diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index 030f7a09509ae56e8fc8973646cec4719f2c4fff..06397fc724e4125bb82ad93738ae9f8991806085 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -368,20 +368,20 @@ typedef struct {
 } SCacheFlushState;
 
 struct STsdb {
-  char            *path;
-  SVnode          *pVnode;
-  STsdbKeepCfg     keepCfg;
-  TdThreadRwlock   rwLock;
-  SMemTable       *mem;
-  SMemTable       *imem;
-  STsdbFS          fs;    // old
-  SLRUCache       *lruCache;
-  SCacheFlushState flushState;
-  TdThreadMutex    lruMutex;
-  SLRUCache       *biCache;
-  TdThreadMutex    biMutex;
+  char                *path;
+  SVnode              *pVnode;
+  STsdbKeepCfg         keepCfg;
+  TdThreadRwlock       rwLock;
+  SMemTable           *mem;
+  SMemTable           *imem;
+  STsdbFS              fs;  // old
+  SLRUCache           *lruCache;
+  SCacheFlushState     flushState;
+  TdThreadMutex        lruMutex;
+  SLRUCache           *biCache;
+  TdThreadMutex        biMutex;
   struct STFileSystem *pFS;  // new
-  SRocksCache      rCache;
+  SRocksCache          rCache;
 };
 
 struct TSDBKEY {
@@ -659,12 +659,19 @@ struct SDelFWriter {
   uint8_t *aBuf[1];
 };
 
+#include "tarray2.h"
+//#include "tsdbFS2.h"
+// struct STFileSet;
+typedef struct STFileSet STFileSet;
+typedef TARRAY2(STFileSet *) TFileSetArray;
+
 struct STsdbReadSnap {
-  SMemTable  *pMem;
-  SQueryNode *pNode;
-  SMemTable  *pIMem;
-  SQueryNode *pINode;
-  STsdbFS     fs;
+  SMemTable     *pMem;
+  SQueryNode    *pNode;
+  SMemTable     *pIMem;
+  SQueryNode    *pINode;
+  TFileSetArray *pfSetArray;
+  STsdbFS        fs;
 };
 
 struct SDataFWriter {
@@ -777,7 +784,7 @@ struct SDiskDataBuilder {
 typedef struct SLDataIter {
   SRBTreeNode            node;
   SSttBlk               *pSttBlk;
-  int32_t                iStt;       // for debug purpose
+  int32_t                iStt;  // for debug purpose
   int8_t                 backward;
   int32_t                iSttBlk;
   int32_t                iRow;
@@ -796,22 +803,22 @@ int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader *pFRead
                        bool destroyLoadInfo, const char *idStr, bool strictTimeRange, SLDataIter *pLDataIter);
 
 typedef struct {
-  int8_t         backward;
-  STsdb         *pTsdb;
-  uint64_t       suid;
-  uint64_t       uid;
-  STimeWindow    timewindow;
-  SVersionRange  verRange;
-  bool           strictTimeRange;
-  SArray        *pSttFileBlockIterArray;
-  void          *pCurrentFileset;
-  STSchema      *pSchema;
-  int16_t       *pCols;
-  int32_t        numOfCols;
-  void          *pReader;
-  void          *idstr;
+  int8_t        backward;
+  STsdb        *pTsdb;
+  uint64_t      suid;
+  uint64_t      uid;
+  STimeWindow   timewindow;
+  SVersionRange verRange;
+  bool          strictTimeRange;
+  SArray       *pSttFileBlockIterArray;
+  void         *pCurrentFileset;
+  STSchema     *pSchema;
+  int16_t      *pCols;
+  int32_t       numOfCols;
+  void         *pReader;
+  void         *idstr;
 } SMergeTreeConf;
-int32_t tMergeTreeOpen2(SMergeTree *pMTree, SMergeTreeConf* pConf);
+int32_t tMergeTreeOpen2(SMergeTree *pMTree, SMergeTreeConf *pConf);
 
 void tMergeTreeAddIter(SMergeTree *pMTree, SLDataIter *pIter);
 bool tMergeTreeNext(SMergeTree *pMTree);
@@ -827,29 +834,28 @@ void              *destroySttBlockReader(SArray *pLDataIterArray, int64_t *block
 
