fix(query): set correct varchar length.

source/common/src/tdatablock.c

@@ -1897,8 +1897,9 @@ const char* blockCompressDecode(SSDataBlock* pBlock, int32_t numOfCols, int32_t
 
         pColInfoData->pData = tmp;
         pColInfoData->varmeta.allocLen = colLen[i];
-        pColInfoData->varmeta.length = colLen[i];
       }
+
+      pColInfoData->varmeta.length = colLen[i];
     } else {
       memcpy(pColInfoData->nullbitmap, pStart, BitmapLen(numOfRows));
       pStart += BitmapLen(numOfRows);

source/libs/executor/src/executorimpl.c

@@ -2048,7 +2048,7 @@ int32_t extractDataBlockFromFetchRsp(SSDataBlock* pRes, SLoadRemoteDataInfo* pLo
                                      SArray* pColList) {
   if (pColList == NULL) {  // data from other sources
     blockDataCleanup(pRes);
-    blockDataEnsureCapacity(pRes, numOfRows);
+//    blockDataEnsureCapacity(pRes, numOfRows);
     blockCompressDecode(pRes, numOfOutput, numOfRows, pData);
   } else {  // extract data according to pColList
     ASSERT(numOfOutput == taosArrayGetSize(pColList));