diff --git a/source/dnode/vnode/src/tsdb/tsdbCacheRead.c b/source/dnode/vnode/src/tsdb/tsdbCacheRead.c
index be36848fec..791c73047c 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCacheRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCacheRead.c
@@ -30,36 +30,69 @@ typedef struct SCacheRowsReader {
 } SCacheRowsReader;
 
 static void saveOneRow(SArray* pRow, SSDataBlock* pBlock, SCacheRowsReader* pReader, const int32_t* slotIds,
-                       SFirstLastRes** pRes) {
+                       void** pRes) {
   ASSERT(pReader->numOfCols <= taosArrayGetSize(pBlock->pDataBlock));
   int32_t numOfRows = pBlock->info.rows;
 
-  for (int32_t i = 0; i < pReader->numOfCols; ++i) {
-    SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, i);
+  if ((pReader->type & CACHESCAN_RETRIEVE_LAST) == CACHESCAN_RETRIEVE_LAST) {
+    for (int32_t i = 0; i < pReader->numOfCols; ++i) {
+      SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, i);
+      SFirstLastRes*   p = (SFirstLastRes*)varDataVal(pRes[i]);
 
-    if (slotIds[i] == -1) {  // the primary timestamp
-      SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, 0);
-      pRes[i]->ts = pColVal->ts;
-      memcpy(pRes[i]->buf, &pColVal->ts, TSDB_KEYSIZE);
-    } else {
-      int32_t   slotId = slotIds[i];
-      SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, slotId);
+      if (slotIds[i] == -1) {  // the primary timestamp
+        SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, 0);
+        p->ts = pColVal->ts;
+        p->bytes = TSDB_KEYSIZE;
+        *(int64_t*)p->buf = pColVal->ts;
+      } else {
+        int32_t   slotId = slotIds[i];
+        SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, slotId);
 
-      pRes[i]->ts = pColVal->ts;
-      pRes[i]->isNull = !COL_VAL_IS_VALUE(&pColVal->colVal);
+        p->ts = pColVal->ts;
+        p->isNull = !COL_VAL_IS_VALUE(&pColVal->colVal);
+        if (!p->isNull) {
+          if (IS_VAR_DATA_TYPE(pColVal->colVal.type)) {
+            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;
+          } else {
+            memcpy(p->buf, &pColVal->colVal.value, pReader->pSchema->columns[slotId].bytes);
+            p->bytes = pReader->pSchema->columns[slotId].bytes;
+          }
+        }
+      }
 
-      if (!pRes[i]->isNull) {
-        if (IS_VAR_DATA_TYPE(pColVal->colVal.type)) {
-          varDataSetLen(pRes[i]->buf, pColVal->colVal.value.nData);
-          memcpy(varDataVal(pRes[i]->buf), pColVal->colVal.value.pData, pColVal->colVal.value.nData);
+      p->hasResult = true;
+      varDataSetLen(pRes[i], pColInfoData->info.bytes);
+      colDataAppend(pColInfoData, numOfRows, (const char*)pRes[i], false);
+    }
+  } else {
+    ASSERT((pReader->type & CACHESCAN_RETRIEVE_LAST_ROW) == CACHESCAN_RETRIEVE_LAST_ROW);
+
+    SColVal colVal = {0};
+    for (int32_t i = 0; i < pReader->numOfCols; ++i) {
+      SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, i);
+
+      if (slotIds[i] == -1) {
+        SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, 0);
+        colDataAppend(pColInfoData, numOfRows, (const char*)&pColVal->ts, false);
+      } else {
+        int32_t   slotId = slotIds[i];
+        SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, slotId);
+
+        if (IS_VAR_DATA_TYPE(colVal.type)) {
+          if (!COL_VAL_IS_VALUE(&pColVal->colVal)) {
+            colDataAppendNULL(pColInfoData, numOfRows);
+          } else {
+            varDataSetLen(pReader->transferBuf[slotId], colVal.value.nData);
+            memcpy(varDataVal(pReader->transferBuf[slotId]), colVal.value.pData, colVal.value.nData);
+            colDataAppend(pColInfoData, numOfRows, pReader->transferBuf[slotId], false);
+          }
         } else {
-          memcpy(pRes[i]->buf, &pColVal->colVal.value, pReader->pSchema->columns[slotId].bytes);
+          colDataAppend(pColInfoData, numOfRows, (const char*)&colVal.value, !COL_VAL_IS_VALUE(&pColVal->colVal));
         }
       }
     }
-
-    pRes[i]->hasResult = true;
-    colDataAppend(pColInfoData, numOfRows, (const char*)pRes[i], false);
   }
 