 // tsdbCache ==============================================================================================
 typedef struct SCacheRowsReader {
-  STsdb             *pTsdb;
-  SVersionRange      verRange;
-  TdThreadMutex      readerMutex;
-  SVnode            *pVnode;
-  STSchema          *pSchema;
-  STSchema          *pCurrSchema;
-  uint64_t           uid;
-  uint64_t           suid;
-  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
-  int32_t            numOfTables;
-  SSttBlockLoadInfo *pLoadInfo;
-  SLDataIter        *pDataIter;
-  STsdbReadSnap     *pReadSnap;
-  SDataFReader      *pDataFReader;
-  SDataFReader      *pDataFReaderLast;
-  const char        *idstr;
-  int64_t            lastTs;
+  STsdb         *pTsdb;
+  SVersionRange  verRange;
+  TdThreadMutex  readerMutex;
+  SVnode        *pVnode;
+  STSchema      *pSchema;
+  STSchema      *pCurrSchema;
+  uint64_t       uid;
+  uint64_t       suid;
+  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
+  int32_t        numOfTables;
+  SArray        *pLDataIterArray;
+  STsdbReadSnap *pReadSnap;
+  SDataFReader  *pDataFReader;
+  SDataFReader  *pDataFReaderLast;
+  char          *idstr;
+  int64_t        lastTs;
 } SCacheRowsReader;
 
 typedef struct {
diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index 52ad923fcaeb1b9f4748731a673707a7cd8a2219..d9e7c1883a4363fa0eca7e00250b889b1d3474ad 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -13,6 +13,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 #include "tsdb.h"
+#include "tsdbDataFileRW.h"
 #include "vnd.h"
 
 #define ROCKS_BATCH_SIZE (4096)
@@ -1714,201 +1715,327 @@ _err:
   return code;
 }
 */
-typedef enum {
-  SFSLASTNEXTROW_FS,
-  SFSLASTNEXTROW_FILESET,
-  SFSLASTNEXTROW_BLOCKDATA,
-  SFSLASTNEXTROW_BLOCKROW
-} SFSLASTNEXTROWSTATES;
-
 typedef struct {
-  SFSLASTNEXTROWSTATES state;     // [input]
-  STsdb               *pTsdb;     // [input]
-  STSchema            *pTSchema;  // [input]
-  tb_uid_t             suid;
-  tb_uid_t             uid;
-  int32_t              nFileSet;
-  int32_t              iFileSet;
-  SArray              *aDFileSet;
-  SDataFReader       **pDataFReader;
-  TSDBROW              row;
-
-  bool               checkRemainingRow;
-  SMergeTree         mergeTree;
-  SMergeTree        *pMergeTree;
-  SSttBlockLoadInfo *pLoadInfo;
-  SLDataIter        *pDataIter;
-  int64_t            lastTs;
-} SFSLastNextRowIter;
-
-static int32_t getNextRowFromFSLast(void *iter, TSDBROW **ppRow, bool *pIgnoreEarlierTs, bool isLast, int16_t *aCols,
-                                    int nCols) {
-  SFSLastNextRowIter *state = (SFSLastNextRowIter *)iter;
-  int32_t             code = 0;
-  bool                checkRemainingRow = true;
+  SMergeTree  mergeTree;
+  SMergeTree *pMergeTree;
+} SFSLastIter;
 
-  switch (state->state) {
-    case SFSLASTNEXTROW_FS:
-      state->nFileSet = taosArrayGetSize(state->aDFileSet);
-      state->iFileSet = state->nFileSet;
+static int32_t lastIterClose(SFSLastIter **iter) {
+  int32_t code = 0;
 
-    case SFSLASTNEXTROW_FILESET: {
-      SDFileSet *pFileSet = NULL;
-    _next_fileset:
-      if (state->pMergeTree != NULL) {
-        tMergeTreeClose(state->pMergeTree);
-        state->pMergeTree = NULL;
-      }
+  if (iter->pMergeTree) {
+    tMergeTreeClose(iter->pMergeTree);
+    iter->pMergeTree = NULL;
+  }
 
-      if (--state->iFileSet >= 0) {
-        pFileSet = (SDFileSet *)taosArrayGet(state->aDFileSet, state->iFileSet);
-      } else {
-        *ppRow = NULL;
-        return code;
-      }
+  *iter = NULL;
 
