feat(spanner): add field for multiplexed session in spanner.proto

docs: update comments

PiperOrigin-RevId: 607015598

google/spanner/v1/spanner.proto

@@ -402,6 +402,15 @@ message Session {
 
   // The database role which created this session.
   string creator_role = 5;
+
+  // Optional. If true, specifies a multiplexed session. A multiplexed session
+  // may be used for multiple, concurrent read-only operations but can not be
+  // used for read-write transactions, partitioned reads, or partitioned
+  // queries. Multiplexed sessions can be created via
+  // [CreateSession][google.spanner.v1.Spanner.CreateSession] but not via
+  // [BatchCreateSessions][google.spanner.v1.Spanner.BatchCreateSessions].
+  // Multiplexed sessions may not be deleted nor listed.
+  bool multiplexed = 6 [(google.api.field_behavior) = OPTIONAL];
 }
 
 // The request for [GetSession][google.spanner.v1.Spanner.GetSession].
@@ -546,7 +555,7 @@ message DirectedReadOptions {
   //   * `location:us-east1` --> The "us-east1" replica(s) of any available type
   //                             will be used to process the request.
   //   * `type:READ_ONLY`    --> The "READ_ONLY" type replica(s) in nearest
-  // .                            available location will be used to process the
+  //                             available location will be used to process the
   //                             request.
   //   * `location:us-east1 type:READ_ONLY` --> The "READ_ONLY" type replica(s)
   //                          in location "us-east1" will be used to process
@@ -590,8 +599,7 @@ message DirectedReadOptions {
     repeated ReplicaSelection replica_selections = 1;
   }
 
-  // Required. Replicas indicates the order in which replicas should be
-  // considered. At most one of either include_replicas or exclude_replicas
+  // Required. At most one of either include_replicas or exclude_replicas
   // should be present in the message.
   oneof replicas {
     // Include_replicas indicates the order of replicas (as they appear in
@@ -601,8 +609,9 @@ message DirectedReadOptions {
     // may fail due to `DEADLINE_EXCEEDED` errors.
     IncludeReplicas include_replicas = 1;
 
-    // Exclude_replicas indicates that should be excluded from serving
-    // requests. Spanner will not route requests to the replicas in this list.
+    // Exclude_replicas indicates that specified replicas should be excluded
+    // from serving requests. Spanner will not route requests to the replicas
+    // in this list.
     ExcludeReplicas exclude_replicas = 2;
   }
 }
@@ -1211,6 +1220,21 @@ message BatchWriteRequest {
   // Required. The groups of mutations to be applied.
   repeated MutationGroup mutation_groups = 4
       [(google.api.field_behavior) = REQUIRED];
+
+  // Optional. When `exclude_txn_from_change_streams` is set to `true`:
+  //  * Mutations from all transactions in this batch write operation will not
+  //  be recorded in change streams with DDL option `allow_txn_exclusion=true`
+  //  that are tracking columns modified by these transactions.
+  //  * Mutations from all transactions in this batch write operation will be
+  //  recorded in change streams with DDL option `allow_txn_exclusion=false or
+  //  not set` that are tracking columns modified by these transactions.
+  //
+  // When `exclude_txn_from_change_streams` is set to `false` or not set,
+  // mutations from all transactions in this batch write operation will be
+  // recorded in all change streams that are tracking columns modified by these
+  // transactions.
+  bool exclude_txn_from_change_streams = 5
+      [(google.api.field_behavior) = OPTIONAL];
 }
 
 // The result of applying a batch of mutations.