   pBlock->info.rows += 1;
@@ -126,24 +159,17 @@ static int32_t doExtractCacheRow(SCacheRowsReader* pr, SLRUCache* lruCache, uint
   int32_t code = TSDB_CODE_SUCCESS;
   if ((pr->type & CACHESCAN_RETRIEVE_LAST_ROW) == CACHESCAN_RETRIEVE_LAST_ROW) {
     code = tsdbCacheGetLastrowH(lruCache, uid, pr->pVnode->pTsdb, h);
-    if (code != TSDB_CODE_SUCCESS) {
-      return code;
-    }
-
-    // no data in the table of Uid
-    if (*h != NULL) {
-      *pRow = (SArray*)taosLRUCacheValue(lruCache, *h);
-    }
   } else {
     code = tsdbCacheGetLastH(lruCache, uid, pr->pVnode->pTsdb, h);
-    if (code != TSDB_CODE_SUCCESS) {
-      return code;
-    }
+  }
 
-    // no data in the table of Uid
-    if (*h != NULL) {
-      *pRow = (SArray*)taosLRUCacheValue(lruCache, *h);
-    }
+  if (code != TSDB_CODE_SUCCESS) {
+    return code;
+  }
+
+  // no data in the table of Uid
+  if (*h != NULL) {
+    *pRow = (SArray*)taosLRUCacheValue(lruCache, *h);
   }
 
   return code;
@@ -163,10 +189,26 @@ int32_t tsdbRetrieveCacheRows(void* pReader, SSDataBlock* pResBlock, const int32
   size_t     numOfTables = taosArrayGetSize(pr->pTableList);
   bool       hasRes = false;
 
-  SFirstLastRes** pRes = taosMemoryCalloc(pr->numOfCols, POINTER_BYTES);
+  void** pRes = taosMemoryCalloc(pr->numOfCols, POINTER_BYTES);
   for (int32_t j = 0; j < pr->numOfCols; ++j) {
-    pRes[j] = taosMemoryCalloc(1, sizeof(SFirstLastRes) + pr->pSchema->columns[slotIds[j]].bytes);
-    pRes[j]->ts = INT64_MIN;
+    pRes[j] = taosMemoryCalloc(1, sizeof(SFirstLastRes) + pr->pSchema->columns[slotIds[j]].bytes + VARSTR_HEADER_SIZE);
+    SFirstLastRes* p = (SFirstLastRes*)varDataVal(pRes[j]);
+    p->ts = INT64_MIN;
+  }
+
+  SArray* pLastCols = taosArrayInit(pr->pSchema->numOfCols, sizeof(SLastCol));
+  for (int32_t i = 0; i < pr->numOfCols; ++i) {
+    SLastCol p = {0};
+    p.ts = INT64_MIN;
+
+    struct STColumn* pCol = &pr->pSchema->columns[i];
+    p.colVal.type = pCol->type;
+
+    if (IS_VAR_DATA_TYPE(pCol->type)) {
+      p.colVal.value.pData = taosMemoryCalloc(pCol->bytes, sizeof(char));
+    }
+
+    taosArrayPush(pLastCols, &p);
   }
 
   // retrieve the only one last row of all tables in the uid list.
@@ -185,38 +227,32 @@ int32_t tsdbRetrieveCacheRows(void* pReader, SSDataBlock* pResBlock, const int32
 
