diff --git a/source/common/src/tdataformat.c b/source/common/src/tdataformat.c
index d6ab974c6ced8305ddad0ebc86f072a08bf9c978..66f539332aeca0df8ae690a30da93d6f63b98647 100644
--- a/source/common/src/tdataformat.c
+++ b/source/common/src/tdataformat.c
@@ -755,7 +755,7 @@ SColVal *tRowIterNext(SRowIter *pIter) {
   }
 
   if (pIter->pRow->flag == HAS_NULL) {
-    pIter->cv = COL_VAL_NULL(pTColumn->type, pTColumn->colId);
+    pIter->cv = COL_VAL_NULL(pTColumn->colId, pTColumn->type);
     goto _exit;
   }
 
@@ -2439,7 +2439,7 @@ _exit:
 int32_t tColDataAddValueByDataBlock(SColData *pColData, int8_t type, int32_t bytes, int32_t nRows, char *lengthOrbitmap,
                                     char *data) {
   int32_t code = 0;
-  if(data == NULL){
+  if (data == NULL) {
     for (int32_t i = 0; i < nRows; ++i) {
       code = tColDataAppendValueImpl[pColData->flag][CV_FLAG_NONE](pColData, NULL, 0);
     }
@@ -2453,8 +2453,9 @@ int32_t tColDataAddValueByDataBlock(SColData *pColData, int8_t type, int32_t byt
         code = tColDataAppendValueImpl[pColData->flag][CV_FLAG_NULL](pColData, NULL, 0);
         if (code) goto _exit;
       } else {
-        if(ASSERT(varDataTLen(data + offset) <= bytes)){
-          uError("var data length invalid, varDataTLen(data + offset):%d <= bytes:%d", (int)varDataTLen(data + offset), bytes);
+        if (ASSERT(varDataTLen(data + offset) <= bytes)) {
+          uError("var data length invalid, varDataTLen(data + offset):%d <= bytes:%d", (int)varDataTLen(data + offset),
+                 bytes);
           code = TSDB_CODE_INVALID_PARA;
           goto _exit;
         }
diff --git a/source/dnode/vnode/inc/vnode.h b/source/dnode/vnode/inc/vnode.h
index cadf6d1db7d4181729b195bf38ffca01d98fb95a..ebb18ecc765772a4f4a8ae6098d00f5294454bdb 100644
--- a/source/dnode/vnode/inc/vnode.h
+++ b/source/dnode/vnode/inc/vnode.h
@@ -195,7 +195,7 @@ void        *tsdbGetIvtIdx(SMeta *pMeta);
 uint64_t     getReaderMaxVersion(STsdbReader *pReader);
 
 int32_t tsdbCacherowsReaderOpen(void *pVnode, int32_t type, void *pTableIdList, int32_t numOfTables, int32_t numOfCols,
-                                SArray *pCidList, uint64_t suid, void **pReader, const char *idstr);
+                                SArray *pCidList, int32_t *pSlotIds, uint64_t suid, void **pReader, const char *idstr);
 int32_t tsdbRetrieveCacheRows(void *pReader, SSDataBlock *pResBlock, const int32_t *slotIds, const int32_t *dstSlotIds,
                               SArray *pTableUids);
 void   *tsdbCacherowsReaderClose(void *pReader);
diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index ee816bb1226c76ae3e4d4ebc85fc82c52d6e4152..08d4cbad1ac82cc324ae9e10a836ff344522fa03 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -788,6 +788,7 @@ typedef struct SCacheRowsReader {
   char             **transferBuf;  // todo remove it soon
   int32_t            numOfCols;
   SArray            *pCidList;
+  int32_t           *pSlotIds;
   int32_t            type;
   int32_t            tableIndex;  // currently returned result tables
   STableKeyInfo     *pTableList;  // table id list
diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index 04564f72c2d06ffab7ac5cb3a58185e961ff24d8..63dbb9a4d34353adc03d3d4ff0c61bbe9a12b876 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -259,10 +259,7 @@ int32_t tsdbCacheUpdate(STsdb *pTsdb, tb_uid_t suid, tb_uid_t uid, TSDBROW *pRow
     }
 
     if (!COL_VAL_IS_NONE(pColVal)) {
-      SLastCol *pLastCol = NULL;
-      if (NULL != values_list[i + num_keys]) {
-        pLastCol = tsdbCacheDeserialize(values_list[i + num_keys]);
-      }
+      SLastCol *pLastCol = tsdbCacheDeserialize(values_list[i + num_keys]);
 
