fix(stream): not dispatch checkpoint block result to downstream.

source/dnode/vnode/src/tq/tq.c

@@ -1673,7 +1673,8 @@ int32_t tqProcessStreamTaskCheckpointReadyMsg(STQ* pTq, SRpcMsg* pMsg) {
     return code;
   }
 
-  tqDebug("vgId:%d s-task:%s received the checkpoint ready msg, handle it", vgId, pTask->id.idStr);
+  tqDebug("vgId:%d s-task:%s received the checkpoint ready msg from task:0x%x (vgId:%d), handle it", vgId,
+          pTask->id.idStr, req.downstreamTaskId, req.downstreamNodeId);
 
   streamProcessCheckpointReadyMsg(pTask);
   streamMetaReleaseTask(pMeta, pTask);

source/libs/stream/src/streamExec.c

@@ -113,6 +113,8 @@ static int32_t streamTaskExecImpl(SStreamTask* pTask, SStreamQueueItem* pItem, i
         // TODO
       }
       continue;
+    } else if (output->info.type == STREAM_CHECKPOINT) {
+      continue; // checkpoint block not dispatch to downstream tasks
     }
 
     SSDataBlock block = {0};