-      if (*state->pDataFReader == NULL || (*state->pDataFReader)->pSet->fid != pFileSet->fid) {
-        if (*state->pDataFReader != NULL) {
-          tsdbDataFReaderClose(state->pDataFReader);
+  return code;
+}
 
-          resetLastBlockLoadInfo(state->pLoadInfo);
-        }
+static int32_t lastIterNext(SFSLastIter *iter, TSDBROW **ppRow, STsdb *pTsdb, STSchema *pTSchema, tb_uid_t suid,
+                            tb_uid_t uid, SCacheRowsReader *pr, int64_t lastTs, STFileSet *pFileSet, int16_t *aCols,
+                            int nCols) {
+  int32_t code = 0;
 
-        code = tsdbDataFReaderOpen(state->pDataFReader, state->pTsdb, pFileSet);
-        if (code) goto _err;
-      }
+  if (!iter->pMergeTree) {
+    int64_t loadBlocks = 0;
+    double  elapse = 0;
+    pr->pLDataIterArray = destroySttBlockReader(pr->pLDataIterArray, &loadBlocks, &elapse);
+    pr->pLDataIterArray = taosArrayInit(4, POINTER_BYTES);
+
+    SMergeTreeConf conf = {
+        .uid = uid,
+        .suid = suid,
+        .pTsdb = pTsdb,
+        .timewindow = (STimeWindow){.skey = lastTs, .ekey = TSKEY_MAX},
+        .verRange = (SVersionRange){.minVer = 0, .maxVer = UINT64_MAX},
+        .strictTimeRange = false,
+        .pSchema = pTSchema,
+        .pCurrentFileset = pFileSet,
+        .backward = 1,
+        .pSttFileBlockIterArray = pr->pLDataIterArray,
+        .pCols = aCols,
+        .numOfCols = nCols,
+        .pReader = pr,
+        .idstr = pr->idstr,
+    };
+
+    code = tMergeTreeOpen2(&iter->mergeTree, &conf);
+    if (code != TSDB_CODE_SUCCESS) {
+      return -1;
+    }
+
+    iter->pMergeTree = &iter->mergeTree;
+  }
+
+  // retrieve next row
+  bool hasVal = tMergeTreeNext(iter->pMergeTree);
+  if (!hasVal) {
+    *ppRow = NULL;
+    return code;
+  }
+
+  *ppRow = tMergeTreeGetRow(iter->pMergeTree);
+
+  return code;
+}
+
+typedef enum SFSNEXTROWSTATES {
+  SFSNEXTROW_FS,
+  SFSNEXTROW_FILESET,
+  SFSNEXTROW_INDEXLIST,
+  SFSNEXTROW_BRINBLOCK,
+  SFSNEXTROW_BRINRECORD,
+  SFSNEXTROW_BLOCKDATA,
+  SFSNEXTROW_BLOCKROW
+} SFSNEXTROWSTATES;
+
+struct CacheNextRowIter;
+
+typedef struct SFSNextRowIter {
+  SFSNEXTROWSTATES         state;         // [input]
+  STsdb                   *pTsdb;         // [input]
+  SBlockIdx               *pBlockIdxExp;  // [input]
+  STSchema                *pTSchema;      // [input]
+  tb_uid_t                 suid;
+  tb_uid_t                 uid;
+  int32_t                  nFileSet;
+  int32_t                  iFileSet;
+  STFileSet               *pFileSet;
+  TFileSetArray           *aDFileSet;
+  SDataFileReader         *pFileReader;
+  SArray                  *pIndexList;
+  int32_t                  iBrinIndex;
+  SBrinBlock               brinBlock;
+  int32_t                  iBrinRecord;
+  SBrinRecord              brinRecord;
+  SBlockData               blockData;
+  SBlockData              *pBlockData;
+  int32_t                  nRow;
+  int32_t                  iRow;
+  TSDBROW                  row;
+  int64_t                  lastTs;
+  SFSLastIter              lastIter;
+  SFSLastIter             *pLastIter;
+  TSDBROW                 *pLastRow;
+  struct CacheNextRowIter *pRowIter;
+} SFSNextRowIter;
+
+static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow, bool *pIgnoreEarlierTs, bool isLast, int16_t *aCols,
+                                int nCols) {
+  SFSNextRowIter *state = (SFSNextRowIter *)iter;
+  int32_t         code = 0;
+
+  if (SFSNEXTROW_FS == state->state) {
+    state->nFileSet = TARRAY2_SIZE(state->aDFileSet);
+    state->iFileSet = state->nFileSet;
+
+    state->state = SFSNEXTROW_FILESET;
+  }
 
