chore: regens API reference docs (#889)

diff --git a/docs/dyn/spanner_v1.projects.instances.databases.html b/docs/dyn/spanner_v1.projects.instances.databases.html
index ac2b58f..24b2140 100644
--- a/docs/dyn/spanner_v1.projects.instances.databases.html
+++ b/docs/dyn/spanner_v1.projects.instances.databases.html
@@ -85,7 +85,7 @@
 <p class="firstline">Returns the sessions Resource.</p>
 
 <p class="toc_element">
-  <code><a href="#create">create(parent, body, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(parent, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates a new Cloud Spanner database and starts to prepare it for serving.</p>
 <p class="toc_element">
   <code><a href="#dropDatabase">dropDatabase(database, x__xgafv=None)</a></code></p>
@@ -98,7 +98,7 @@
 <p class="firstline">Returns the schema of a Cloud Spanner database as a list of formatted</p>
 <p class="toc_element">
   <code><a href="#getIamPolicy">getIamPolicy(resource, body=None, x__xgafv=None)</a></code></p>
-<p class="firstline">Gets the access control policy for a database resource.</p>
+<p class="firstline">Gets the access control policy for a database or backup resource.</p>
 <p class="toc_element">
   <code><a href="#list">list(parent, pageSize=None, pageToken=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Lists Cloud Spanner databases.</p>
@@ -106,20 +106,23 @@
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#setIamPolicy">setIamPolicy(resource, body, x__xgafv=None)</a></code></p>
-<p class="firstline">Sets the access control policy on a database resource.</p>
+  <code><a href="#restore">restore(parent, body=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Create a new database by restoring from a completed backup. The new</p>
 <p class="toc_element">
-  <code><a href="#testIamPermissions">testIamPermissions(resource, body, x__xgafv=None)</a></code></p>
-<p class="firstline">Returns permissions that the caller has on the specified database resource.</p>
+  <code><a href="#setIamPolicy">setIamPolicy(resource, body=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Sets the access control policy on a database or backup resource.</p>
 <p class="toc_element">
-  <code><a href="#updateDdl">updateDdl(database, body, x__xgafv=None)</a></code></p>
+  <code><a href="#testIamPermissions">testIamPermissions(resource, body=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Returns permissions that the caller has on the specified database or backup</p>
+<p class="toc_element">
+  <code><a href="#updateDdl">updateDdl(database, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Updates the schema of a Cloud Spanner database by</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="create">create(parent, body, x__xgafv=None)</code>
+    <code class="details" id="create">create(parent, body=None, x__xgafv=None)</code>
   <pre>Creates a new Cloud Spanner database and starts to prepare it for serving.
 The returned long-running operation will
-have a name of the format `<database_name>/operations/<operation_id>` and
+have a name of the format `&lt;database_name&gt;/operations/&lt;operation_id&gt;` and
 can be used to track preparation of the database. The
 metadata field type is
 CreateDatabaseMetadata. The
@@ -128,12 +131,12 @@
 
 Args:
   parent: string, Required. The name of the instance that will serve the new database.
-Values are of the form `projects/<project>/instances/<instance>`. (required)
-  body: object, The request body. (required)
+Values are of the form `projects/&lt;project&gt;/instances/&lt;instance&gt;`. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The request for CreateDatabase.
-    "extraStatements": [ # An optional list of DDL statements to run inside the newly created
+    "extraStatements": [ # Optional. A list of DDL statements to run inside the newly created
         # database. Statements can create tables, indexes, etc. These
         # statements execute atomically with the creation of the database:
         # if there is an error in any statement, the database is not created.
@@ -156,64 +159,13 @@
 
     { # This resource represents a long-running operation that is the result of a
       # network API call.
-    "metadata": { # Service-specific metadata associated with the operation.  It typically
-        # contains progress information and common metadata such as create time.
-        # Some services might not provide such metadata.  Any method that returns a
-        # long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
     "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
         # different programming environments, including REST APIs and RPC APIs. It is
-        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
         #
-        # - Simple to use and understand for most users
-        # - Flexible enough to meet unexpected needs
-        #
-        # # Overview
-        #
-        # The `Status` message contains three pieces of data: error code, error
-        # message, and error details. The error code should be an enum value of
-        # google.rpc.Code, but it may accept additional error codes if needed.  The
-        # error message should be a developer-facing English message that helps
-        # developers *understand* and *resolve* the error. If a localized user-facing
-        # error message is needed, put the localized message in the error details or
-        # localize it in the client. The optional error details may contain arbitrary
-        # information about the error. There is a predefined set of error detail types
-        # in the package `google.rpc` that can be used for common error conditions.
-        #
-        # # Language mapping
-        #
-        # The `Status` message is the logical representation of the error model, but it
-        # is not necessarily the actual wire format. When the `Status` message is
-        # exposed in different client libraries and different wire protocols, it can be
-        # mapped differently. For example, it will likely be mapped to some exceptions
-        # in Java, but more likely mapped to some error codes in C.
-        #
-        # # Other uses
-        #
-        # The error model and the `Status` message can be used in a variety of
-        # environments, either with or without APIs, to provide a
-        # consistent developer experience across different environments.
-        #
-        # Example uses of this error model include:
-        #
-        # - Partial errors. If a service needs to return partial errors to the client,
-        #     it may embed the `Status` in the normal response to indicate the partial
-        #     errors.
-        #
-        # - Workflow errors. A typical workflow has multiple steps. Each step may
-        #     have a `Status` message for error reporting.
-        #
-        # - Batch operations. If a client uses batch request and batch response, the
-        #     `Status` message should be used directly inside batch response, one for
-        #     each error sub-response.
-        #
-        # - Asynchronous operations. If an API call embeds asynchronous operation
-        #     results in its response, the status of those operations should be
-        #     represented directly using the `Status` message.
-        #
-        # - Logging. If some API errors are stored in logs, the message `Status` could
-        #     be used directly after any stripping needed for security/privacy reasons.
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
       "message": "A String", # A developer-facing error message, which should be in English. Any
           # user-facing error message should be localized and sent in the
           # google.rpc.Status.details field, or localized by the client.
@@ -241,12 +193,20 @@
     "name": "A String", # The server-assigned name, which is only unique within the same service that
         # originally returns it. If you use the default HTTP mapping, the
         # `name` should be a resource name ending with `operations/{unique_id}`.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
   }</pre>
 </div>
 
 <div class="method">
     <code class="details" id="dropDatabase">dropDatabase(database, x__xgafv=None)</code>
   <pre>Drops (aka deletes) a Cloud Spanner database.
+Completed backups for the database will be retained according to their
+`expire_time`.
 
 Args:
   database: string, Required. The database to be dropped. (required)
@@ -276,7 +236,7 @@
 
 Args:
   name: string, Required. The name of the requested database. Values are of the form
-`projects/<project>/instances/<instance>/databases/<database>`. (required)
+`projects/&lt;project&gt;/instances/&lt;instance&gt;/databases/&lt;database&gt;`. (required)
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format
@@ -288,10 +248,22 @@
     { # A Cloud Spanner database.
     "state": "A String", # Output only. The current database state.
     "name": "A String", # Required. The name of the database. Values are of the form
-        # `projects/<project>/instances/<instance>/databases/<database>`,
-        # where `<database>` is as specified in the `CREATE DATABASE`
+        # `projects/&lt;project&gt;/instances/&lt;instance&gt;/databases/&lt;database&gt;`,
+        # where `&lt;database&gt;` is as specified in the `CREATE DATABASE`
         # statement. This name can be passed to other API methods to
         # identify the database.
+    "createTime": "A String", # Output only. If exists, the time at which the database creation started.
+    "restoreInfo": { # Information about the database restore. # Output only. Applicable only for restored databases. Contains information
+        # about the restore source.
+      "backupInfo": { # Information about a backup. # Information about the backup used to restore the database. The backup
+          # may no longer exist.
+        "backup": "A String", # Name of the backup.
+        "createTime": "A String", # The backup contains an externally consistent copy of `source_database` at
+            # the timestamp specified by `create_time`.
+        "sourceDatabase": "A String", # Name of the database the backup was created from.
+      },
+      "sourceType": "A String", # The type of the restore source.
+    },
   }</pre>
 </div>
 
@@ -321,19 +293,32 @@
 
 <div class="method">
     <code class="details" id="getIamPolicy">getIamPolicy(resource, body=None, x__xgafv=None)</code>
-  <pre>Gets the access control policy for a database resource.
-Returns an empty policy if a database exists but does
-not have a policy set.
+  <pre>Gets the access control policy for a database or backup resource.
+Returns an empty policy if a database or backup exists but does not have a
+policy set.
 
