponds to the request.
  int32 action_id = 1;

  // If action results are split into multiple responses, only the last response
  // can and should contain status.
  SpannerActionOutcome outcome = 2;
}

// SpannerAction defines a primitive action that can be performed against
// Spanner, such as begin or commit a transaction, or perform a read or
// mutation.
message SpannerAction {
  // Database against which to perform action.
  // In a context where a series of actions take place, an action may omit
  // database path if it applies to the same database as the previous action.
  string database_path = 1;

  // Configuration options for Spanner backend
  SpannerOptions spanner_options = 2;

  // Action represents a spanner action kind, there will only be one action kind
  // per SpannerAction.
  oneof action {
    // Action to start a transaction.
    StartTransactionAction start = 10;

    // Action to finish a transaction.
    FinishTransactionAction finish = 11;

    // Action to do a normal read.
    ReadAction read = 20;

    // Action to do a query.
    QueryAction query = 21;

    // Action to buffer a mutation.
    MutationAction mutation = 22;

    // Action to a DML.
    DmlAction dml = 23;

    // Action to a batch DML.
    BatchDmlAction batch_dml = 24;

    // Action to write a mutation.
    WriteMutationsAction write = 25;

    // Action to a partitioned update.
    PartitionedUpdateAction partitioned_update = 27;

    // Action that contains any administrative operation, like database,
    // instance manipulation.
    AdminAction admin = 30;

    // Action to start a batch transaction.
    StartBatchTransactionAction start_batch_txn = 40;

    // Action to close a batch transaction.
    CloseBatchTransactionAction close_batch_txn = 41;

    // Action to generate database partitions for batch read.
    GenerateDbPartitionsForReadAction generate_db_partitions_read = 42;

    // Action to generate database partitions for batch query.
    GenerateDbPartitionsForQueryAction generate_db_partitions_query = 43;

    // Action to execute batch actions on generated partitions.
    ExecutePartitionAction execute_partition = 44;

    // Action to execute change stream query.
    ExecuteChangeStreamQuery execute_change_stream_query = 50;
  }
}

// A single read request.
message ReadAction {
  // The table to read at.
  string table = 1;

  // The index to read at if it's an index read.
  optional string index = 2;

  // List of columns must begin with the key columns used for the read.
  repeated string column = 3;

  // Keys for performing this read.
  KeySet keys = 4;

  // Limit on number of rows to read. If set, must be positive.
  int32 limit = 5;
}

// A SQL query request.
message QueryAction {
  // Parameter that bind to placeholders in the SQL string
  message Parameter {
    // Name of the parameter (with no leading @).
    string name = 1;

    // Type of the parameter.
    google.spanner.v1.Type type = 2;

    // Value of the parameter.
    Value value = 3;
  }

  // The SQL string.
  string sql = 1;

  // Parameters for the SQL string.
  repeated Parameter params = 2;
}

// A single DML statement.
message DmlAction {
  // DML statement.
  QueryAction update = 1;

  // Whether to autocommit the transaction after executing the DML statement,
  // if the Executor supports autocommit.
  optional bool autocommit_if_supported = 2;
}

// Batch of DML statements invoked using batched execution.
message BatchDmlAction {
  // DML statements.
  repeated QueryAction updates = 1;
}

// Value represents a single value that can be read or written to/from
// Spanner.
message Value {
  // Exactly one of the following fields will be present.
  oneof value_type {
    // If is_null is set, then this value is null.
    bool is_null = 1;

    // Int type value. It's used for all integer number types, like int32 and
    // int64.
    int64 int_value = 2;

    // Bool type value.
    bool bool_value = 3;

    // Double type value. It's used for all float point types, like float and
    // double.
    double double_value = 4;

    // Bytes type value, stored in CORD. It's also used for PROTO type value.
    bytes bytes_value = 5;

    // String type value, stored in CORD.
    string string_value = 6;

    // Struct type value. It contains a ValueList representing the values in
    // this struct.
    ValueList struct_value = 7;

    // Timestamp type value.
    google.protobuf.Timestamp timestamp_value = 8;

    // Date type value. Date is specified as a number of days since Unix epoch.
    int32 date_days_value = 9;

    // If set, holds the sentinel value for the transaction CommitTimestamp.
    bool is_commit_timestamp = 10;

    // Array type value. The underlying Valuelist should have values that have
    // the same type.
    ValueList array_value = 11;
  }

  // Type of array element. Only set if value is an array.
  optional google.spanner.v1.Type array_type = 12;
}

// KeyRange represents a range of rows in a table or index.
//
// A range has a start key and an end key. These keys can be open or
// closed, indicating if the range includes rows with that key.
//
// Keys are represented by "ValueList", where the ith value in the list
// corresponds to the ith component of the table or index primary key.
message KeyRange {
  // Type controls whether "start" and "limit" are open or closed. By default,
  // "start" is closed, and "limit" is open.
  enum Type {
    // "TYPE_UNSPECIFIED" is equivalent to "CLOSED_OPEN".
    TYPE_UNSPECIFIED = 0;

    // [start,limit]
    CLOSED_CLOSED = 1;