-      int  nTmpCols = nCols;
-      bool hasTs = false;
-      if (aCols[0] == PRIMARYKEY_TIMESTAMP_COL_ID) {
-        --nTmpCols;
-        hasTs = true;
+  if (SFSNEXTROW_FILESET == state->state) {
+  _next_fileset:
+    if (--state->iFileSet < 0) {  // no fileset left, cleanup and return NULL row
+
+    } else {
+      state->pFileSet = TARRAY2_GET(state->aDFileSet, state->iFileSet);
+    }
+
+    STFileObj **pFileObj = pFileSet->farr;
+    if (pFileObj[0] != NULL || pFileObj[3] != NULL) {
+      SDataFileReaderConfig conf = {.tsdb = state->pTsdb, .szPage = state->pTsdb->pVnode->config.szPage};
+      const char           *filesName[4] = {0};
+      if (pFileObj[0] != NULL) {
+        conf.files[0].file = *pFileObj[0]->f;
+        conf.files[0].exist = true;
+        filesName[0] = pFileObj[0]->fname;
+
+        conf.files[1].file = *pFileObj[1]->f;
+        conf.files[1].exist = true;
+        filesName[1] = pFileObj[1]->fname;
+
+        conf.files[2].file = *pFileObj[2]->f;
+        conf.files[2].exist = true;
+        filesName[2] = pFileObj[2]->fname;
       }
-      for (int i = 0; i < state->pLoadInfo->numOfStt; ++i) {
-        state->pLoadInfo[i].colIds = hasTs ? aCols + 1 : aCols;
-        state->pLoadInfo[i].numOfCols = nTmpCols;
-        state->pLoadInfo[i].isLast = isLast;
+
+      if (pFileObj[3] != NULL) {
+        conf.files[3].exist = true;
+        conf.files[3].file = *pFileObj[3]->f;
+        filesName[3] = pFileObj[3]->fname;
       }
-      tMergeTreeOpen(&state->mergeTree, 1, *state->pDataFReader, state->suid, state->uid,
-                     &(STimeWindow){.skey = state->lastTs, .ekey = TSKEY_MAX},
-                     &(SVersionRange){.minVer = 0, .maxVer = UINT64_MAX}, state->pLoadInfo, false, NULL, true,
-                     state->pDataIter);
-      state->pMergeTree = &state->mergeTree;
-      state->state = SFSLASTNEXTROW_BLOCKROW;
-    }
-    case SFSLASTNEXTROW_BLOCKROW: {
-      if (nCols != state->pLoadInfo->numOfCols) {
-        for (int i = 0; i < state->pLoadInfo->numOfStt; ++i) {
-          state->pLoadInfo[i].numOfCols = nCols;
 
-          state->pLoadInfo[i].checkRemainingRow = state->checkRemainingRow;
-        }
+      code = tsdbDataFileReaderOpen(filesName, &conf, &state->pFileReader);
+      if (code != TSDB_CODE_SUCCESS) {
+        goto _err;
       }
-      bool hasVal = tMergeTreeNext(&state->mergeTree);
-      if (!hasVal) {
-        if (tMergeTreeIgnoreEarlierTs(&state->mergeTree)) {
-          *pIgnoreEarlierTs = true;
-          *ppRow = NULL;
-          return code;
-        }
-        state->state = SFSLASTNEXTROW_FILESET;
-        goto _next_fileset;
+
+      // TODO: load tomb data from data and sttt
+      state->pLastIter = &state->lastIter;
+
+      if (!state->pIndexList) {
+        state->pIndexList = taosArrayInit(1, sizeof(SBrinBlk));
+      } else {
+        taosArrayClear(state->pIndexList);
       }
-      state->row = *tMergeTreeGetRow(&state->mergeTree);
-      *ppRow = &state->row;
+      const TBrinBlkArray *pBlkArray = NULL;
 
-      if (TSDBROW_TS(&state->row) <= state->lastTs) {
-        *pIgnoreEarlierTs = true;
-        *ppRow = NULL;
-        return code;
+      int32_t code = tsdbDataFileReadBrinBlk(state->pFileReader, &pBlkArray);
+      if (code != TSDB_CODE_SUCCESS) {
+        goto _err;
       }
 
