From 57039aa6067aab5b666188fc1d80cdbc57224be0 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Thu, 3 Dec 2020 10:40:38 +0800
Subject: [PATCH] [TD-2298]

---
 src/query/src/qExecutor.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index d0874c36bc..391a93c36a 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -3631,6 +3631,9 @@ void scanOneTableDataBlocks(SQueryRuntimeEnv *pRuntimeEnv, TSKEY start) {
       // do nothing if no data blocks are found qualified during scan
       if (qstatus.lastKey != pTableQueryInfo->lastKey) {
         qstatus.curWindow.ekey = pTableQueryInfo->lastKey - step;
+      } else { // the lastkey does not increase, which means no data checked yet, and all result rows has been closed.
+        qDebug("QInfo:%p no results generated in this scan, abort", pQInfo);
+        return;
       }
 
       qstatus.lastKey = pTableQueryInfo->lastKey;
-- 
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