    // [start,limit)
    CLOSED_OPEN = 2;

    // (start,limit]
    OPEN_CLOSED = 3;

    // (start,limit)
    OPEN_OPEN = 4;
  }

  // "start" and "limit" must have the same number of key parts,
  // though they may name only a prefix of the table or index key.
  // The start key of this KeyRange.
  ValueList start = 1;

  // The end key of this KeyRange.
  ValueList limit = 2;

  // "start" and "limit" type for this KeyRange.
  optional Type type = 3;
}

// KeySet defines a collection of Spanner keys and/or key ranges. All
// the keys are expected to be in the same table. The keys need not be
// sorted in any particular way.
message KeySet {
  // A list of specific keys. Entries in "keys" should have exactly as
  // many elements as there are columns in the primary or index key
  // with which this "KeySet" is used.
  repeated ValueList point = 1;

  // A list of key ranges.
  repeated KeyRange range = 2;

  // For convenience "all" can be set to "true" to indicate that this
  // "KeySet" matches all keys in the table or index. Note that any keys
  // specified in "keys" or "ranges" are only yielded once.
  bool all = 3;
}

// List of values.
message ValueList {
  // Values contained in this ValueList.
  repeated Value value = 1;
}

// A single mutation request.
message MutationAction {
  // Arguments to Insert, InsertOrUpdate, and Replace operations.
  message InsertArgs {
    // The names of the columns to be written.
    repeated string column = 1;

    // Type information for the "values" entries below.
    repeated google.spanner.v1.Type type = 2;

    // The values to be written.
    repeated ValueList values = 3;
  }

  // Arguments to Update.
  message UpdateArgs {
    // The columns to be updated. Identical to InsertArgs.column.
    repeated string column = 1;

    // Type information for "values". Identical to InsertArgs.type.
    repeated google.spanner.v1.Type type = 2;

    // The values to be updated. Identical to InsertArgs.values.
    repeated ValueList values = 3;
  }

  // Mod represents the write action that will be perform to a table. Each mod
  // will specify exactly one action, from insert, update, insert_or_update,
  // replace and delete.
  message Mod {
    // The table to write.
    string table = 1;

    // Exactly one of the remaining elements may be present.
    // Insert new rows into "table".
    InsertArgs insert = 2;

    // Update columns stored in existing rows of "table".
    UpdateArgs update = 3;

    // Insert or update existing rows of "table".
    InsertArgs insert_or_update = 4;

    // Replace existing rows of "table".
    InsertArgs replace = 5;

    // Delete rows from "table".
    KeySet delete_keys = 6;
  }

  // Mods that contained in this mutation.
  repeated Mod mod = 1;
}

// WriteMutationAction defines an action of flushing the mutation so they
// are visible to subsequent operations in the transaction.
message WriteMutationsAction {
  // The mutation to write.
  MutationAction mutation = 1;
}

// PartitionedUpdateAction defines an action to execute a partitioned DML
// which runs different partitions in parallel.
message PartitionedUpdateAction {
  message ExecutePartitionedUpdateOptions {
    // RPC Priority
    optional google.spanner.v1.RequestOptions.Priority rpc_priority = 1;

    // Transaction tag
    optional string tag = 2;
  }

  // Options for partitioned update.
  optional ExecutePartitionedUpdateOptions options = 1;

  // Partitioned dml query.
  QueryAction update = 2;
}

// StartTransactionAction defines an action of initializing a transaction.
message StartTransactionAction {
  // Concurrency is for read-only transactions and must be omitted for
  // read-write transactions.
  optional Concurrency concurrency = 1;

  // Metadata about tables and columns that will be involved in this
  // transaction. It is to convert values of key parts correctly.
  repeated TableMetadata table = 2;

  // Transaction_seed contains workid and op pair for this transaction, used for
  // testing.
  string transaction_seed = 3;

  // Execution options (e.g., whether transaction is opaque, optimistic).
  optional TransactionExecutionOptions execution_options = 4;
}

// Concurrency for read-only transactions.
message Concurrency {
  // Concurrency mode set for read-only transactions, exactly one mode below
  // should be set.
  oneof concurrency_mode {
    // Indicates a read at a consistent timestamp that is specified relative to
    // now. That is, if the caller has specified an exact staleness of s
    // seconds, we will read at now - s.
    double staleness_seconds = 1;

    // Indicates a boundedly stale read that reads at a timestamp >= T.
    int64 min_read_timestamp_micros = 2;

    // Indicates a boundedly stale read that is at most N seconds stale.
    double max_staleness_seconds = 3;

    // Indicates a read at a consistent timestamp.
    int64 exact_timestamp_micros = 4;

    // Indicates a strong read, must only be set to true, or unset.
    bool strong = 5;

    // Indicates a batch read, must only be set to true, or unset.
    bool batch = 6;
  }

  // True if exact_timestamp_micros is set, and the chosen timestamp is that of
  // a snapshot epoch.
  bool snapshot_epoch_read = 7;

  // If set, this is a snapshot epoch read constrained to read only the
  // specified log scope root table, and its children. Will not be set for full
  // database epochs.
  string snapshot_epoch_root_table = 8;