 Authorization requires `spanner.databases.getIamPolicy` permission on
 resource.
+For backups, authorization requires `spanner.backups.getIamPolicy`
+permission on resource.
 
 Args:
-  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being retrieved. The format is `projects/<project ID>/instances/<instance ID>` for instance resources and `projects/<project ID>/instances/<instance ID>/databases/<database ID>` for database resources. (required)
+  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being retrieved. The format is `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;` for instance resources and `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;/databases/&lt;database ID&gt;` for database resources. (required)
   body: object, The request body.
     The object takes the form of:
 
 { # Request message for `GetIamPolicy` method.
+    "options": { # Encapsulates settings provided to GetIamPolicy. # OPTIONAL: A `GetPolicyOptions` object for specifying options to
+        # `GetIamPolicy`. This field is only used by Cloud IAM.
+      "requestedPolicyVersion": 42, # Optional. The policy format version to be returned.
+          #
+          # Valid values are 0, 1, and 3. Requests specifying an invalid value will be
+          # rejected.
+          #
+          # Requests for policies with any conditional bindings must specify version 3.
+          # Policies without any conditional bindings may specify any valid value or
+          # leave the field unset.
+    },
   }
 
   x__xgafv: string, V1 error format.
@@ -344,53 +329,72 @@
 Returns:
   An object of the form:
 
-    { # Defines an Identity and Access Management (IAM) policy. It is used to
-      # specify access control policies for Cloud Platform resources.
+    { # An Identity and Access Management (IAM) policy, which specifies access
+      # controls for Google Cloud resources.
       #
       #
-      # A `Policy` consists of a list of `bindings`. A `binding` binds a list of
-      # `members` to a `role`, where the members can be user accounts, Google groups,
-      # Google domains, and service accounts. A `role` is a named list of permissions
-      # defined by IAM.
+      # A `Policy` is a collection of `bindings`. A `binding` binds one or more
+      # `members` to a single `role`. Members can be user accounts, service accounts,
+      # Google groups, and domains (such as G Suite). A `role` is a named list of
+      # permissions; each `role` can be an IAM predefined role or a user-created
+      # custom role.
       #
-      # **JSON Example**
+      # Optionally, a `binding` can specify a `condition`, which is a logical
+      # expression that allows access to a resource only if the expression evaluates
+      # to `true`. A condition can add constraints based on attributes of the
+      # request, the resource, or both.
+      #
+      # **JSON example:**
       #
       #     {
       #       "bindings": [
       #         {
-      #           "role": "roles/owner",
+      #           "role": "roles/resourcemanager.organizationAdmin",
       #           "members": [
       #             "user:mike@example.com",
       #             "group:admins@example.com",
       #             "domain:google.com",
-      #             "serviceAccount:my-other-app@appspot.gserviceaccount.com"
+      #             "serviceAccount:my-project-id@appspot.gserviceaccount.com"
       #           ]
       #         },
       #         {
-      #           "role": "roles/viewer",
-      #           "members": ["user:sean@example.com"]
+      #           "role": "roles/resourcemanager.organizationViewer",
+      #           "members": ["user:eve@example.com"],
+      #           "condition": {
+      #             "title": "expirable access",
+      #             "description": "Does not grant access after Sep 2020",
+      #             "expression": "request.time &lt; timestamp('2020-10-01T00:00:00.000Z')",
+      #           }
       #         }
-      #       ]
+      #       ],
+      #       "etag": "BwWWja0YfJA=",
+      #       "version": 3
       #     }
       #
-      # **YAML Example**
+      # **YAML example:**
       #
       #     bindings:
       #     - members:
       #       - user:mike@example.com
       #       - group:admins@example.com
       #       - domain:google.com
-      #       - serviceAccount:my-other-app@appspot.gserviceaccount.com
-      #       role: roles/owner
+      #       - serviceAccount:my-project-id@appspot.gserviceaccount.com
+      #       role: roles/resourcemanager.organizationAdmin
       #     - members:
-      #       - user:sean@example.com
-      #       role: roles/viewer
-      #
+      #       - user:eve@example.com
+      #       role: roles/resourcemanager.organizationViewer
+      #       condition:
+      #         title: expirable access
+      #         description: Does not grant access after Sep 2020
+      #         expression: request.time &lt; timestamp('2020-10-01T00:00:00.000Z')
+      #     - etag: BwWWja0YfJA=
+      #     - version: 3
       #
       # For a description of IAM and its features, see the
-      # [IAM developer's guide](https://cloud.google.com/iam/docs).
-    "bindings": [ # Associates a list of `members` to a `role`.
-        # `bindings` with no members will result in an error.
+      # [IAM documentation](https://cloud.google.com/iam/docs/).
+    "bindings": [ # Associates a list of `members` to a `role`. Optionally, may specify a
+        # `condition` that determines how and when the `bindings` are applied. Each
+        # of the `bindings` must contain at least one member.
       { # Associates `members` with a `role`.
         "role": "A String", # Role that is assigned to `members`.
             # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
@@ -404,7 +408,7 @@
             #    who is authenticated with a Google account or a service account.
             #
             # * `user:{emailid}`: An email address that represents a specific Google
-            #    account. For example, `alice@gmail.com` .
+            #    account. For example, `alice@example.com` .
             #
             #
             # * `serviceAccount:{emailid}`: An email address that represents a service
@@ -413,30 +417,73 @@
             # * `group:{emailid}`: An email address that represents a Google group.
             #    For example, `admins@example.com`.
             #
+            # * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique
+            #    identifier) representing a user that has been recently deleted. For
+            #    example, `alice@example.com?uid=123456789012345678901`. If the user is
+            #    recovered, this value reverts to `user:{emailid}` and the recovered user
+            #    retains the role in the binding.
+            #
+            # * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus
+            #    unique identifier) representing a service account that has been recently
+            #    deleted. For example,
+            #    `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`.
+            #    If the service account is undeleted, this value reverts to
+            #    `serviceAccount:{emailid}` and the undeleted service account retains the
+            #    role in the binding.
+            #
+            # * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique
+            #    identifier) representing a Google group that has been recently
+            #    deleted. For example, `admins@example.com?uid=123456789012345678901`. If
+            #    the group is recovered, this value reverts to `group:{emailid}` and the
+            #    recovered group retains the role in the binding.
+            #
             #
             # * `domain:{domain}`: The G Suite domain (primary) that represents all the
             #    users of that domain. For example, `google.com` or `example.com`.
             #
           "A String",
         ],
-        "condition": { # Represents an expression text. Example: # The condition that is associated with this binding.
+        "condition": { # Represents a textual expression in the Common Expression Language (CEL) # The condition that is associated with this binding.
             # NOTE: An unsatisfied condition will not allow user access via current
             # binding. Different bindings, including their conditions, are examined
             # independently.
+            # syntax. CEL is a C-like expression language. The syntax and semantics of CEL
+            # are documented at https://github.com/google/cel-spec.
             #
-            #     title: "User account presence"
-            #     description: "Determines whether the request has a user account"
-            #     expression: "size(request.user) > 0"
-          "location": "A String", # An optional string indicating the location of the expression for error
+            # Example (Comparison):
+            #
+            #     title: "Summary size limit"
+            #     description: "Determines if a summary is less than 100 chars"
+            #     expression: "document.summary.size() &lt; 100"
+            #
+            # Example (Equality):
+            #
+            #     title: "Requestor is owner"
+            #     description: "Determines if requestor is the document owner"
+            #     expression: "document.owner == request.auth.claims.email"
+            #
+            # Example (Logic):
+            #
+            #     title: "Public documents"
+            #     description: "Determine whether the document should be publicly visible"
+            #     expression: "document.type != 'private' &amp;&amp; document.type != 'internal'"
+            #
+            # Example (Data Manipulation):
+            #
+            #     title: "Notification string"
+            #     description: "Create a notification string with a timestamp."
+            #     expression: "'New message received at ' + string(document.create_time)"
+            #
+            # The exact variables and functions that may be referenced within an expression
+            # are determined by the service that evaluates it. See the service
+            # documentation for additional information.
+          "location": "A String", # Optional. String indicating the location of the expression for error
               # reporting, e.g. a file name and a position in the file.
-          "expression": "A String", # Textual representation of an expression in
-              # Common Expression Language syntax.
-              #
-              # The application context of the containing message determines which
-              # well-known feature set of CEL is supported.
-          "description": "A String", # An optional description of the expression. This is a longer text which
+          "expression": "A String", # Textual representation of an expression in Common Expression Language
+              # syntax.
+          "description": "A String", # Optional. Description of the expression. This is a longer text which
               # describes the expression, e.g. when hovered over it in a UI.
-          "title": "A String", # An optional title for the expression, i.e. a short string describing
+          "title": "A String", # Optional. Title for the expression, i.e. a short string describing
               # its purpose. This can be used e.g. in UIs which allow to enter the
               # expression.
         },
@@ -450,9 +497,31 @@
         # systems are expected to put that etag in the request to `setIamPolicy` to
         # ensure that their change will be applied to the same version of the policy.
         #
-        # If no `etag` is provided in the call to `setIamPolicy`, then the existing
-        # policy is overwritten blindly.
-    "version": 42, # Deprecated.
+        # **Important:** If you use IAM Conditions, you must include the `etag` field
+        # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+        # you to overwrite a version `3` policy with a version `1` policy, and all of
+        # the conditions in the version `3` policy are lost.
+    "version": 42, # Specifies the format of the policy.
+        #
+        # Valid values are `0`, `1`, and `3`. Requests that specify an invalid value
+        # are rejected.
+        #
+        # Any operation that affects conditional role bindings must specify version
+        # `3`. This requirement applies to the following operations:
+        #
+        # * Getting a policy that includes a conditional role binding
+        # * Adding a conditional role binding to a policy
+        # * Changing a conditional role binding in a policy
+        # * Removing any role binding, with or without a condition, from a policy
+        #   that includes conditions
+        #
+        # **Important:** If you use IAM Conditions, you must include the `etag` field
+        # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+        # you to overwrite a version `3` policy with a version `1` policy, and all of
+        # the conditions in the version `3` policy are lost.
+        #
+        # If a policy does not include any conditions, operations on that policy may
+        # specify any valid version or leave the field unset.
   }</pre>
 </div>
 
