diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index 094f18b7465a6827b9c894b37926389712ce2e77..461504facfd90f34d4c57e38579ac49cfb5b30d1 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -327,15 +327,16 @@ typedef struct SFSNextRowIter {
   SArray          *aBlockIdx;
   // SMapData         blockIdxMap;
   //  SBlockIdx  blockIdx;
-  SBlockIdx *pBlockIdx;
-  SMapData   blockMap;
-  int32_t    nBlock;
-  int32_t    iBlock;
-  SBlock     block;
-  SBlockData blockData;
-  int32_t    nRow;
-  int32_t    iRow;
-  TSDBROW    row;
+  SBlockIdx  *pBlockIdx;
+  SMapData    blockMap;
+  int32_t     nBlock;
+  int32_t     iBlock;
+  SBlock      block;
+  SBlockData  blockData;
+  SBlockData *pBlockData;
+  int32_t     nRow;
+  int32_t     iRow;
+  TSDBROW     row;
 } SFSNextRowIter;
 
 static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow) {
@@ -346,14 +347,20 @@ static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow) {
     case SFSNEXTROW_FS:
       state->aDFileSet = state->pTsdb->fs->cState->aDFileSet;
       state->nFileSet = taosArrayGetSize(state->aDFileSet);
-      state->iFileSet = state->nFileSet;
+      state->iFileSet = state->nFileSet - 1;
+
+      state->pBlockData = NULL;
 
     case SFSNEXTROW_FILESET: {
       SDFileSet *pFileSet = NULL;
       if (--state->iFileSet >= 0) {
         pFileSet = (SDFileSet *)taosArrayGet(state->aDFileSet, state->iFileSet);
       } else {
-        tBlockDataClear(&state->blockData);
+        // tBlockDataClear(&state->blockData);
+        if (state->pBlockData) {
+          tBlockDataClear(state->pBlockData);
+          state->pBlockData = NULL;
+        }
 
         *ppRow = NULL;
         return code;
@@ -390,18 +397,23 @@ static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow) {
       state->nBlock = state->blockMap.nItem;
       state->iBlock = state->nBlock - 1;
 
-      tBlockDataInit(&state->blockData);
+      if (!state->pBlockData) {
+        state->pBlockData = &state->blockData;
+
+        tBlockDataInit(&state->blockData);
+      }
     }
     case SFSNEXTROW_BLOCKDATA:
       if (state->iBlock >= 0) {
         SBlock block = {0};
 
         tBlockReset(&block);
-        tBlockDataReset(&state->blockData);
+        // tBlockDataReset(&state->blockData);
+        tBlockDataReset(state->pBlockData);
 
         tMapDataGetItemByIdx(&state->blockMap, state->iBlock, &block, tGetBlock);
         /* code = tsdbReadBlockData(state->pDataFReader, &state->blockIdx, &block, &state->blockData, NULL, NULL); */
-        code = tsdbReadBlockData(state->pDataFReader, state->pBlockIdx, &block, &state->blockData, NULL, NULL);
+        code = tsdbReadBlockData(state->pDataFReader, state->pBlockIdx, &block, state->pBlockData, NULL, NULL);
         if (code) goto _err;
 
         state->nRow = state->blockData.nRow;
@@ -411,15 +423,18 @@ static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow) {
       }
     case SFSNEXTROW_BLOCKROW:
       if (state->iRow >= 0) {
-        state->row = tsdbRowFromBlockData(&state->blockData, state->iRow);
+        state->row = tsdbRowFromBlockData(state->pBlockData, state->iRow);
         *ppRow = &state->row;
 
         if (--state->iRow < 0) {
           state->state = SFSNEXTROW_BLOCKDATA;
           if (--state->iBlock < 0) {
             tsdbDataFReaderClose(&state->pDataFReader);
+            state->pDataFReader = NULL;
+
             if (state->aBlockIdx) {
               taosArrayDestroy(state->aBlockIdx);
+              state->aBlockIdx = NULL;
             }
 
             state->state = SFSNEXTROW_FILESET;
@@ -436,17 +451,48 @@ static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow) {
 _err:
   if (state->pDataFReader) {
     tsdbDataFReaderClose(&state->pDataFReader);
+    state->pDataFReader = NULL;
   }
   if (state->aBlockIdx) {
     taosArrayDestroy(state->aBlockIdx);
+    state->aBlockIdx = NULL;
+  }
+  if (state->pBlockData) {
+    // tBlockDataClear(&state->blockData);
+    tBlockDataClear(state->pBlockData);
+    state->pBlockData = NULL;
   }
-  tBlockDataClear(&state->blockData);
 
