fix(stream): fix the error when no agg tasks exist.

source/libs/stream/src/streamExec.c

@@ -509,24 +509,34 @@ int32_t streamProcessTranstateBlock(SStreamTask* pTask, SStreamDataBlock* pBlock
     }
   }
 
-  // transfer the ownership of executor state
-  if (level == TASK_LEVEL__SOURCE) {
-    qDebug("s-task:%s add transfer-state block into outputQ", id);
-  } else {
-    qDebug("s-task:%s all upstream tasks send transfer-state block, add transfer-state block into outputQ", id);
-    ASSERT(pTask->streamTaskId.taskId != 0 && pTask->info.fillHistory == 1);
-  }
-
   // dispatch the tran-state block to downstream task immediately
   int32_t type = pTask->outputInfo.type;
-  if ((level == TASK_LEVEL__AGG || level == TASK_LEVEL__SOURCE) &&
-      (type == TASK_OUTPUT__FIXED_DISPATCH || type == TASK_OUTPUT__SHUFFLE_DISPATCH)) {
-    pBlock->srcVgId = pTask->pMeta->vgId;
-    code = taosWriteQitem(pTask->outputInfo.queue->queue, pBlock);
-    if (code == 0) {
-      streamDispatchStreamBlock(pTask);
+
+  // transfer the ownership of executor state
+  if (type == TASK_OUTPUT__FIXED_DISPATCH || type == TASK_OUTPUT__SHUFFLE_DISPATCH) {
+    if (level == TASK_LEVEL__SOURCE) {
+      qDebug("s-task:%s add transfer-state block into outputQ", id);
     } else {
-      streamFreeQitem((SStreamQueueItem*)pBlock);
+      qDebug("s-task:%s all upstream tasks send transfer-state block, add transfer-state block into outputQ", id);
+      ASSERT(pTask->streamTaskId.taskId != 0 && pTask->info.fillHistory == 1);
+    }
+
+    if (level == TASK_LEVEL__AGG || level == TASK_LEVEL__SOURCE) {
+      pBlock->srcVgId = pTask->pMeta->vgId;
+      code = taosWriteQitem(pTask->outputInfo.queue->queue, pBlock);
+      if (code == 0) {
+        streamDispatchStreamBlock(pTask);
+      } else {
+        streamFreeQitem((SStreamQueueItem*)pBlock);
+      }
+    }
+  } else { // non-dispatch task, do task state transfer directly
+    qDebug("s-task:%s non-dispatch task, start to transfer state directly", id);
+    ASSERT(pTask->info.fillHistory == 1);
+    code = streamTransferStateToStreamTask(pTask);
+
+    if (code != TSDB_CODE_SUCCESS) {
+      atomic_store_8(&pTask->status.schedStatus, TASK_SCHED_STATUS__INACTIVE);
     }
   }