@@ -462,7 +531,7 @@
 
 Args:
   parent: string, Required. The instance whose databases should be listed.
-Values are of the form `projects/<project>/instances/<instance>`. (required)
+Values are of the form `projects/&lt;project&gt;/instances/&lt;instance&gt;`. (required)
   pageSize: integer, Number of databases to be returned in the response. If 0 or less,
 defaults to the server's maximum allowed page size.
   pageToken: string, If non-empty, `page_token` should contain a
@@ -484,10 +553,22 @@
       { # A Cloud Spanner database.
         "state": "A String", # Output only. The current database state.
         "name": "A String", # Required. The name of the database. Values are of the form
-            # `projects/<project>/instances/<instance>/databases/<database>`,
-            # where `<database>` is as specified in the `CREATE DATABASE`
+            # `projects/&lt;project&gt;/instances/&lt;instance&gt;/databases/&lt;database&gt;`,
+            # where `&lt;database&gt;` is as specified in the `CREATE DATABASE`
             # statement. This name can be passed to other API methods to
             # identify the database.
+        "createTime": "A String", # Output only. If exists, the time at which the database creation started.
+        "restoreInfo": { # Information about the database restore. # Output only. Applicable only for restored databases. Contains information
+            # about the restore source.
+          "backupInfo": { # Information about a backup. # Information about the backup used to restore the database. The backup
+              # may no longer exist.
+            "backup": "A String", # Name of the backup.
+            "createTime": "A String", # The backup contains an externally consistent copy of `source_database` at
+                # the timestamp specified by `create_time`.
+            "sourceDatabase": "A String", # Name of the database the backup was created from.
+          },
+          "sourceType": "A String", # The type of the restore source.
+        },
       },
     ],
   }</pre>
@@ -508,344 +589,42 @@
 </div>
 
 <div class="method">
-    <code class="details" id="setIamPolicy">setIamPolicy(resource, body, x__xgafv=None)</code>
-  <pre>Sets the access control policy on a database resource.
-Replaces any existing policy.
-
-Authorization requires `spanner.databases.setIamPolicy`
-permission on resource.
+    <code class="details" id="restore">restore(parent, body=None, x__xgafv=None)</code>
+  <pre>Create a new database by restoring from a completed backup. The new
+database must be in the same project and in an instance with the same
+instance configuration as the instance containing
+the backup. The returned database long-running
+operation has a name of the format
+`projects/&lt;project&gt;/instances/&lt;instance&gt;/databases/&lt;database&gt;/operations/&lt;operation_id&gt;`,
+and can be used to track the progress of the operation, and to cancel it.
+The metadata field type is
+RestoreDatabaseMetadata.
+The response type
+is Database, if
+successful. Cancelling the returned operation will stop the restore and
+delete the database.
+There can be only one database being restored into an instance at a time.
+Once the restore operation completes, a new restore operation can be
+initiated, without waiting for the optimize operation associated with the
+first restore to complete.
 