       if (NULL == pLastCol || pLastCol->ts <= keyTs) {
         char  *value = NULL;
@@ -330,7 +327,24 @@ int32_t tsdbCacheGet(STsdb *pTsdb, tb_uid_t uid, SArray *pLastArray, SCacheRowsR
 
   for (int i = 0; i < num_keys; ++i) {
     SLastCol *pLastCol = tsdbCacheDeserialize(values_list[i]);
+    if (pLastCol) {
+      SColVal *pColVal = &pLastCol->colVal;
+      if (IS_VAR_DATA_TYPE(pColVal->type)) {
+        uint8_t *pVal = pColVal->value.pData;
+        if (pColVal->value.nData) {
+          pColVal->value.pData = taosMemoryMalloc(pColVal->value.nData);
+          memcpy(pColVal->value.pData, pVal, pColVal->value.nData);
+        }
+      }
+    } else {
+      // recalc: load from tsdb
+
+      // still null, then make up a null col value
+      int16_t cid = *(int16_t *)taosArrayGet(pCidList, i);
+      pLastCol = &(SLastCol){.ts = TSKEY_MIN, .colVal = COL_VAL_NONE(cid, pr->pSchema->columns[pr->pSlotIds[i]].type)};
 
+      // maybe store it back to rocks cache
+    }
     taosArrayPush(pLastArray, pLastCol);
 
     taosMemoryFree(values_list[i]);
diff --git a/source/dnode/vnode/src/tsdb/tsdbCacheRead.c b/source/dnode/vnode/src/tsdb/tsdbCacheRead.c
index 3d6bcd42e7c0c373421bf13b09fabc0dd7ea2f2c..48c72ca68546752c91c882d96790061a67e527c0 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCacheRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCacheRead.c
@@ -23,10 +23,9 @@
 static int32_t saveOneRow(SArray* pRow, SSDataBlock* pBlock, SCacheRowsReader* pReader, const int32_t* slotIds,
                           const int32_t* dstSlotIds, void** pRes, const char* idStr) {
   int32_t numOfRows = pBlock->info.rows;
+  bool    allNullRow = true;
 
   if (HASTYPE(pReader->type, CACHESCAN_RETRIEVE_LAST)) {
-    bool allNullRow = true;
-
     for (int32_t i = 0; i < pReader->numOfCols; ++i) {
       SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, dstSlotIds[i]);
       SFirstLastRes*   p = (SFirstLastRes*)varDataVal(pRes[i]);
@@ -42,6 +41,7 @@ static int32_t saveOneRow(SArray* pRow, SSDataBlock* pBlock, SCacheRowsReader* p
           varDataSetLen(p->buf, pColVal->colVal.value.nData);
           memcpy(varDataVal(p->buf), pColVal->colVal.value.pData, pColVal->colVal.value.nData);
           p->bytes = pColVal->colVal.value.nData + VARSTR_HEADER_SIZE;  // binary needs to plus the header size
+          taosMemoryFree(pColVal->colVal.value.pData);
         } else {
           memcpy(p->buf, &pColVal->colVal.value, pReader->pSchema->columns[slotId].bytes);
           p->bytes = pReader->pSchema->columns[slotId].bytes;
@@ -63,6 +63,10 @@ static int32_t saveOneRow(SArray* pRow, SSDataBlock* pBlock, SCacheRowsReader* p
       SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, i);
       SColVal*  pVal = &pColVal->colVal;
 
+      if (COL_VAL_IS_NONE(&pColVal->colVal)) {
+        continue;
+      }
+      allNullRow = false;
       if (IS_VAR_DATA_TYPE(pColVal->colVal.type)) {
         if (!COL_VAL_IS_VALUE(&pColVal->colVal)) {
           colDataSetNULL(pColInfoData, numOfRows);
@@ -71,13 +75,15 @@ static int32_t saveOneRow(SArray* pRow, SSDataBlock* pBlock, SCacheRowsReader* p
           // tsdbError("buf:%p len:%d index:%d", pReader->transferBuf[slotId], pVal->value.nData, slotId);
           memcpy(varDataVal(pReader->transferBuf[slotId]), pVal->value.pData, pVal->value.nData);
           colDataSetVal(pColInfoData, numOfRows, pReader->transferBuf[slotId], false);
+          taosMemoryFree(pVal->value.pData);
         }
       } else {
         colDataSetVal(pColInfoData, numOfRows, (const char*)&pVal->value.val, !COL_VAL_IS_VALUE(pVal));
       }
     }
 
