diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 5a860c3b9513b3456188f0f1ca897830e4e84464..c343b9f589a988be1a26502ccb280d444de36af5 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -4461,7 +4461,7 @@ static int32_t loadDataBlockFromOneTable(SOperatorInfo* pOperator, STableMergeSc
   pCost->totalCheckedRows += pBlock->info.rows;
   pCost->loadBlocks += 1;
 
-  STsdbReader* reader = taosArrayGetP(pTableScanInfo->dataReaders, readerIdx);
+  STsdbReader* reader = pTableScanInfo->pReader;
   SArray*      pCols = tsdbRetrieveDataBlock(reader, NULL);
   if (pCols == NULL) {
     return terrno;