diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 3ad5465d67..47289221c0 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -1791,7 +1791,7 @@ typedef struct STableMergeScanInfo {
   uint64_t      groupId;
   STupleHandle* prefetchedTuple;
 
-  SArray*       sortSourceParams;
+  SArray* sortSourceParams;
 
   SFileBlockLoadRecorder readRecorder;
   int64_t                numOfRows;
@@ -1842,12 +1842,17 @@ int32_t createMultipleDataReaders(STableScanPhysiNode* pTableScanNode, SReadHand
   if (code != TSDB_CODE_SUCCESS) {
     goto _error;
   }
+  // TODO: free the sublist info and the table list in it
   for (int32_t i = 0; i < taosArrayGetSize(pTableListInfo->pTableList); ++i) {
     STableListInfo* subListInfo = taosMemoryCalloc(1, sizeof(subListInfo));
     subListInfo->pTableList = taosArrayInit(1, sizeof(STableKeyInfo));
     taosArrayPush(subListInfo->pTableList, taosArrayGet(pTableListInfo->pTableList, i));
-    tsdbReaderT* pReader = tsdbReaderOpen(pHandle->vnode, &cond, pTableListInfo, queryId, taskId);
+
+    tsdbReaderT* pReader = tsdbReaderOpen(pHandle->vnode, &cond, subListInfo, queryId, taskId);
     taosArrayPush(arrayReader, &pReader);
+
+    taosArrayDestroy(subListInfo->pTableList);
+    taosMemoryFree(subListInfo);
   }
   clearupQueryTableDataCond(&cond);
 
@@ -2042,8 +2047,6 @@ int32_t doOpenTableMergeScanOperator(SOperatorInfo* pOperator) {
     return TSDB_CODE_SUCCESS;
   }
 
-  pInfo->startTs = taosGetTimestampUs();
-
   int32_t numOfBufPage = pInfo->sortBufSize / pInfo->bufPageSize;
 
   pInfo->pSortHandle =
@@ -2074,7 +2077,8 @@ int32_t doOpenTableMergeScanOperator(SOperatorInfo* pOperator) {
   return TSDB_CODE_SUCCESS;
 }
 
-SSDataBlock* getSortedTableMergeScanBlockData(SSortHandle* pHandle, SSDataBlock* pDataBlock, int32_t capacity, SOperatorInfo* pOperator) {
+SSDataBlock* getSortedTableMergeScanBlockData(SSortHandle* pHandle, SSDataBlock* pDataBlock, int32_t capacity,
+                                              SOperatorInfo* pOperator) {
   STableMergeScanInfo* pInfo = pOperator->info;
   SExecTaskInfo*       pTaskInfo = pOperator->pTaskInfo;
 
@@ -2137,8 +2141,8 @@ SSDataBlock* doTableMergeScan(SOperatorInfo* pOperator) {
     longjmp(pTaskInfo->env, code);
   }
 
-  SSDataBlock* pBlock = getSortedTableMergeScanBlockData(
-      pInfo->pSortHandle, pInfo->pResBlock, pOperator->resultInfo.capacity,  pOperator);
+  SSDataBlock* pBlock =
+      getSortedTableMergeScanBlockData(pInfo->pSortHandle, pInfo->pResBlock, pOperator->resultInfo.capacity, pOperator);
 
   if (pBlock != NULL) {
     pOperator->resultInfo.totalRows += pBlock->info.rows;
@@ -2154,7 +2158,7 @@ void destroyTableMergeScanOperatorInfo(void* param, int32_t numOfOutput) {
   clearupQueryTableDataCond(&pTableScanInfo->cond);
 
   for (int32_t i = 0; i < taosArrayGetSize(pTableScanInfo->dataReaders); ++i) {
-    tsdbReaderT*     reader = taosArrayGetP(pTableScanInfo->dataReaders, i);
+    tsdbReaderT* reader = taosArrayGetP(pTableScanInfo->dataReaders, i);
     tsdbCleanupReadHandle(reader);
   }
   taosArrayDestroy(pTableScanInfo->dataReaders);
@@ -2170,22 +2174,22 @@ void destroyTableMergeScanOperatorInfo(void* param, int32_t numOfOutput) {
   taosArrayDestroy(pTableScanInfo->pSortInfo);
 }
 
+typedef struct STableMergeScanExecInfo {
+  SFileBlockLoadRecorder blockRecorder;
+  SSortExecInfo sortExecInfo;
+} STableMergeScanExecInfo;
+
 int32_t getTableMergeScanExplainExecInfo(SOperatorInfo* pOptr, void** pOptrExplain, uint32_t* len) {
   ASSERT(pOptr != NULL);
-  //TODO: merge these two info into one struct
-  SFileBlockLoadRecorder* pRecorder = taosMemoryCalloc(1, sizeof(SFileBlockLoadRecorder));
-  STableScanInfo*         pTableScanInfo = pOptr->info;
-  *pRecorder = pTableScanInfo->readRecorder;
-  *pOptrExplain = pRecorder;
-  *len = sizeof(SFileBlockLoadRecorder);
+  // TODO: merge these two info into one struct
+  STableMergeScanExecInfo* execInfo = taosMemoryCalloc(1, sizeof(STableMergeScanExecInfo));
+  STableMergeScanInfo*         pInfo = pOptr->info;
+  execInfo->blockRecorder = pInfo->readRecorder;
+  execInfo->sortExecInfo = tsortGetSortExecInfo(pInfo->pSortHandle);
 
-  SSortExecInfo* pInfo = taosMemoryCalloc(1, sizeof(SSortExecInfo));
-
-  STableMergeScanInfo* pOperatorInfo = (STableMergeScanInfo*)pOptr->info;
-
-  *pInfo = tsortGetSortExecInfo(pOperatorInfo->pSortHandle);
-  *pOptrExplain = pInfo;
-  *len = sizeof(SSortExecInfo);
+  *pOptrExplain = execInfo;
+  *len = sizeof(STableMergeScanExecInfo);
+  
   return TSDB_CODE_SUCCESS;
 }