   *ppRow = NULL;
 
   return code;
 }
 
+int32_t clearNextRowFromFS(void *iter) {
+  int32_t code = 0;
+
+  SFSNextRowIter *state = (SFSNextRowIter *)iter;
+  if (!state) {
+    return code;
+  }
+
+  if (state->pDataFReader) {
+    tsdbDataFReaderClose(&state->pDataFReader);
+    state->pDataFReader = NULL;
+  }
+  if (state->aBlockIdx) {
+    taosArrayDestroy(state->aBlockIdx);
+    state->aBlockIdx = NULL;
+  }
+  if (state->pBlockData) {
+    // tBlockDataClear(&state->blockData);
+    tBlockDataClear(state->pBlockData);
+    state->pBlockData = NULL;
+  }
+
+  return code;
+}
+
 typedef enum SMEMNEXTROWSTATES {
   SMEMNEXTROW_ENTER,
   SMEMNEXTROW_NEXT,
@@ -566,17 +612,20 @@ static bool tsdbKeyDeleted(TSDBKEY *key, SArray *pSkyline, int *iSkyline) {
 }
 
 typedef int32_t (*_next_row_fn_t)(void *iter, TSDBROW **ppRow);
+typedef int32_t (*_next_row_clear_fn_t)(void *iter);
 
 typedef struct TsdbNextRowState {
-  TSDBROW       *pRow;
-  bool           stop;
-  bool           next;
-  void          *iter;
-  _next_row_fn_t nextRowFn;
+  TSDBROW             *pRow;
+  bool                 stop;
+  bool                 next;
+  void                *iter;
+  _next_row_fn_t       nextRowFn;
+  _next_row_clear_fn_t nextRowClearFn;
 } TsdbNextRowState;
 
 static int32_t mergeLastRow(tb_uid_t uid, STsdb *pTsdb, bool *dup, STSRow **ppRow) {
   int32_t code = 0;
+  SArray *pSkyline = NULL;
 
   STSchema *pTSchema = metaGetTbTSchema(pTsdb->pVnode->pMeta, uid, -1);
   int16_t   nCol = pTSchema->numOfCols;
@@ -596,7 +645,7 @@ static int32_t mergeLastRow(tb_uid_t uid, STsdb *pTsdb, bool *dup, STSRow **ppRo
 
   *ppRow = NULL;
 
-  SArray *pSkyline = taosArrayInit(32, sizeof(TSDBKEY));
+  pSkyline = taosArrayInit(32, sizeof(TSDBKEY));
 
   SDelIdx delIdx;
 
@@ -632,9 +681,9 @@ static int32_t mergeLastRow(tb_uid_t uid, STsdb *pTsdb, bool *dup, STSRow **ppRo
   SMemNextRowIter imemState = {0};
   TSDBROW         memRow, imemRow, fsRow;
 
-  TsdbNextRowState input[3] = {{&memRow, true, false, &memState, getNextRowFromMem},
-                               {&imemRow, true, false, &imemState, getNextRowFromMem},
-                               {&fsRow, false, true, &fsState, getNextRowFromFS}};
+  TsdbNextRowState input[3] = {{&memRow, true, false, &memState, getNextRowFromMem, NULL},
+                               {&imemRow, true, false, &imemState, getNextRowFromMem, NULL},
+                               {&fsRow, false, true, &fsState, getNextRowFromFS, clearNextRowFromFS}};
 
   if (pMem) {
     memState.pMem = pMem;
@@ -732,10 +781,21 @@ static int32_t mergeLastRow(tb_uid_t uid, STsdb *pTsdb, bool *dup, STSRow **ppRo
 
   } while (*ppRow == NULL);
 
+  for (int i = 0; i < 3; ++i) {
+    if (input[i].nextRowClearFn) {
+      input[i].nextRowClearFn(input[i].iter);
+    }
+  }
+  if (pSkyline) {
+    taosArrayDestroy(pSkyline);
+  }
   taosMemoryFreeClear(pTSchema);
 
   return code;
 _err:
+  if (pSkyline) {
+    taosArrayDestroy(pSkyline);
+  }
   taosMemoryFreeClear(pTSchema);
   tsdbError("vgId:%d merge last_row failed since %s", TD_VID(pTsdb->pVnode), tstrerror(code));
   return code;
@@ -798,9 +858,9 @@ static int32_t mergeLast(tb_uid_t uid, STsdb *pTsdb, STSRow **ppRow) {
   SMemNextRowIter imemState = {0};
   TSDBROW         memRow, imemRow, fsRow;
 
-  TsdbNextRowState input[3] = {{&memRow, true, false, &memState, getNextRowFromMem},
-                               {&imemRow, true, false, &imemState, getNextRowFromMem},
-                               {&fsRow, false, true, &fsState, getNextRowFromFS}};
+  TsdbNextRowState input[3] = {{&memRow, true, false, &memState, getNextRowFromMem, NULL},
+                               {&imemRow, true, false, &imemState, getNextRowFromMem, NULL},
+                               {&fsRow, false, true, &fsState, getNextRowFromFS, clearNextRowFromFS}};
 
   if (pMem) {
     memState.pMem = pMem;
@@ -1008,7 +1068,7 @@ int32_t tsdbCacheGetLastrowH(SLRUCache *pCache, tb_uid_t uid, STsdb *pTsdb, LRUH
     code = mergeLastRow(uid, pTsdb, &dup, &pRow);
     // if table's empty or error, return code of -1
     if (code < 0 || pRow == NULL) {
-      if (!dup) {
+      if (!dup && pRow) {
         taosMemoryFree(pRow);
       }