       {
         for (int32_t k = 0; k < pr->numOfCols; ++k) {
-          SColumnInfoData* pColInfoData = taosArrayGet(pResBlock->pDataBlock, k);
-
+          SLastCol* p = taosArrayGet(pLastCols, k);
           if (slotIds[k] == -1) {  // the primary timestamp
-            SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, k);
-            if (pColVal->ts > pRes[k]->ts || !pRes[k]->hasResult) {
+            SLastCol* pCol = (SLastCol*)taosArrayGet(pRow, k);
+            if (pCol->ts > p->ts) {
               hasRes = true;
-              pRes[k]->hasResult = true;
-              pRes[k]->ts = pColVal->ts;
-              memcpy(pRes[k]->buf, &pColVal->ts, TSDB_KEYSIZE);
-
-              colDataAppend(pColInfoData, 1, (const char*)pRes[k], false);
+              p->ts = pCol->ts;
+              p->colVal = pCol->colVal;
             }
           } else {
             int32_t   slotId = slotIds[k];
             SLastCol* pColVal = (SLastCol*)taosArrayGet(pRow, slotId);
 
-            if (pColVal->ts > pRes[k]->ts || !pRes[k]->hasResult) {
+            if (pColVal->ts > p->ts) {
               hasRes = true;
-              pRes[k]->hasResult = true;
-              pRes[k]->ts = pColVal->ts;
+              p->ts = pColVal->ts;
 
-              pRes[k]->isNull = !COL_VAL_IS_VALUE(&pColVal->colVal);
-              if (!pRes[k]->isNull) {
+              if (!COL_VAL_IS_VALUE(&pColVal->colVal)) {
                 if (IS_VAR_DATA_TYPE(pColVal->colVal.type)) {
-                  varDataSetLen(pRes[k]->buf, pColVal->colVal.value.nData);
-                  memcpy(varDataVal(pRes[k]->buf), pColVal->colVal.value.pData, pColVal->colVal.value.nData);
+                  uint8_t* px = p->colVal.value.pData;
+                  p->colVal = pColVal->colVal;
+                  p->colVal.value.pData = px;
+                  memcpy(px, pColVal->colVal.value.pData, pColVal->colVal.value.nData);
                 } else {
-                  memcpy(pRes[k]->buf, &pColVal->colVal.value, pr->pSchema->columns[slotId].bytes);
+                  p->colVal = pColVal->colVal;
                 }
               }
-
-              colDataAppend(pColInfoData, 1, (const char*)pRes[k], false);
             }
           }
         }
@@ -227,6 +263,7 @@ int32_t tsdbRetrieveCacheRows(void* pReader, SSDataBlock* pResBlock, const int32
 
     if (hasRes) {
       pResBlock->info.rows = 1;
+      saveOneRow(pLastCols, pResBlock, pr, slotIds, pRes);
     }
 
   } else if ((pr->type & CACHESCAN_RETRIEVE_TYPE_ALL) == CACHESCAN_RETRIEVE_TYPE_ALL) {
diff --git a/source/libs/planner/src/planOptimizer.c b/source/libs/planner/src/planOptimizer.c
index 0fc1be8a70..7a145e7dde 100644
--- a/source/libs/planner/src/planOptimizer.c
+++ b/source/libs/planner/src/planOptimizer.c
@@ -2232,6 +2232,7 @@ static int32_t lastRowScanOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogic
     cxt.doAgg = false;
     nodesWalkExprs(pScan->pScanCols, lastRowScanOptSetColDataType, &cxt);
     nodesWalkExprs(pScan->pScanPseudoCols, lastRowScanOptSetColDataType, &cxt);
+    nodesWalkExprs(pScan->node.pTargets, lastRowScanOptSetColDataType, &cxt);
     nodesClearList(cxt.pLastCols);
   }
   pAgg->hasLastRow = false;