  // Set only when batch is true.
  int64 batch_read_timestamp_micros = 9;
}

// TableMetadata contains metadata of a single table.
message TableMetadata {
  // Table name.
  string name = 1;

  // Columns, in the same order as in the schema.
  repeated ColumnMetadata column = 2;

  // Keys, in order. Column name is currently not populated.
  repeated ColumnMetadata key_column = 3;
}

// ColumnMetadata represents metadata of a single column.
message ColumnMetadata {
  // Column name.
  string name = 1;

  // Column type.
  google.spanner.v1.Type type = 2;
}

// Options for executing the transaction.
message TransactionExecutionOptions {
  // Whether optimistic concurrency should be used to execute this transaction.
  bool optimistic = 1;
}

// FinishTransactionAction defines an action of finishing a transaction.
message FinishTransactionAction {
  // Mode indicates how the transaction should be finished.
  enum Mode {
    // "MODE_UNSPECIFIED" is equivalent to "COMMIT".
    MODE_UNSPECIFIED = 0;

    // Commit the transaction.
    COMMIT = 1;

    // Drop the transaction without committing it.
    ABANDON = 2;
  }

  // Defines how exactly the transaction should be completed, e.g. with
  // commit or abortion.
  Mode mode = 1;
}

// AdminAction defines all the cloud spanner admin actions, including
// instance/database admin ops, backup ops and operation actions.
message AdminAction {
  // Exactly one of the actions below will be performed in AdminAction.
  oneof action {
    // Action that creates a user instance config.
    CreateUserInstanceConfigAction create_user_instance_config = 1;

    // Action that updates a user instance config.
    UpdateUserInstanceConfigAction update_user_instance_config = 2;

    // Action that deletes a user instance config.
    DeleteUserInstanceConfigAction delete_user_instance_config = 3;

    // Action that gets a user instance config.
    GetCloudInstanceConfigAction get_cloud_instance_config = 4;

    // Action that lists user instance configs.
    ListCloudInstanceConfigsAction list_instance_configs = 5;

    // Action that creates a Cloud Spanner instance.
    CreateCloudInstanceAction create_cloud_instance = 6;

    // Action that updates a Cloud Spanner instance.
    UpdateCloudInstanceAction update_cloud_instance = 7;

    // Action that deletes a Cloud Spanner instance.
    DeleteCloudInstanceAction delete_cloud_instance = 8;

    // Action that lists Cloud Spanner instances.
    ListCloudInstancesAction list_cloud_instances = 9;

    // Action that retrieves a Cloud Spanner instance.
    GetCloudInstanceAction get_cloud_instance = 10;

    // Action that creates a Cloud Spanner database.
    CreateCloudDatabaseAction create_cloud_database = 11;

    // Action that updates the schema of a Cloud Spanner database.
    UpdateCloudDatabaseDdlAction update_cloud_database_ddl = 12;

    // Action that updates the schema of a Cloud Spanner database.
    UpdateCloudDatabaseAction update_cloud_database = 27;

    // Action that drops a Cloud Spanner database.
    DropCloudDatabaseAction drop_cloud_database = 13;

    // Action that lists Cloud Spanner databases.
    ListCloudDatabasesAction list_cloud_databases = 14;

    // Action that lists Cloud Spanner database operations.
    ListCloudDatabaseOperationsAction list_cloud_database_operations = 15;

    // Action that restores a Cloud Spanner database from a backup.
    RestoreCloudDatabaseAction restore_cloud_database = 16;

    // Action that gets a Cloud Spanner database.
    GetCloudDatabaseAction get_cloud_database = 17;

    // Action that creates a Cloud Spanner database backup.
    CreateCloudBackupAction create_cloud_backup = 18;

    // Action that copies a Cloud Spanner database backup.
    CopyCloudBackupAction copy_cloud_backup = 19;

    // Action that gets a Cloud Spanner database backup.
    GetCloudBackupAction get_cloud_backup = 20;

    // Action that updates a Cloud Spanner database backup.
    UpdateCloudBackupAction update_cloud_backup = 21;

    // Action that deletes a Cloud Spanner database backup.
    DeleteCloudBackupAction delete_cloud_backup = 22;

    // Action that lists Cloud Spanner database backups.
    ListCloudBackupsAction list_cloud_backups = 23;

    // Action that lists Cloud Spanner database backup operations.
    ListCloudBackupOperationsAction list_cloud_backup_operations = 24;

    // Action that gets an operation.
    GetOperationAction get_operation = 25;

    // Action that cancels an operation.
    CancelOperationAction cancel_operation = 26;

    // Action that changes quorum of a Cloud Spanner database.
    ChangeQuorumCloudDatabaseAction change_quorum_cloud_database = 28;
  }
}

// Action that creates a user instance config.
message CreateUserInstanceConfigAction {
  // User instance config ID (not path), e.g. "custom-config".
  string user_config_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;

  // Base config ID, e.g. "test-config".
  string base_config_id = 3;

  // Replicas that should be included in the user config.
  repeated google.spanner.admin.instance.v1.ReplicaInfo replicas = 4;
}