 Args:
-  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being set. The format is `projects/<project ID>/instances/<instance ID>` for instance resources and `projects/<project ID>/instances/<instance ID>/databases/<database ID>` for databases resources. (required)
-  body: object, The request body. (required)
+  parent: string, Required. The name of the instance in which to create the
+restored database. This instance must be in the same project and
+have the same instance configuration as the instance containing
+the source backup. Values are of the form
+`projects/&lt;project&gt;/instances/&lt;instance&gt;`. (required)
+  body: object, The request body.
     The object takes the form of:
 
-{ # Request message for `SetIamPolicy` method.
-    "policy": { # Defines an Identity and Access Management (IAM) policy. It is used to # REQUIRED: The complete policy to be applied to the `resource`. The size of
-        # the policy is limited to a few 10s of KB. An empty policy is a
-        # valid policy but certain Cloud Platform services (such as Projects)
-        # might reject them.
-        # specify access control policies for Cloud Platform resources.
-        #
-        #
-        # A `Policy` consists of a list of `bindings`. A `binding` binds a list of
-        # `members` to a `role`, where the members can be user accounts, Google groups,
-        # Google domains, and service accounts. A `role` is a named list of permissions
-        # defined by IAM.
-        #
-        # **JSON Example**
-        #
-        #     {
-        #       "bindings": [
-        #         {
-        #           "role": "roles/owner",
-        #           "members": [
-        #             "user:mike@example.com",
-        #             "group:admins@example.com",
-        #             "domain:google.com",
-        #             "serviceAccount:my-other-app@appspot.gserviceaccount.com"
-        #           ]
-        #         },
-        #         {
-        #           "role": "roles/viewer",
-        #           "members": ["user:sean@example.com"]
-        #         }
-        #       ]
-        #     }
-        #
-        # **YAML Example**
-        #
-        #     bindings:
-        #     - members:
-        #       - user:mike@example.com
-        #       - group:admins@example.com
-        #       - domain:google.com
-        #       - serviceAccount:my-other-app@appspot.gserviceaccount.com
-        #       role: roles/owner
-        #     - members:
-        #       - user:sean@example.com
-        #       role: roles/viewer
-        #
-        #
-        # For a description of IAM and its features, see the
-        # [IAM developer's guide](https://cloud.google.com/iam/docs).
-      "bindings": [ # Associates a list of `members` to a `role`.
-          # `bindings` with no members will result in an error.
-        { # Associates `members` with a `role`.
-          "role": "A String", # Role that is assigned to `members`.
-              # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
-          "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
-              # `members` can have the following values:
-              #
-              # * `allUsers`: A special identifier that represents anyone who is
-              #    on the internet; with or without a Google account.
-              #
-              # * `allAuthenticatedUsers`: A special identifier that represents anyone
-              #    who is authenticated with a Google account or a service account.
-              #
-              # * `user:{emailid}`: An email address that represents a specific Google
-              #    account. For example, `alice@gmail.com` .
-              #
-              #
-              # * `serviceAccount:{emailid}`: An email address that represents a service
-              #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
-              #
-              # * `group:{emailid}`: An email address that represents a Google group.
-              #    For example, `admins@example.com`.
-              #
-              #
-              # * `domain:{domain}`: The G Suite domain (primary) that represents all the
-              #    users of that domain. For example, `google.com` or `example.com`.
-              #
-            "A String",
-          ],
-          "condition": { # Represents an expression text. Example: # The condition that is associated with this binding.
-              # NOTE: An unsatisfied condition will not allow user access via current
-              # binding. Different bindings, including their conditions, are examined
-              # independently.
-              #
-              #     title: "User account presence"
-              #     description: "Determines whether the request has a user account"
-              #     expression: "size(request.user) > 0"
-            "location": "A String", # An optional string indicating the location of the expression for error
-                # reporting, e.g. a file name and a position in the file.
-            "expression": "A String", # Textual representation of an expression in
-                # Common Expression Language syntax.
-                #
-                # The application context of the containing message determines which
-                # well-known feature set of CEL is supported.
-            "description": "A String", # An optional description of the expression. This is a longer text which
-                # describes the expression, e.g. when hovered over it in a UI.
-            "title": "A String", # An optional title for the expression, i.e. a short string describing
-                # its purpose. This can be used e.g. in UIs which allow to enter the
-                # expression.
-          },
-        },
-      ],
-      "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
-          # prevent simultaneous updates of a policy from overwriting each other.
-          # It is strongly suggested that systems make use of the `etag` in the
-          # read-modify-write cycle to perform policy updates in order to avoid race
-          # conditions: An `etag` is returned in the response to `getIamPolicy`, and
-          # systems are expected to put that etag in the request to `setIamPolicy` to
-          # ensure that their change will be applied to the same version of the policy.
-          #
-          # If no `etag` is provided in the call to `setIamPolicy`, then the existing
-          # policy is overwritten blindly.
-      "version": 42, # Deprecated.
-    },
-  }
-
-  x__xgafv: string, V1 error format.
-    Allowed values
-      1 - v1 error format
-      2 - v2 error format
-
-Returns:
-  An object of the form:
-
-    { # Defines an Identity and Access Management (IAM) policy. It is used to
-      # specify access control policies for Cloud Platform resources.
-      #
-      #
-      # A `Policy` consists of a list of `bindings`. A `binding` binds a list of
-      # `members` to a `role`, where the members can be user accounts, Google groups,
-      # Google domains, and service accounts. A `role` is a named list of permissions
-      # defined by IAM.
-      #
-      # **JSON Example**
-      #
-      #     {
-      #       "bindings": [
-      #         {
-      #           "role": "roles/owner",
-      #           "members": [
-      #             "user:mike@example.com",
-      #             "group:admins@example.com",
-      #             "domain:google.com",
-      #             "serviceAccount:my-other-app@appspot.gserviceaccount.com"
-      #           ]
-      #         },
-      #         {
-      #           "role": "roles/viewer",
-      #           "members": ["user:sean@example.com"]
-      #         }
-      #       ]
-      #     }
-      #
-      # **YAML Example**
-      #
-      #     bindings:
-      #     - members:
-      #       - user:mike@example.com
-      #       - group:admins@example.com
-      #       - domain:google.com
-      #       - serviceAccount:my-other-app@appspot.gserviceaccount.com
-      #       role: roles/owner
-      #     - members:
-      #       - user:sean@example.com
-      #       role: roles/viewer
-      #
-      #
-      # For a description of IAM and its features, see the
-      # [IAM developer's guide](https://cloud.google.com/iam/docs).
-    "bindings": [ # Associates a list of `members` to a `role`.
