lint(spanner): Apply suggestions from code review

Co-authored-by: Knut Olav Løite <[email protected]>

Author: pratickchokhani

google-cloud-spanner/src/main/java/com/google/cloud/spanner/DatabaseClientImpl.java

@@ -320,7 +320,7 @@ public long executePartitionedUpdate(final Statement stmt, final UpdateOption...
     return executePartitionedUpdateSession(stmt, options);
   }
 
-  private long executePartitionedUpdateSession(
+  private long executePartitionedUpdateWithPooledSession(
       final Statement stmt, final UpdateOption... options) {
     ISpan span = tracer.spanBuilder(PARTITION_DML_TRANSACTION);
     try (IScope s = tracer.withSpan(span)) {

google-cloud-spanner/src/main/java/com/google/cloud/spanner/DelayedMultiplexedSessionTransaction.java

@@ -233,9 +233,9 @@ private SessionReference getSessionReference() {
   @Override
   public long executePartitionedUpdate(Statement stmt, UpdateOption... options) {
     try {
-      SessionReference sessionReference = this.sessionFuture.get();
+      SessionReference sessionReference = getSessionReference();
       return new MultiplexedSessionTransaction(
-              client, span, sessionReference, NO_CHANNEL_HINT, true)
+              client, span, sessionReference, NO_CHANNEL_HINT, /* singleUse = */ true)
           .executePartitionedUpdate(stmt, options);
     } catch (InterruptedException e) {
       throw new RuntimeException(e);

google-cloud-spanner/src/main/java/com/google/cloud/spanner/MultiplexedSessionDatabaseClient.java

@@ -556,7 +556,7 @@ public AsyncTransactionManager transactionManagerAsync(TransactionOption... opti
 
   @Override
   public long executePartitionedUpdate(Statement stmt, UpdateOption... options) {
-    return createMultiplexedSessionTransaction(true).executePartitionedUpdate(stmt, options);
+    return createMultiplexedSessionTransaction(/* singleUse = */ true).executePartitionedUpdate(stmt, options);
   }
 
   /**

google-cloud-spanner/src/main/java/com/google/cloud/spanner/SessionClient.java

@@ -246,8 +246,8 @@ void createMultiplexedSession(SessionConsumer consumer) {
   }
 
   /**
-   * Create a multiplexed session and returns it. A multiplexed session is not affiliated with any
-   * GRPC channel. In case of an error on the gRPC calls, the error will be returned.
+   * Creates a multiplexed session and returns it. A multiplexed session is not affiliated with any
+   * GRPC channel. In case of an error during the gRPC calls, an exception will be thrown.
    */
   SessionImpl createMultiplexedSession() {
     ISpan span = spanner.getTracer().spanBuilder(SpannerImpl.CREATE_MULTIPLEXED_SESSION);