Merge fix

Author: XmasApple

src/Ydb.Sdk/src/Services/Query/SessionPool.cs

@@ -153,11 +153,11 @@ private protected override Session CopySession(Session other)
             endpoint: other.Endpoint);
     }
 
-    private protected override void DeleteSession(string id)
+    private protected override async Task DeleteSession(string id)
     {
         DetachSession(id);
 
-        _ = Client.DeleteSession(id, new DeleteSessionSettings
+        await Client.DeleteSession(id, new DeleteSessionSettings
         {
             TransportTimeout = SessionBase.DeleteSessionTimeout
         });

src/Ydb.Sdk/src/Services/Sessions/SessionPoolBase.cs

@@ -155,7 +155,7 @@ internal void ReturnSession(string id)
 
     private protected abstract Task<GetSessionResponse<TSession>> CreateSession();
     private protected abstract TSession CopySession(TSession other);
-    private protected abstract void DeleteSession(string id);
+    private protected abstract Task DeleteSession(string id);
 
     internal void InvalidateSession(string id)
     {
@@ -182,12 +182,16 @@ private void Dispose(bool disposing)
 
             if (disposing)
             {
+                var tasks = new Task[Sessions.Count];
+                var i = 0;
                 foreach (var state in Sessions.Values)
                 {
                     Logger.LogTrace($"Closing session on session pool dispose: {state.Session.Id}");
 
-                    DeleteSession(state.Session.Id);
+                    var task = DeleteSession(state.Session.Id);
+                    tasks[i++] = task;
                 }
+                Task.WaitAll(tasks);
             }
 
             Disposed = true;

src/Ydb.Sdk/src/Services/Table/Session.cs

@@ -53,7 +53,7 @@ protected override void Dispose(bool disposing)
             {
                 Logger.LogTrace($"Closing detached session on dispose: {Id}");
 
-                var client = new TableClient(Driver, new NoPool());
+                var client = new TableClient(Driver, new NoPool<Session>());
                 var task = client.DeleteSession(Id, new DeleteSessionSettings
                 {
                     TransportTimeout = DeleteSessionTimeout

src/Ydb.Sdk/src/Services/Table/SessionPool.cs

@@ -140,9 +140,9 @@ private async Task CheckSessions()
         }
     }
 
-    private protected override void DeleteSession(string id)
+    private protected override async Task DeleteSession(string id)
     {
-        _ = Client.DeleteSession(id, new DeleteSessionSettings
+        await Client.DeleteSession(id, new DeleteSessionSettings
         {
             TransportTimeout = SessionBase.DeleteSessionTimeout
         });