Do not cleanup temp tables in autovacuum in case of session pooling

Author: knizhnik

src/backend/catalog/namespace.c

@@ -3227,7 +3227,7 @@ isTempNamespaceInUse(Oid namespaceId)
 		return false;
 
 	/* Does the backend own the temporary namespace? */
-	if (proc->tempNamespaceId != namespaceId)
+	if (SessionPoolSize == 0 && proc->tempNamespaceId != namespaceId)
 		return false;
 
 	/* all good to go */

src/backend/postmaster/postmaster.c

@@ -4376,7 +4376,7 @@ ScheduleSession(DatabasePool *pool, Port *port)
 				{
 					worker = pool->workers[j];
 					if (!worker->proc)
-						worker->proc = BackendPidGetProc(worker->pid);
+						worker->proc = BackendPidGetProcWithLock(worker->pid);
 					ws[j].worker = worker;
 					ws[j].load_average = (worker->proc && worker->proc->nSessionSchedules > 0)
 						? (double)worker->proc->nReadySessions / worker->proc->nSessionSchedules