// Action that updates a user instance config.
message UpdateUserInstanceConfigAction {
  // User instance config ID (not path), e.g. "custom-config".
  string user_config_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;

  // The descriptive name for this instance config as it appears in UIs.
  optional string display_name = 3;

  // labels.
  map<string, string> labels = 4;
}

// Action that gets a user instance config.
message GetCloudInstanceConfigAction {
  // Instance config ID (not path), e.g. "custom-config".
  string instance_config_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;
}

// Action that deletes a user instance configs.
message DeleteUserInstanceConfigAction {
  // User instance config ID (not path), e.g. "custom-config".
  string user_config_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;
}

// Action that lists user instance configs.
message ListCloudInstanceConfigsAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Number of instance configs to be returned in the response. If 0 or
  // less, defaults to the server's maximum allowed page size.
  optional int32 page_size = 2;

  // If non-empty, "page_token" should contain a next_page_token
  // from a previous ListInstanceConfigsResponse to the same "parent".
  optional string page_token = 3;
}

// Action that creates a Cloud Spanner instance.
message CreateCloudInstanceAction {
  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;

  // Instance config ID, e.g. "test-config".
  string instance_config_id = 3;

  // Number of nodes (processing_units should not be set or set to 0 if used).
  optional int32 node_count = 4;

  // Number of processing units (node_count should be set to 0 if used).
  optional int32 processing_units = 6;

  // The autoscaling config for this instance. If non-empty, an autoscaling
  // instance will be created (processing_units and node_count should be set to
  // 0 if used).
  optional google.spanner.admin.instance.v1.AutoscalingConfig
      autoscaling_config = 7;

  // labels.
  map<string, string> labels = 5;
}

// Action that updates a Cloud Spanner instance.
message UpdateCloudInstanceAction {
  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;

  // The descriptive name for this instance as it appears in UIs.
  // Must be unique per project and between 4 and 30 characters in length.
  optional string display_name = 3;

  // The number of nodes allocated to this instance. At most one of either
  // node_count or processing_units should be present in the message.
  optional int32 node_count = 4;

  // The number of processing units allocated to this instance. At most one of
  // processing_units or node_count should be present in the message.
  optional int32 processing_units = 5;

  // The autoscaling config for this instance. If non-empty, this instance is
  // using autoscaling (processing_units and node_count should be set to
  // 0 if used).
  optional google.spanner.admin.instance.v1.AutoscalingConfig
      autoscaling_config = 7;

  // labels.
  map<string, string> labels = 6;
}

// Action that deletes a Cloud Spanner instance.
message DeleteCloudInstanceAction {
  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;
}

// Action that creates a Cloud Spanner database.
message CreateCloudDatabaseAction {
  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;

  // Cloud database ID (not full path), e.g. "db0".
  string database_id = 3;

  // SDL statements to apply to the new database.
  repeated string sdl_statement = 4;

  // The KMS key used to encrypt the database to be created if the database
  // should be CMEK protected.
  google.spanner.admin.database.v1.EncryptionConfig encryption_config = 5;

  // Optional SQL dialect (GOOGLESQL or POSTGRESQL).  Default: GOOGLESQL.
  optional string dialect = 6;

  optional bytes proto_descriptors = 7;
}

// Action that updates the schema of a Cloud Spanner database.
message UpdateCloudDatabaseDdlAction {
  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;

  // Cloud database ID (not full path), e.g. "db0".
  string database_id = 3;

  // SDL statements to apply to the database.
  repeated string sdl_statement = 4;

  // Op ID can be used to track progress of the update. If set, it must be
  // unique per database. If not set, Cloud Spanner will generate operation ID
  // automatically.
  string operation_id = 5;

  optional bytes proto_descriptors = 6;
}

// Action that updates a Cloud Spanner database.
message UpdateCloudDatabaseAction {
  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;

  // Cloud database name (not full path), e.g. "db0".
  string database_name = 3;

  // Updated value of enable_drop_protection, this is the only field that has
  // supported to be updated.
  bool enable_drop_protection = 4;
}

// Action that drops a Cloud Spanner database.
message DropCloudDatabaseAction {
  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 1;

  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 2;

  // Cloud database ID (not full path), e.g. "db0".
  string database_id = 3;
}

// Action that changes quorum of a Cloud Spanner database.
message ChangeQuorumCloudDatabaseAction {
  // The fully qualified uri of the database whose quorum has to be changed.
  optional string database_uri = 1;

  // The locations of the serving regions, e.g. "asia-south1".
  repeated string serving_locations = 2;
}

// Action that lists Cloud Spanner databases.
message ListCloudDatabasesAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path) to list databases from, e.g. "test-instance".
  string instance_id = 2;

  // Number of databases to be returned in the response. If 0 or
  // less, defaults to the server's maximum allowed page size.
  int32 page_size = 3;

  // If non-empty, "page_token" should contain a next_page_token
  // from a previous ListDatabasesResponse to the same "parent"
  // and with the same "filter".
  string page_token = 4;
}

// Action that lists Cloud Spanner databases.
message ListCloudInstancesAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // A filter expression that filters what operations are returned in the
  // response.
  // The expression must specify the field name, a comparison operator,
  // and the value that you want to use for filtering.
  // Refer spanner_instance_admin.proto.ListInstancesRequest for
  // detail.
  optional string filter = 2;