-    pBlock->info.rows += 1;
+    pBlock->info.rows += allNullRow ? 0 : 1;
+    // pBlock->info.rows += 1;
   } else {
     tsdbError("invalid retrieve type:%d, %s", pReader->type, idStr);
     return TSDB_CODE_INVALID_PARA;
@@ -117,7 +123,7 @@ static int32_t setTableSchema(SCacheRowsReader* p, uint64_t suid, const char* id
 }
 
 int32_t tsdbCacherowsReaderOpen(void* pVnode, int32_t type, void* pTableIdList, int32_t numOfTables, int32_t numOfCols,
-                                SArray* pCidList, uint64_t suid, void** pReader, const char* idstr) {
+                                SArray* pCidList, int32_t* pSlotIds, uint64_t suid, void** pReader, const char* idstr) {
   *pReader = NULL;
   SCacheRowsReader* p = taosMemoryCalloc(1, sizeof(SCacheRowsReader));
   if (p == NULL) {
@@ -130,6 +136,7 @@ int32_t tsdbCacherowsReaderOpen(void* pVnode, int32_t type, void* pTableIdList,
   p->verRange = (SVersionRange){.minVer = 0, .maxVer = UINT64_MAX};
   p->numOfCols = numOfCols;
   p->pCidList = pCidList;
+  p->pSlotIds = pSlotIds;
   p->suid = suid;
 
   if (numOfTables == 0) {
@@ -294,6 +301,11 @@ int32_t tsdbRetrieveCacheRows(void* pReader, SSDataBlock* pResBlock, const int32
         taosArrayClear(pRow);
         continue;
       }
+      SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, 0);
+      if (COL_VAL_IS_NONE(&pColVal->colVal)) {
+        taosArrayClear(pRow);
+        continue;
+      }
 
       {
         bool    hasNotNullRow = true;
@@ -363,6 +375,11 @@ int32_t tsdbRetrieveCacheRows(void* pReader, SSDataBlock* pResBlock, const int32
         taosArrayClear(pRow);
         continue;
       }
+      SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, 0);
+      if (COL_VAL_IS_NONE(&pColVal->colVal)) {
+        taosArrayClear(pRow);
+        continue;
+      }
 
       saveOneRow(pRow, pResBlock, pr, slotIds, dstSlotIds, pRes, pr->idstr);
       taosArrayClear(pRow);
diff --git a/source/libs/executor/src/cachescanoperator.c b/source/libs/executor/src/cachescanoperator.c
index 2df24463b7609ac37fcb426190f1c24a06b6d67f..925e3054505af7039a6c3d00672880aebca0ebce 100644
--- a/source/libs/executor/src/cachescanoperator.c
+++ b/source/libs/executor/src/cachescanoperator.c
@@ -101,8 +101,8 @@ SOperatorInfo* createCacherowsScanOperator(SLastRowScanPhysiNode* pScanNode, SRe
 
     uint64_t suid = tableListGetSuid(pTableListInfo);
     code = tsdbCacherowsReaderOpen(pInfo->readHandle.vnode, pInfo->retrieveType, pList, totalTables,
-                                   taosArrayGetSize(pInfo->matchInfo.pList), pCidList, suid, &pInfo->pLastrowReader,
-                                   pTaskInfo->id.str);
+                                   taosArrayGetSize(pInfo->matchInfo.pList), pCidList, pInfo->pSlotIds, suid,
+                                   &pInfo->pLastrowReader, pTaskInfo->id.str);
     if (code != TSDB_CODE_SUCCESS) {
       goto _error;
     }
@@ -237,7 +237,7 @@ SSDataBlock* doScanCache(SOperatorInfo* pOperator) {
       }
 
       code = tsdbCacherowsReaderOpen(pInfo->readHandle.vnode, pInfo->retrieveType, pList, num,
-                                     taosArrayGetSize(pInfo->matchInfo.pList), pInfo->pCidList, suid,
+                                     taosArrayGetSize(pInfo->matchInfo.pList), pInfo->pCidList, pInfo->pSlotIds, suid,
                                      &pInfo->pLastrowReader, pTaskInfo->id.str);
       if (code != TSDB_CODE_SUCCESS) {
         pInfo->currentGroupIndex += 1;