yiguolei commented on code in PR #40495:
URL: https://github.com/apache/doris/pull/40495#discussion_r1749466401


##########
be/src/vec/exec/scan/scanner_context.cpp:
##########
@@ -263,13 +272,19 @@ Status ScannerContext::get_block_from_queue(RuntimeState* 
state, vectorized::Blo
             block->swap(*current_block);
             return_free_block(std::move(current_block));
         } else {
+            // This scan task do not have any cached blocks.
             _blocks_queue.pop_front();
-            if (scan_task->is_eos()) { // current scanner is finished, and no 
more data to read
+            // current scanner is finished, and no more data to read
+            if (scan_task->is_eos()) {
                 _num_finished_scanners++;
                 std::weak_ptr<ScannerDelegate> next_scanner;
                 // submit one of the remaining scanners
                 if (_scanners.try_dequeue(next_scanner)) {
-                    submit_scan_task(std::make_shared<ScanTask>(next_scanner));
+                    auto scan_task_ptr = 
std::make_shared<ScanTask>(next_scanner);
+                    Status submit_status = submit_scan_task(scan_task_ptr);
+                    if (!submit_status.ok()) {
+                        append_block_to_queue_locked(scan_task_ptr, l);

Review Comment:
   also should update the scanner context's status



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