  // Number of instances to be returned in the response. If 0 or
  // less, defaults to the server's maximum allowed page size.
  optional int32 page_size = 3;

  // If non-empty, "page_token" should contain a next_page_token
  // from a previous ListInstancesResponse to the same "parent"
  // and with the same "filter".
  optional string page_token = 4;
}

// Action that retrieves a Cloud Spanner instance.
message GetCloudInstanceAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path) to retrieve the instance from,
  // e.g. "test-instance".
  string instance_id = 2;
}

// Action that lists Cloud Spanner database operations.
message ListCloudDatabaseOperationsAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path) to list database operations from,
  // e.g. "test-instance".
  string instance_id = 2;

  // A filter expression that filters what operations are returned in the
  // response.
  // The expression must specify the field name, a comparison operator,
  // and the value that you want to use for filtering.
  // Refer spanner_database_admin.proto.ListDatabaseOperationsRequest for
  // detail.
  string filter = 3;

  // Number of databases to be returned in the response. If 0 or
  // less, defaults to the server's maximum allowed page size.
  int32 page_size = 4;

  // If non-empty, "page_token" should contain a next_page_token
  // from a previous ListDatabaseOperationsResponse to the same "parent"
  // and with the same "filter".
  string page_token = 5;
}

// Action that restores a Cloud Spanner database from a backup.
message RestoreCloudDatabaseAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path) containing the backup, e.g. "backup-instance".
  string backup_instance_id = 2;

  // The id of the backup from which to restore, e.g. "test-backup".
  string backup_id = 3;

  // Cloud instance ID (not path) containing the database, e.g.
  // "database-instance".
  string database_instance_id = 4;

  // The id of the database to create and restore to, e.g. "db0". Note that this
  // database must not already exist.
  string database_id = 5;

  // The KMS key(s) used to encrypt the restored database to be created if the
  // restored database should be CMEK protected.
  google.spanner.admin.database.v1.EncryptionConfig encryption_config = 7;
}

// Action that gets a Cloud Spanner database.
message GetCloudDatabaseAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 2;

  // The id of the database to get, e.g. "db0".
  string database_id = 3;
}

// Action that creates a Cloud Spanner database backup.
message CreateCloudBackupAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 2;

  // The id of the backup to be created, e.g. "test-backup".
  string backup_id = 3;

  // The id of the database from which this backup was
  // created, e.g. "db0". Note that this needs to be in the
  // same instance as the backup.
  string database_id = 4;

  // Output only. The expiration time of the backup, which must be at least 6
  // hours and at most 366 days from the time the request is received.
  google.protobuf.Timestamp expire_time = 5
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // The version time of the backup, which must be within the time range of
  // [earliest_version_time, NOW], where earliest_version_time is retrieved by
  // cloud spanner frontend API (See details: go/cs-pitr-lite-design).
  optional google.protobuf.Timestamp version_time = 6;

  // The KMS key(s) used to encrypt the backup to be created if the backup
  // should be CMEK protected.
  google.spanner.admin.database.v1.EncryptionConfig encryption_config = 7;
}

// Action that copies a Cloud Spanner database backup.
message CopyCloudBackupAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 2;

  // The id of the backup to be created, e.g. "test-backup".
  string backup_id = 3;

  // The fully qualified uri of the source backup from which this
  // backup was copied. eg.
  // "projects/<project_id>/instances/<instance_id>/backups/<backup_id>".
  string source_backup = 4;

  // Output only. The expiration time of the backup, which must be at least 6
  // hours and at most 366 days from the time the request is received.
  google.protobuf.Timestamp expire_time = 5
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// Action that gets a Cloud Spanner database backup.
message GetCloudBackupAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 2;

  // The id of the backup to get, e.g. "test-backup".
  string backup_id = 3;
}

// Action that updates a Cloud Spanner database backup.
message UpdateCloudBackupAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 2;

  // The id of the backup to update, e.g. "test-backup".
  string backup_id = 3;

  // Output only. Updated value of expire_time, this is the only field
  // that supported to be updated.
  google.protobuf.Timestamp expire_time = 4
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// Action that deletes a Cloud Spanner database backup.
message DeleteCloudBackupAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path), e.g. "test-instance".
  string instance_id = 2;

  // The id of the backup to delete, e.g. "test-backup".
  string backup_id = 3;
}

// Action that lists Cloud Spanner database backups.
message ListCloudBackupsAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path) to list backups from, e.g. "test-instance".
  string instance_id = 2;

  // A filter expression that filters backups listed in the response.
  // The expression must specify the field name, a comparison operator,
  // and the value that you want to use for filtering.
  // Refer backup.proto.ListBackupsRequest for detail.
  string filter = 3;

  // Number of backups to be returned in the response. If 0 or
  // less, defaults to the server's maximum allowed page size.
  int32 page_size = 4;

  // If non-empty, "page_token" should contain a next_page_token
  // from a previous ListBackupsResponse to the same "parent"
  // and with the same "filter".
  string page_token = 5;
}