-        # `bindings` with no members will result in an error.
-      { # Associates `members` with a `role`.
-        "role": "A String", # Role that is assigned to `members`.
-            # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
-        "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
-            # `members` can have the following values:
-            #
-            # * `allUsers`: A special identifier that represents anyone who is
-            #    on the internet; with or without a Google account.
-            #
-            # * `allAuthenticatedUsers`: A special identifier that represents anyone
-            #    who is authenticated with a Google account or a service account.
-            #
-            # * `user:{emailid}`: An email address that represents a specific Google
-            #    account. For example, `alice@gmail.com` .
-            #
-            #
-            # * `serviceAccount:{emailid}`: An email address that represents a service
-            #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
-            #
-            # * `group:{emailid}`: An email address that represents a Google group.
-            #    For example, `admins@example.com`.
-            #
-            #
-            # * `domain:{domain}`: The G Suite domain (primary) that represents all the
-            #    users of that domain. For example, `google.com` or `example.com`.
-            #
-          "A String",
-        ],
-        "condition": { # Represents an expression text. Example: # The condition that is associated with this binding.
-            # NOTE: An unsatisfied condition will not allow user access via current
-            # binding. Different bindings, including their conditions, are examined
-            # independently.
-            #
-            #     title: "User account presence"
-            #     description: "Determines whether the request has a user account"
-            #     expression: "size(request.user) > 0"
-          "location": "A String", # An optional string indicating the location of the expression for error
-              # reporting, e.g. a file name and a position in the file.
-          "expression": "A String", # Textual representation of an expression in
-              # Common Expression Language syntax.
-              #
-              # The application context of the containing message determines which
-              # well-known feature set of CEL is supported.
-          "description": "A String", # An optional description of the expression. This is a longer text which
-              # describes the expression, e.g. when hovered over it in a UI.
-          "title": "A String", # An optional title for the expression, i.e. a short string describing
-              # its purpose. This can be used e.g. in UIs which allow to enter the
-              # expression.
-        },
-      },
-    ],
-    "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
-        # prevent simultaneous updates of a policy from overwriting each other.
-        # It is strongly suggested that systems make use of the `etag` in the
-        # read-modify-write cycle to perform policy updates in order to avoid race
-        # conditions: An `etag` is returned in the response to `getIamPolicy`, and
-        # systems are expected to put that etag in the request to `setIamPolicy` to
-        # ensure that their change will be applied to the same version of the policy.
-        #
-        # If no `etag` is provided in the call to `setIamPolicy`, then the existing
-        # policy is overwritten blindly.
-    "version": 42, # Deprecated.
-  }</pre>
-</div>
-
-<div class="method">
-    <code class="details" id="testIamPermissions">testIamPermissions(resource, body, x__xgafv=None)</code>
-  <pre>Returns permissions that the caller has on the specified database resource.
-
-Attempting this RPC on a non-existent Cloud Spanner database will
-result in a NOT_FOUND error if the user has
-`spanner.databases.list` permission on the containing Cloud
-Spanner instance. Otherwise returns an empty set of permissions.
-
-Args:
-  resource: string, REQUIRED: The Cloud Spanner resource for which permissions are being tested. The format is `projects/<project ID>/instances/<instance ID>` for instance resources and `projects/<project ID>/instances/<instance ID>/databases/<database ID>` for database resources. (required)
-  body: object, The request body. (required)
-    The object takes the form of:
-
-{ # Request message for `TestIamPermissions` method.
-    "permissions": [ # REQUIRED: The set of permissions to check for 'resource'.
-        # Permissions with wildcards (such as '*', 'spanner.*', 'spanner.instances.*') are not allowed.
-      "A String",
-    ],
-  }
-
-  x__xgafv: string, V1 error format.
-    Allowed values
-      1 - v1 error format
-      2 - v2 error format
-
-Returns:
-  An object of the form:
-
-    { # Response message for `TestIamPermissions` method.
-    "permissions": [ # A subset of `TestPermissionsRequest.permissions` that the caller is
-        # allowed.
-      "A String",
-    ],
-  }</pre>
-</div>
-
-<div class="method">
-    <code class="details" id="updateDdl">updateDdl(database, body, x__xgafv=None)</code>
-  <pre>Updates the schema of a Cloud Spanner database by
-creating/altering/dropping tables, columns, indexes, etc. The returned
-long-running operation will have a name of
-the format `<database_name>/operations/<operation_id>` and can be used to
-track execution of the schema change(s). The
-metadata field type is
-UpdateDatabaseDdlMetadata.  The operation has no response.
-
-Args:
-  database: string, Required. The database to update. (required)
-  body: object, The request body. (required)
-    The object takes the form of:
-
-{ # Enqueues the given DDL statements to be applied, in order but not
-      # necessarily all at once, to the database schema at some point (or
-      # points) in the future. The server checks that the statements
-      # are executable (syntactically valid, name tables that exist, etc.)
-      # before enqueueing them, but they may still fail upon
-      # later execution (e.g., if a statement from another batch of
-      # statements is applied first and it conflicts in some way, or if
-      # there is some data-related problem like a `NULL` value in a column to
-      # which `NOT NULL` would be added). If a statement fails, all
-      # subsequent statements in the batch are automatically cancelled.
-      # 
-      # Each batch of statements is assigned a name which can be used with
-      # the Operations API to monitor
-      # progress. See the
-      # operation_id field for more
-      # details.
-    "statements": [ # DDL statements to be applied to the database.
-      "A String",
-    ],
-    "operationId": "A String", # If empty, the new update request is assigned an
-        # automatically-generated operation ID. Otherwise, `operation_id`
-        # is used to construct the name of the resulting
-        # Operation.
-        # 
-        # Specifying an explicit operation ID simplifies determining
-        # whether the statements were executed in the event that the
-        # UpdateDatabaseDdl call is replayed,
-        # or the return value is otherwise lost: the database and
-        # `operation_id` fields can be combined to form the
-        # name of the resulting
-        # longrunning.Operation: `<database>/operations/<operation_id>`.
-        # 
-        # `operation_id` should be unique within the database, and must be
-        # a valid identifier: `a-z*`. Note that
-        # automatically-generated operation IDs always begin with an
-        # underscore. If the named operation already exists,
-        # UpdateDatabaseDdl returns
-        # `ALREADY_EXISTS`.
+{ # The request for
+      # RestoreDatabase.
+    "databaseId": "A String", # Required. The id of the database to create and restore to. This
+        # database must not already exist. The `database_id` appended to
+        # `parent` forms the full database name of the form
+        # `projects/&lt;project&gt;/instances/&lt;instance&gt;/databases/&lt;database_id&gt;`.
+    "backup": "A String", # Name of the backup from which to restore.  Values are of the form
+        # `projects/&lt;project&gt;/instances/&lt;instance&gt;/backups/&lt;backup&gt;`.
   }
 
