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Offering: openGaussDev

More detail:
	    修复线程池模式waitmission起事务后内存上下文不正确导致内存泄漏问题

Match-id-18f61b45531eaa886b7b7cf2bce9bf6c97a901fb

src/gausskernel/process/threadpool/threadpool_worker.cpp

@@ -185,6 +185,8 @@ void ThreadPoolWorker::WaitMission()
      * before we serve next session we must keep us clean.
      */
     PreventSignal();
+
+    MemoryContext old = CurrentMemoryContext;
     while (true) {
         /* we should keep the thread clean for next Session. */
         CleanThread();
@@ -222,7 +224,7 @@ void ThreadPoolWorker::WaitMission()
             break;
         }
     }
-
+    MemoryContextSwitchTo(old);
     (void)disable_session_sig_alarm();
     /* now we can accept signal. out of this, we rely on signal handle. */
     AllowSignal();