// Action that lists Cloud Spanner database backup operations.
message ListCloudBackupOperationsAction {
  // Cloud project ID, e.g. "spanner-cloud-systest".
  string project_id = 1;

  // Cloud instance ID (not path) to list backup operations from,
  // e.g. "test-instance".
  string instance_id = 2;

  // A filter expression that filters what operations are returned in the
  // response.
  // The expression must specify the field name, a comparison operator,
  // and the value that you want to use for filtering.
  // Refer backup.proto.ListBackupOperationsRequest for detail.
  string filter = 3;

  // Number of backups to be returned in the response. If 0 or
  // less, defaults to the server's maximum allowed page size.
  int32 page_size = 4;

  // If non-empty, "page_token" should contain a next_page_token
  // from a previous ListBackupOperationsResponse to the same "parent"
  // and with the same "filter".
  string page_token = 5;
}

// Action that gets an operation.
message GetOperationAction {
  // The name of the operation resource.
  string operation = 1;
}

// Action that cancels an operation.
message CancelOperationAction {
  // The name of the operation resource to be cancelled.
  string operation = 1;
}

// Starts a batch read-only transaction in executor. Successful outcomes of this
// action will contain batch_txn_id--the identificator that can be used to start
// the same transaction in other Executors to parallelize partition processing.
//
// Example of a batch read flow:
// 1. Start batch transaction with a timestamp (StartBatchTransactionAction)
// 2. Generate database partitions for a read or query
// (GenerateDbPartitionsForReadAction/GenerateDbPartitionsForQueryAction)
// 3. Call ExecutePartitionAction for some or all partitions, process rows
// 4. Clean up the transaction (CloseBatchTransactionAction).
//
// More sophisticated example, with parallel processing:
// 1. Start batch transaction with a timestamp (StartBatchTransactionAction),
// note the returned BatchTransactionId
// 2. Generate database partitions for a read or query
// (GenerateDbPartitionsForReadAction/GenerateDbPartitionsForQueryAction)
// 3. Distribute the partitions over a pool of workers, along with the
// transaction ID.
//
// In each worker:
// 4-1. StartBatchTransactionAction with the given transaction ID
// 4-2. ExecutePartitionAction for each partition it got, process read results
// 4-3. Close (not cleanup) the transaction (CloseBatchTransactionAction).
//
// When all workers are done:
// 5. Cleanup the transaction (CloseBatchTransactionAction). This can be done
// either by the last worker to finish the job, or by the main Executor that
// initialized this transaction in the first place. It is also possible to clean
// it up with a brand new Executor -- just execute StartBatchTransactionAction
// with the ID, then clean it up right away.
//
// Cleaning up is optional, but recommended.
message StartBatchTransactionAction {
  // To start a new transaction, specify an exact timestamp. Alternatively, an
  // existing batch transaction ID can be used. Either one of two must be
  // set.
  oneof param {
    // The exact timestamp to start the batch transaction.
    google.protobuf.Timestamp batch_txn_time = 1;

    // ID of a batch read-only transaction. It can be used to start the same
    // batch transaction on multiple executors and parallelize partition
    // processing.
    bytes tid = 2;
  }

  // Database role to assume while performing this action. Setting the
  // database_role will enforce additional role-based access checks on this
  // action.
  string cloud_database_role = 3;
}

// Closes or cleans up the currently opened batch read-only transaction.
//
// Once a transaction is closed, the Executor can be disposed of or used to
// start start another transaction. Closing a batch transaction in one Executor
// doesn't affect the transaction's state in other Executors that also read from
// it.
//
// When a transaction is cleaned up, it becomes globally invalid. Cleaning up is
// optional, but recommended.
message CloseBatchTransactionAction {
  // Indicates whether the transaction needs to be cleaned up.
  bool cleanup = 1;
}

// Generate database partitions for the given read. Successful outcomes will
// contain database partitions in the db_partition field.
message GenerateDbPartitionsForReadAction {
  // Read to generate partitions for.
  ReadAction read = 1;

  // Metadata related to the tables involved in the read.
  repeated TableMetadata table = 2;

  // Desired size of data in each partition. Spanner doesn't guarantee to
  // respect this value.
  optional int64 desired_bytes_per_partition = 3;

  // If set, the desired max number of partitions. Spanner doesn't guarantee to
  // respect this value.
  optional int64 max_partition_count = 4;
}

// Generate database partitions for the given query. Successful outcomes will
// contain database partitions in the db_partition field.
message GenerateDbPartitionsForQueryAction {
  // Query to generate partitions for.
  QueryAction query = 1;

  // Desired size of data in each partition. Spanner doesn't guarantee to
  // respect this value.
  optional int64 desired_bytes_per_partition = 2;
}

// Identifies a database partition generated for a particular read or query. To
// read rows from the partition, use ExecutePartitionAction.
message BatchPartition {
  // Serialized Partition instance.
  bytes partition = 1;

  // The partition token decrypted from partition.
  bytes partition_token = 2;

  // Table name is set iff the partition was generated for a read (as opposed to
  // a query).
  optional string table = 3;

  // Index name if the partition was generated for an index read.
  optional string index = 4;
}