   x__xgafv: string, V1 error format.
@@ -858,64 +637,13 @@
 
     { # This resource represents a long-running operation that is the result of a
       # network API call.
-    "metadata": { # Service-specific metadata associated with the operation.  It typically
-        # contains progress information and common metadata such as create time.
-        # Some services might not provide such metadata.  Any method that returns a
-        # long-running operation should document the metadata type, if any.
-      "a_key": "", # Properties of the object. Contains field @type with type URL.
-    },
     "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
         # different programming environments, including REST APIs and RPC APIs. It is
-        # used by [gRPC](https://github.com/grpc). The error model is designed to be:
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
         #
-        # - Simple to use and understand for most users
-        # - Flexible enough to meet unexpected needs
-        #
-        # # Overview
-        #
-        # The `Status` message contains three pieces of data: error code, error
-        # message, and error details. The error code should be an enum value of
-        # google.rpc.Code, but it may accept additional error codes if needed.  The
-        # error message should be a developer-facing English message that helps
-        # developers *understand* and *resolve* the error. If a localized user-facing
-        # error message is needed, put the localized message in the error details or
-        # localize it in the client. The optional error details may contain arbitrary
-        # information about the error. There is a predefined set of error detail types
-        # in the package `google.rpc` that can be used for common error conditions.
-        #
-        # # Language mapping
-        #
-        # The `Status` message is the logical representation of the error model, but it
-        # is not necessarily the actual wire format. When the `Status` message is
-        # exposed in different client libraries and different wire protocols, it can be
-        # mapped differently. For example, it will likely be mapped to some exceptions
-        # in Java, but more likely mapped to some error codes in C.
-        #
-        # # Other uses
-        #
-        # The error model and the `Status` message can be used in a variety of
-        # environments, either with or without APIs, to provide a
-        # consistent developer experience across different environments.
-        #
-        # Example uses of this error model include:
-        #
-        # - Partial errors. If a service needs to return partial errors to the client,
-        #     it may embed the `Status` in the normal response to indicate the partial
-        #     errors.
-        #
-        # - Workflow errors. A typical workflow has multiple steps. Each step may
-        #     have a `Status` message for error reporting.
-        #
-        # - Batch operations. If a client uses batch request and batch response, the
-        #     `Status` message should be used directly inside batch response, one for
-        #     each error sub-response.
-        #
-        # - Asynchronous operations. If an API call embeds asynchronous operation
-        #     results in its response, the status of those operations should be
-        #     represented directly using the `Status` message.
-        #
-        # - Logging. If some API errors are stored in logs, the message `Status` could
-        #     be used directly after any stripping needed for security/privacy reasons.
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
       "message": "A String", # A developer-facing error message, which should be in English. Any
           # user-facing error message should be localized and sent in the
           # google.rpc.Status.details field, or localized by the client.
@@ -943,6 +671,580 @@
     "name": "A String", # The server-assigned name, which is only unique within the same service that
         # originally returns it. If you use the default HTTP mapping, the
         # `name` should be a resource name ending with `operations/{unique_id}`.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="setIamPolicy">setIamPolicy(resource, body=None, x__xgafv=None)</code>
+  <pre>Sets the access control policy on a database or backup resource.
+Replaces any existing policy.
+
+Authorization requires `spanner.databases.setIamPolicy`
+permission on resource.
+For backups, authorization requires `spanner.backups.setIamPolicy`
+permission on resource.
+
+Args:
+  resource: string, REQUIRED: The Cloud Spanner resource for which the policy is being set. The format is `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;` for instance resources and `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;/databases/&lt;database ID&gt;` for databases resources. (required)
+  body: object, The request body.
+    The object takes the form of:
+
+{ # Request message for `SetIamPolicy` method.
+    "policy": { # An Identity and Access Management (IAM) policy, which specifies access # REQUIRED: The complete policy to be applied to the `resource`. The size of
+        # the policy is limited to a few 10s of KB. An empty policy is a
+        # valid policy but certain Cloud Platform services (such as Projects)
+        # might reject them.
+        # controls for Google Cloud resources.
+        #
+        #
+        # A `Policy` is a collection of `bindings`. A `binding` binds one or more
+        # `members` to a single `role`. Members can be user accounts, service accounts,
+        # Google groups, and domains (such as G Suite). A `role` is a named list of
+        # permissions; each `role` can be an IAM predefined role or a user-created
+        # custom role.
+        #
+        # Optionally, a `binding` can specify a `condition`, which is a logical
+        # expression that allows access to a resource only if the expression evaluates
+        # to `true`. A condition can add constraints based on attributes of the
+        # request, the resource, or both.
+        #
+        # **JSON example:**
+        #
+        #     {
+        #       "bindings": [
+        #         {
+        #           "role": "roles/resourcemanager.organizationAdmin",
+        #           "members": [
+        #             "user:mike@example.com",
+        #             "group:admins@example.com",
+        #             "domain:google.com",
+        #             "serviceAccount:my-project-id@appspot.gserviceaccount.com"
+        #           ]
+        #         },
+        #         {
+        #           "role": "roles/resourcemanager.organizationViewer",
+        #           "members": ["user:eve@example.com"],
+        #           "condition": {
+        #             "title": "expirable access",
+        #             "description": "Does not grant access after Sep 2020",
+        #             "expression": "request.time &lt; timestamp('2020-10-01T00:00:00.000Z')",
+        #           }
+        #         }
+        #       ],
+        #       "etag": "BwWWja0YfJA=",
+        #       "version": 3
+        #     }
+        #
+        # **YAML example:**
+        #
+        #     bindings:
+        #     - members:
+        #       - user:mike@example.com
+        #       - group:admins@example.com
+        #       - domain:google.com
+        #       - serviceAccount:my-project-id@appspot.gserviceaccount.com
+        #       role: roles/resourcemanager.organizationAdmin
+        #     - members:
+        #       - user:eve@example.com
+        #       role: roles/resourcemanager.organizationViewer
+        #       condition:
+        #         title: expirable access
+        #         description: Does not grant access after Sep 2020
+        #         expression: request.time &lt; timestamp('2020-10-01T00:00:00.000Z')
+        #     - etag: BwWWja0YfJA=
+        #     - version: 3
+        #
+        # For a description of IAM and its features, see the
+        # [IAM documentation](https://cloud.google.com/iam/docs/).
+      "bindings": [ # Associates a list of `members` to a `role`. Optionally, may specify a
+          # `condition` that determines how and when the `bindings` are applied. Each
+          # of the `bindings` must contain at least one member.
+        { # Associates `members` with a `role`.
+          "role": "A String", # Role that is assigned to `members`.
+              # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
+          "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
+              # `members` can have the following values:
+              #
+              # * `allUsers`: A special identifier that represents anyone who is
+              #    on the internet; with or without a Google account.
+              #
+              # * `allAuthenticatedUsers`: A special identifier that represents anyone
+              #    who is authenticated with a Google account or a service account.
+              #
+              # * `user:{emailid}`: An email address that represents a specific Google
+              #    account. For example, `alice@example.com` .
+              #
+              #
+              # * `serviceAccount:{emailid}`: An email address that represents a service
+              #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
+              #
+              # * `group:{emailid}`: An email address that represents a Google group.
+              #    For example, `admins@example.com`.
+              #
+              # * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique
+              #    identifier) representing a user that has been recently deleted. For
+              #    example, `alice@example.com?uid=123456789012345678901`. If the user is
+              #    recovered, this value reverts to `user:{emailid}` and the recovered user
+              #    retains the role in the binding.
+              #
+              # * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus
+              #    unique identifier) representing a service account that has been recently
+              #    deleted. For example,
+              #    `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`.
+              #    If the service account is undeleted, this value reverts to
+              #    `serviceAccount:{emailid}` and the undeleted service account retains the
+              #    role in the binding.
+              #
+              # * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique
+              #    identifier) representing a Google group that has been recently
+              #    deleted. For example, `admins@example.com?uid=123456789012345678901`. If
+              #    the group is recovered, this value reverts to `group:{emailid}` and the
+              #    recovered group retains the role in the binding.
+              #
+              #
+              # * `domain:{domain}`: The G Suite domain (primary) that represents all the
+              #    users of that domain. For example, `google.com` or `example.com`.
+              #
+            "A String",
+          ],
