From 2e9e8434b4f6031cc25b6114b9ca86fd6ff188a3 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Mon, 2 Aug 2021 15:44:28 +0800
Subject: [PATCH] [td-5707]<fix>: fix bug in interp query while only one row
 exists in a table.

---
 src/tsdb/src/tsdbRead.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 0892182f03..be686fcffd 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -2373,7 +2373,7 @@ static void destroyHelper(void* param) {
   free(param);
 }
 
-static bool loadBlockOfActiveTable(STsdbQueryHandle* pQueryHandle) {
+static bool  loadBlockOfActiveTable(STsdbQueryHandle* pQueryHandle) {
   if (pQueryHandle->checkFiles) {
     // check if the query range overlaps with the file data block
     bool exists = true;
@@ -2385,6 +2385,7 @@ static bool loadBlockOfActiveTable(STsdbQueryHandle* pQueryHandle) {
     }
 
     if (exists) {
+      tsdbRetrieveDataBlock((TsdbQueryHandleT) pQueryHandle, NULL);
       if (pQueryHandle->currentLoadExternalRows && pQueryHandle->window.skey == pQueryHandle->window.ekey) {
         SColumnInfoData* pColInfo = taosArrayGet(pQueryHandle->pColumns, 0);
         assert(*(int64_t*)pColInfo->pData == pQueryHandle->window.skey);