// Performs a read or query for the given partitions. This action must be
// executed in the context of the same transaction that was used to generate
// given partitions.
message ExecutePartitionAction {
  // Batch partition to execute on.
  BatchPartition partition = 1;
}

// Execute a change stream TVF query.
message ExecuteChangeStreamQuery {
  // Name for this change stream.
  string name = 1;

  // Specifies that records with commit_timestamp greater than or equal to
  // start_time should be returned.
  google.protobuf.Timestamp start_time = 2;

  // Specifies that records with commit_timestamp less than or equal to
  // end_time should be returned.
  optional google.protobuf.Timestamp end_time = 3;

  // Specifies which change stream partition to query, based on the content of
  // child partitions records.
  optional string partition_token = 4;

  // Read options for this change stream query.
  repeated string read_options = 5;

  // Determines how frequently a heartbeat ChangeRecord will be returned in case
  // there are no transactions committed in this partition, in milliseconds.
  optional int32 heartbeat_milliseconds = 6;

  // Deadline for this change stream query, in seconds.
  optional int64 deadline_seconds = 7;

  // Database role to assume while performing this action. This should only be
  // set for cloud requests. Setting the database role will enforce additional
  // role-based access checks on this action.
  optional string cloud_database_role = 8;
}

// SpannerActionOutcome defines a result of execution of a single SpannerAction.
message SpannerActionOutcome {
  // If an outcome is split into multiple parts, status will be set only in the
  // last part.
  optional google.rpc.Status status = 1;

  // Transaction timestamp. It must be set for successful committed actions.
  optional google.protobuf.Timestamp commit_time = 2;

  // Result of a ReadAction. This field must be set for ReadActions even if
  // no rows were read.
  optional ReadResult read_result = 3;

  // Result of a Query. This field must be set for Queries even if no rows were
  // read.
  optional QueryResult query_result = 4;

  // This bit indicates that Spanner has restarted the current transaction. It
  // means that the client should replay all the reads and writes.
  // Setting it to true is only valid in the context of a read-write
  // transaction, as an outcome of a committing FinishTransactionAction.
  optional bool transaction_restarted = 5;

  // In successful StartBatchTransactionAction outcomes, this contains the ID of
  // the transaction.
  optional bytes batch_txn_id = 6;

  // Generated database partitions (result of a
  // GenetageDbPartitionsForReadAction/GenerateDbPartitionsForQueryAction).
  repeated BatchPartition db_partition = 7;

  // Result of admin related actions.
  optional AdminResult admin_result = 8;

  // Stores rows modified by query in single DML or batch DML action.
  // In case of batch DML action, stores 0 as row count of errored DML query.
  repeated int64 dml_rows_modified = 9;

  // Change stream records returned by a change stream query.
  repeated ChangeStreamRecord change_stream_records = 10;
}

// AdminResult contains admin action results, for database/backup/operation.
message AdminResult {
  // Results of cloud backup related actions.
  CloudBackupResponse backup_response = 1;

  // Results of operation related actions.
  OperationResponse operation_response = 2;

  // Results of database related actions.
  CloudDatabaseResponse database_response = 3;

  // Results of instance related actions.
  CloudInstanceResponse instance_response = 4;

  // Results of instance config related actions.
  CloudInstanceConfigResponse instance_config_response = 5;
}

// CloudBackupResponse contains results returned by cloud backup related
// actions.
message CloudBackupResponse {
  // List of backups returned by ListCloudBackupsAction.
  repeated google.spanner.admin.database.v1.Backup listed_backups = 1;

  // List of operations returned by ListCloudBackupOperationsAction.
  repeated google.longrunning.Operation listed_backup_operations = 2;

  // "next_page_token" can be sent in a subsequent list action
  // to fetch more of the matching data.
  string next_page_token = 3;

  // Backup returned by GetCloudBackupAction/UpdateCloudBackupAction.
  google.spanner.admin.database.v1.Backup backup = 4;
}

// OperationResponse contains results returned by operation related actions.
message OperationResponse {
  // List of operations returned by ListOperationsAction.
  repeated google.longrunning.Operation listed_operations = 1;

  // "next_page_token" can be sent in a subsequent list action
  // to fetch more of the matching data.
  string next_page_token = 2;

  // Operation returned by GetOperationAction.
  google.longrunning.Operation operation = 3;
}

// CloudInstanceResponse contains results returned by cloud instance related
// actions.
message CloudInstanceResponse {
  // List of instances returned by ListCloudInstancesAction.
  repeated google.spanner.admin.instance.v1.Instance listed_instances = 1;

  // "next_page_token" can be sent in a subsequent list action
  // to fetch more of the matching data.
  string next_page_token = 2;

  // Instance returned by GetCloudInstanceAction
  google.spanner.admin.instance.v1.Instance instance = 3;
}

// CloudInstanceConfigResponse contains results returned by cloud instance
// config related actions.
message CloudInstanceConfigResponse {
  // List of instance configs returned by ListCloudInstanceConfigsAction.
  repeated google.spanner.admin.instance.v1.InstanceConfig
      listed_instance_configs = 1;