+          "condition": { # Represents a textual expression in the Common Expression Language (CEL) # The condition that is associated with this binding.
+              # NOTE: An unsatisfied condition will not allow user access via current
+              # binding. Different bindings, including their conditions, are examined
+              # independently.
+              # syntax. CEL is a C-like expression language. The syntax and semantics of CEL
+              # are documented at https://github.com/google/cel-spec.
+              #
+              # Example (Comparison):
+              #
+              #     title: "Summary size limit"
+              #     description: "Determines if a summary is less than 100 chars"
+              #     expression: "document.summary.size() &lt; 100"
+              #
+              # Example (Equality):
+              #
+              #     title: "Requestor is owner"
+              #     description: "Determines if requestor is the document owner"
+              #     expression: "document.owner == request.auth.claims.email"
+              #
+              # Example (Logic):
+              #
+              #     title: "Public documents"
+              #     description: "Determine whether the document should be publicly visible"
+              #     expression: "document.type != 'private' &amp;&amp; document.type != 'internal'"
+              #
+              # Example (Data Manipulation):
+              #
+              #     title: "Notification string"
+              #     description: "Create a notification string with a timestamp."
+              #     expression: "'New message received at ' + string(document.create_time)"
+              #
+              # The exact variables and functions that may be referenced within an expression
+              # are determined by the service that evaluates it. See the service
+              # documentation for additional information.
+            "location": "A String", # Optional. String indicating the location of the expression for error
+                # reporting, e.g. a file name and a position in the file.
+            "expression": "A String", # Textual representation of an expression in Common Expression Language
+                # syntax.
+            "description": "A String", # Optional. Description of the expression. This is a longer text which
+                # describes the expression, e.g. when hovered over it in a UI.
+            "title": "A String", # Optional. Title for the expression, i.e. a short string describing
+                # its purpose. This can be used e.g. in UIs which allow to enter the
+                # expression.
+          },
+        },
+      ],
+      "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
+          # prevent simultaneous updates of a policy from overwriting each other.
+          # It is strongly suggested that systems make use of the `etag` in the
+          # read-modify-write cycle to perform policy updates in order to avoid race
+          # conditions: An `etag` is returned in the response to `getIamPolicy`, and
+          # systems are expected to put that etag in the request to `setIamPolicy` to
+          # ensure that their change will be applied to the same version of the policy.
+          #
+          # **Important:** If you use IAM Conditions, you must include the `etag` field
+          # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+          # you to overwrite a version `3` policy with a version `1` policy, and all of
+          # the conditions in the version `3` policy are lost.
+      "version": 42, # Specifies the format of the policy.
+          #
+          # Valid values are `0`, `1`, and `3`. Requests that specify an invalid value
+          # are rejected.
+          #
+          # Any operation that affects conditional role bindings must specify version
+          # `3`. This requirement applies to the following operations:
+          #
+          # * Getting a policy that includes a conditional role binding
+          # * Adding a conditional role binding to a policy
+          # * Changing a conditional role binding in a policy
+          # * Removing any role binding, with or without a condition, from a policy
+          #   that includes conditions
+          #
+          # **Important:** If you use IAM Conditions, you must include the `etag` field
+          # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+          # you to overwrite a version `3` policy with a version `1` policy, and all of
+          # the conditions in the version `3` policy are lost.
+          #
+          # If a policy does not include any conditions, operations on that policy may
+          # specify any valid version or leave the field unset.
+    },
+  }
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # An Identity and Access Management (IAM) policy, which specifies access
+      # controls for Google Cloud resources.
+      #
+      #
+      # A `Policy` is a collection of `bindings`. A `binding` binds one or more
+      # `members` to a single `role`. Members can be user accounts, service accounts,
+      # Google groups, and domains (such as G Suite). A `role` is a named list of
+      # permissions; each `role` can be an IAM predefined role or a user-created
+      # custom role.
+      #
+      # Optionally, a `binding` can specify a `condition`, which is a logical
+      # expression that allows access to a resource only if the expression evaluates
+      # to `true`. A condition can add constraints based on attributes of the
+      # request, the resource, or both.
+      #
+      # **JSON example:**
+      #
+      #     {
+      #       "bindings": [
+      #         {
+      #           "role": "roles/resourcemanager.organizationAdmin",
+      #           "members": [
+      #             "user:mike@example.com",
+      #             "group:admins@example.com",
+      #             "domain:google.com",
+      #             "serviceAccount:my-project-id@appspot.gserviceaccount.com"
+      #           ]
+      #         },
+      #         {
+      #           "role": "roles/resourcemanager.organizationViewer",
+      #           "members": ["user:eve@example.com"],
+      #           "condition": {
+      #             "title": "expirable access",
+      #             "description": "Does not grant access after Sep 2020",
+      #             "expression": "request.time &lt; timestamp('2020-10-01T00:00:00.000Z')",
+      #           }
+      #         }
+      #       ],
+      #       "etag": "BwWWja0YfJA=",
+      #       "version": 3
+      #     }
+      #
+      # **YAML example:**
+      #
+      #     bindings:
+      #     - members:
+      #       - user:mike@example.com
+      #       - group:admins@example.com
+      #       - domain:google.com
+      #       - serviceAccount:my-project-id@appspot.gserviceaccount.com
+      #       role: roles/resourcemanager.organizationAdmin
+      #     - members:
+      #       - user:eve@example.com
+      #       role: roles/resourcemanager.organizationViewer
+      #       condition:
+      #         title: expirable access
+      #         description: Does not grant access after Sep 2020
+      #         expression: request.time &lt; timestamp('2020-10-01T00:00:00.000Z')
+      #     - etag: BwWWja0YfJA=
+      #     - version: 3
+      #
+      # For a description of IAM and its features, see the
+      # [IAM documentation](https://cloud.google.com/iam/docs/).
+    "bindings": [ # Associates a list of `members` to a `role`. Optionally, may specify a
+        # `condition` that determines how and when the `bindings` are applied. Each
+        # of the `bindings` must contain at least one member.
+      { # Associates `members` with a `role`.
+        "role": "A String", # Role that is assigned to `members`.
+            # For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
+        "members": [ # Specifies the identities requesting access for a Cloud Platform resource.
+            # `members` can have the following values:
+            #
+            # * `allUsers`: A special identifier that represents anyone who is
+            #    on the internet; with or without a Google account.
+            #
+            # * `allAuthenticatedUsers`: A special identifier that represents anyone
+            #    who is authenticated with a Google account or a service account.
+            #
+            # * `user:{emailid}`: An email address that represents a specific Google
+            #    account. For example, `alice@example.com` .
+            #
+            #
+            # * `serviceAccount:{emailid}`: An email address that represents a service
+            #    account. For example, `my-other-app@appspot.gserviceaccount.com`.
+            #
+            # * `group:{emailid}`: An email address that represents a Google group.
+            #    For example, `admins@example.com`.
+            #
+            # * `deleted:user:{emailid}?uid={uniqueid}`: An email address (plus unique
+            #    identifier) representing a user that has been recently deleted. For
+            #    example, `alice@example.com?uid=123456789012345678901`. If the user is
+            #    recovered, this value reverts to `user:{emailid}` and the recovered user
+            #    retains the role in the binding.
+            #
+            # * `deleted:serviceAccount:{emailid}?uid={uniqueid}`: An email address (plus
+            #    unique identifier) representing a service account that has been recently
+            #    deleted. For example,
+            #    `my-other-app@appspot.gserviceaccount.com?uid=123456789012345678901`.
+            #    If the service account is undeleted, this value reverts to
+            #    `serviceAccount:{emailid}` and the undeleted service account retains the
+            #    role in the binding.
+            #
+            # * `deleted:group:{emailid}?uid={uniqueid}`: An email address (plus unique
+            #    identifier) representing a Google group that has been recently
+            #    deleted. For example, `admins@example.com?uid=123456789012345678901`. If
+            #    the group is recovered, this value reverts to `group:{emailid}` and the
+            #    recovered group retains the role in the binding.
+            #
+            #
+            # * `domain:{domain}`: The G Suite domain (primary) that represents all the
+            #    users of that domain. For example, `google.com` or `example.com`.
+            #
+          "A String",
+        ],
+        "condition": { # Represents a textual expression in the Common Expression Language (CEL) # The condition that is associated with this binding.
+            # NOTE: An unsatisfied condition will not allow user access via current
+            # binding. Different bindings, including their conditions, are examined
+            # independently.
+            # syntax. CEL is a C-like expression language. The syntax and semantics of CEL
+            # are documented at https://github.com/google/cel-spec.
+            #
+            # Example (Comparison):
+            #
+            #     title: "Summary size limit"
+            #     description: "Determines if a summary is less than 100 chars"
+            #     expression: "document.summary.size() &lt; 100"
+            #
+            # Example (Equality):
+            #
+            #     title: "Requestor is owner"
+            #     description: "Determines if requestor is the document owner"
+            #     expression: "document.owner == request.auth.claims.email"
+            #
+            # Example (Logic):
+            #
+            #     title: "Public documents"
+            #     description: "Determine whether the document should be publicly visible"
+            #     expression: "document.type != 'private' &amp;&amp; document.type != 'internal'"
+            #
+            # Example (Data Manipulation):
+            #
+            #     title: "Notification string"
+            #     description: "Create a notification string with a timestamp."
+            #     expression: "'New message received at ' + string(document.create_time)"
+            #
+            # The exact variables and functions that may be referenced within an expression
+            # are determined by the service that evaluates it. See the service
+            # documentation for additional information.
+          "location": "A String", # Optional. String indicating the location of the expression for error
+              # reporting, e.g. a file name and a position in the file.
+          "expression": "A String", # Textual representation of an expression in Common Expression Language
+              # syntax.
+          "description": "A String", # Optional. Description of the expression. This is a longer text which
+              # describes the expression, e.g. when hovered over it in a UI.
+          "title": "A String", # Optional. Title for the expression, i.e. a short string describing
+              # its purpose. This can be used e.g. in UIs which allow to enter the
+              # expression.
+        },
+      },
+    ],
+    "etag": "A String", # `etag` is used for optimistic concurrency control as a way to help
+        # prevent simultaneous updates of a policy from overwriting each other.
+        # It is strongly suggested that systems make use of the `etag` in the
+        # read-modify-write cycle to perform policy updates in order to avoid race
+        # conditions: An `etag` is returned in the response to `getIamPolicy`, and
+        # systems are expected to put that etag in the request to `setIamPolicy` to
+        # ensure that their change will be applied to the same version of the policy.
+        #
+        # **Important:** If you use IAM Conditions, you must include the `etag` field
+        # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+        # you to overwrite a version `3` policy with a version `1` policy, and all of
+        # the conditions in the version `3` policy are lost.
+    "version": 42, # Specifies the format of the policy.
+        #
+        # Valid values are `0`, `1`, and `3`. Requests that specify an invalid value
+        # are rejected.
+        #
+        # Any operation that affects conditional role bindings must specify version
+        # `3`. This requirement applies to the following operations:
+        #
+        # * Getting a policy that includes a conditional role binding
+        # * Adding a conditional role binding to a policy
+        # * Changing a conditional role binding in a policy
+        # * Removing any role binding, with or without a condition, from a policy
+        #   that includes conditions
+        #
+        # **Important:** If you use IAM Conditions, you must include the `etag` field
+        # whenever you call `setIamPolicy`. If you omit this field, then IAM allows
+        # you to overwrite a version `3` policy with a version `1` policy, and all of
+        # the conditions in the version `3` policy are lost.
+        #
+        # If a policy does not include any conditions, operations on that policy may
+        # specify any valid version or leave the field unset.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="testIamPermissions">testIamPermissions(resource, body=None, x__xgafv=None)</code>
+  <pre>Returns permissions that the caller has on the specified database or backup
+resource.
+
+Attempting this RPC on a non-existent Cloud Spanner database will
+result in a NOT_FOUND error if the user has
+`spanner.databases.list` permission on the containing Cloud
+Spanner instance. Otherwise returns an empty set of permissions.
+Calling this method on a backup that does not exist will
+result in a NOT_FOUND error if the user has
+`spanner.backups.list` permission on the containing instance.
+
+Args:
+  resource: string, REQUIRED: The Cloud Spanner resource for which permissions are being tested. The format is `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;` for instance resources and `projects/&lt;project ID&gt;/instances/&lt;instance ID&gt;/databases/&lt;database ID&gt;` for database resources. (required)
+  body: object, The request body.
+    The object takes the form of:
+
+{ # Request message for `TestIamPermissions` method.
+    "permissions": [ # REQUIRED: The set of permissions to check for 'resource'.
+        # Permissions with wildcards (such as '*', 'spanner.*', 'spanner.instances.*') are not allowed.
+      "A String",
+    ],
+  }
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Response message for `TestIamPermissions` method.
+    "permissions": [ # A subset of `TestPermissionsRequest.permissions` that the caller is
+        # allowed.
+      "A String",
+    ],
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="updateDdl">updateDdl(database, body=None, x__xgafv=None)</code>
+  <pre>Updates the schema of a Cloud Spanner database by
+creating/altering/dropping tables, columns, indexes, etc. The returned
+long-running operation will have a name of
+the format `&lt;database_name&gt;/operations/&lt;operation_id&gt;` and can be used to
+track execution of the schema change(s). The
+metadata field type is
+UpdateDatabaseDdlMetadata.  The operation has no response.
+
+Args:
+  database: string, Required. The database to update. (required)
+  body: object, The request body.
+    The object takes the form of:
+
+{ # Enqueues the given DDL statements to be applied, in order but not
+      # necessarily all at once, to the database schema at some point (or
+      # points) in the future. The server checks that the statements
+      # are executable (syntactically valid, name tables that exist, etc.)
+      # before enqueueing them, but they may still fail upon
+      # later execution (e.g., if a statement from another batch of
+      # statements is applied first and it conflicts in some way, or if
+      # there is some data-related problem like a `NULL` value in a column to
+      # which `NOT NULL` would be added). If a statement fails, all
+      # subsequent statements in the batch are automatically cancelled.
+      # 
+      # Each batch of statements is assigned a name which can be used with
+      # the Operations API to monitor
+      # progress. See the
+      # operation_id field for more
+      # details.
+    "statements": [ # Required. DDL statements to be applied to the database.
+      "A String",
+    ],
+    "operationId": "A String", # If empty, the new update request is assigned an
+        # automatically-generated operation ID. Otherwise, `operation_id`
+        # is used to construct the name of the resulting
+        # Operation.
+        # 
+        # Specifying an explicit operation ID simplifies determining
+        # whether the statements were executed in the event that the
+        # UpdateDatabaseDdl call is replayed,
+        # or the return value is otherwise lost: the database and
+        # `operation_id` fields can be combined to form the
+        # name of the resulting
+        # longrunning.Operation: `&lt;database&gt;/operations/&lt;operation_id&gt;`.
+        # 
+        # `operation_id` should be unique within the database, and must be
+        # a valid identifier: `a-z*`. Note that
+        # automatically-generated operation IDs always begin with an
+        # underscore. If the named operation already exists,
+        # UpdateDatabaseDdl returns
+        # `ALREADY_EXISTS`.
+  }
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # This resource represents a long-running operation that is the result of a
+      # network API call.
+    "error": { # The `Status` type defines a logical error model that is suitable for # The error result of the operation in case of failure or cancellation.
+        # different programming environments, including REST APIs and RPC APIs. It is
+        # used by [gRPC](https://github.com/grpc). Each `Status` message contains
+        # three pieces of data: error code, error message, and error details.
+        #
+        # You can find out more about this error model and how to work with it in the
+        # [API Design Guide](https://cloud.google.com/apis/design/errors).
+      "message": "A String", # A developer-facing error message, which should be in English. Any
+          # user-facing error message should be localized and sent in the
+          # google.rpc.Status.details field, or localized by the client.
+      "code": 42, # The status code, which should be an enum value of google.rpc.Code.
+      "details": [ # A list of messages that carry the error details.  There is a common set of
+          # message types for APIs to use.
+        {
+          "a_key": "", # Properties of the object. Contains field @type with type URL.
+        },
+      ],
+    },
+    "done": True or False, # If the value is `false`, it means the operation is still in progress.
+        # If `true`, the operation is completed, and either `error` or `response` is
+        # available.
+    "response": { # The normal response of the operation in case of success.  If the original
+        # method returns no data on success, such as `Delete`, the response is
+        # `google.protobuf.Empty`.  If the original method is standard
+        # `Get`/`Create`/`Update`, the response should be the resource.  For other
+        # methods, the response should have the type `XxxResponse`, where `Xxx`
+        # is the original method name.  For example, if the original method name
+        # is `TakeSnapshot()`, the inferred response type is
+        # `TakeSnapshotResponse`.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
+    "name": "A String", # The server-assigned name, which is only unique within the same service that
+        # originally returns it. If you use the default HTTP mapping, the
+        # `name` should be a resource name ending with `operations/{unique_id}`.
+    "metadata": { # Service-specific metadata associated with the operation.  It typically
+        # contains progress information and common metadata such as create time.
+        # Some services might not provide such metadata.  Any method that returns a
+        # long-running operation should document the metadata type, if any.
+      "a_key": "", # Properties of the object. Contains field @type with type URL.
+    },
   }</pre>
 </div>