  // "next_page_token" can be sent in a subsequent list action
  // to fetch more of the matching data.
  string next_page_token = 2;

  // Instance config returned by GetCloudInstanceConfigAction.
  google.spanner.admin.instance.v1.InstanceConfig instance_config = 3;
}

// CloudDatabaseResponse contains results returned by cloud database related
// actions.
message CloudDatabaseResponse {
  // List of databases returned by ListCloudDatabasesAction.
  repeated google.spanner.admin.database.v1.Database listed_databases = 1;

  // List of operations returned by ListCloudDatabaseOperationsAction.
  repeated google.longrunning.Operation listed_database_operations = 2;

  // "next_page_token" can be sent in a subsequent list action
  // to fetch more of the matching data.
  string next_page_token = 3;

  // Database returned by GetCloudDatabaseAction
  google.spanner.admin.database.v1.Database database = 4;
}

// ReadResult contains rows read.
message ReadResult {
  // Table name.
  string table = 1;

  // Index name, if read from an index.
  optional string index = 2;

  // Request index (multiread only).
  optional int32 request_index = 3;

  // Rows read. Each row is a struct with multiple fields, one for each column
  // in read result. All rows have the same type.
  repeated ValueList row = 4;

  // The type of rows read. It must be set if at least one row was read.
  optional google.spanner.v1.StructType row_type = 5;
}

// QueryResult contains result of a Query.
message QueryResult {
  // Rows read. Each row is a struct with multiple fields, one for each column
  // in read result. All rows have the same type.
  repeated ValueList row = 1;

  // The type of rows read. It must be set if at least one row was read.
  optional google.spanner.v1.StructType row_type = 2;
}

// Raw ChangeStream records.
// Encodes one of: DataChangeRecord, HeartbeatRecord, ChildPartitionsRecord
// returned from the ChangeStream API.
message ChangeStreamRecord {
  // Record represents one type of the change stream record.
  oneof record {
    // Data change record.
    DataChangeRecord data_change = 1;

    // Child partitions record.
    ChildPartitionsRecord child_partition = 2;

    // Heartbeat record.
    HeartbeatRecord heartbeat = 3;
  }
}

// ChangeStream data change record.
message DataChangeRecord {
  // Column types.
  message ColumnType {
    // Column name.
    string name = 1;

    // Column type in JSON.
    string type = 2;

    // Whether the column is a primary key column.
    bool is_primary_key = 3;

    // The position of the column as defined in the schema.
    int64 ordinal_position = 4;
  }

  // Describes the changes that were made.
  message Mod {
    // The primary key values in JSON.
    string keys = 1;

    // The new values of the changed columns in JSON. Only contain the non-key
    // columns.
    string new_values = 2;

    // The old values of the changed columns in JSON. Only contain the non-key
    // columns.
    string old_values = 3;
  }

  // The timestamp in which the change was committed.
  google.protobuf.Timestamp commit_time = 1;

  // The sequence number for the record within the transaction.
  string record_sequence = 2;

  // A globally unique string that represents the transaction in which the
  // change was committed.
  string transaction_id = 3;

  // Indicates whether this is the last record for a transaction in the current
  // partition.
  bool is_last_record = 4;

  // Name of the table affected by the change.
  string table = 5;

  // Column types defined in the schema.
  repeated ColumnType column_types = 6;

  // Changes made in the transaction.
  repeated Mod mods = 7;

  // Describes the type of change. One of INSERT, UPDATE or DELETE.
  string mod_type = 8;

  // One of value capture type: NEW_VALUES, OLD_VALUES, OLD_AND_NEW_VALUES.
  string value_capture_type = 9;

  // Number of records in transactions.
  int64 record_count = 10;

  // Number of partitions in transactions.
  int64 partition_count = 11;

  // Transaction tag info.
  string transaction_tag = 12;

  // Whether the transaction is a system transactionn.
  bool is_system_transaction = 13;
}

// ChangeStream child partition record.
message ChildPartitionsRecord {
  // A single child partition.
  message ChildPartition {
    // Partition token string used to identify the child partition in queries.
    string token = 1;

    // Parent partition tokens of this child partition.
    repeated string parent_partition_tokens = 2;
  }

  // Data change records returned from child partitions in this child partitions
  // record will have a commit timestamp greater than or equal to start_time.
  google.protobuf.Timestamp start_time = 1;

  // A monotonically increasing sequence number that can be used to define the
  // ordering of the child partitions record when there are multiple child
  // partitions records returned with the same start_time in a particular
  // partition.
  string record_sequence = 2;

  // A set of child partitions and their associated information.
  repeated ChildPartition child_partitions = 3;
}

// ChangeStream heartbeat record.
message HeartbeatRecord {
  // Timestamp for this heartbeat check.
  google.protobuf.Timestamp heartbeat_time = 1;
}

// Options for Cloud Spanner Service.
message SpannerOptions {
  // Options for configuring the session pool
  SessionPoolOptions session_pool_options = 1;
}

// Options for the session pool used by the DatabaseClient.
message SessionPoolOptions {
  // passing this as true, will make applicable RPCs use multiplexed sessions
  // instead of regular sessions
  bool use_multiplexed = 1;
}