-      *pIgnoreEarlierTs = false;
-      /*
-      if (!hasVal) {
-        state->state = SFSLASTNEXTROW_FILESET;
+      for (int i = TARRAY2_SIZE(pBlkArray); i >= 0; --i) {
+        SBrinBlk *pBrinBlk = &pBlkArray->data[i];
+        if (state->suid >= pBrinBlk->minTbid.suid && state->suid <= pBrinBlk->maxTbid.suid) {
+          if (state->uid >= pBrinBlk->minTbid.uid && state->uid <= pBrinBlk->maxTbid.uid) {
+            taosArrayPush(state->pIndexList, pBrinBlk);
+          }
+        } else if (state->suid > pBrinBlk->maxTbid.suid ||
+                   (state->suid == pBrinBlk->maxTbid.suid && state->uid > pBrinBlk->maxTbid.uid)) {
+          break;
+        }
       }
-      */
-      if (!state->checkRemainingRow) {
-        state->checkRemainingRow = true;
+
+      int indexSize = TARRAY_SIZE(state->pIndexList);
+      if (indexSize <= 0) {
+        // goto next fileset
       }
-      return code;
+
+      state->state = SFSNEXTROW_INDEXLIST;
+      state->iBrinIndex = indexSize;
+    } else {  // empty fileset, goto next fileset
     }
-    default:
-      ASSERT(0);
-      break;
   }
 
-_err:
-  /*if (state->pDataFReader) {
-    tsdbDataFReaderClose(&state->pDataFReader);
-    state->pDataFReader = NULL;
-    }*/
-  if (state->pMergeTree != NULL) {
-    tMergeTreeClose(state->pMergeTree);
-    state->pMergeTree = NULL;
+  if (SFSNEXTROW_INDEXLIST == state->state) {
+    SBrinBlk *pBrinBlk = NULL;
+  _next_brinindex:
+    if (--state->iBrinIndex < 0) {  // no index left, goto next fileset
+    } else {
+      pBrinBlk = taosArrayGet(state->pIndexList, state->iBrinIndex);
+    }
+
+    code = tsdbDataFileReadBrinBlock(state->pFileReader, pBrinBlk, &state->brinBlock);
+    if (code != TSDB_CODE_SUCCESS) {
+      goto _err;
+    }
+
+    state->iBrinRecord = BRIN_BLOCK_SIZE(&state->brinBlock) - 1;
+    state->state = SFSNEXTROW_BRINBLOCK;
   }
 
-  *ppRow = NULL;
+  if (SFSNEXTROW_BRINBLOCK == state->state) {
+  _next_brinrecord:
+    if (state->iBrinRecord < 0) {  // empty brin block, goto _next_brinindex
+      tBrinBlockClear(&state->brinBlock);
+      goto _next_brinindex;
+    }
+    code = tBrinBlockGet(&state->brinBlock, state->iBrinRecord, &state->brinRecord);
+    if (code != TSDB_CODE_SUCCESS) {
+      goto _err;
+    }
 
-  return code;
-}
+    SBrinRecord *pRecord = &state->brinRecord;
+    if (pRecord->uid != state->uid) {
+      // TODO: goto next brin block early
+      --state->iBrinRecord;
+      goto _next_brinrecord;
+    }
 
-int32_t clearNextRowFromFSLast(void *iter) {
-  SFSLastNextRowIter *state = (SFSLastNextRowIter *)iter;
-  int32_t             code = 0;
+    state->state = SFSNEXTROW_BRINRECORD;
+  }
 
-  if (!state) {
-    return code;
+  if (SFSNEXTROW_BRINRECORD == state->state) {
+    SBrinRecord *pRecord = &state->brinRecord;
+
+    if (!state->pBlockData) {
+      state->pBlockData = &state->blockData;
+      code = tBlockDataCreate(&state->blockData);
+      if (code) goto _err;
+    } else {
+      tBlockDataReset(state->pBlockData);
+    }
+
+    if (aCols[0] == PRIMARYKEY_TIMESTAMP_COL_ID) {
+      --nCols;
+      ++aCols;
+    }
+    code = tsdbDataFileReadBlockDataByColumn(state->pFileReader, pRecord, state->pBlockData, state->pTSchema, aCols,
+                                             nCols);
+    if (code != TSDB_CODE_SUCCESS) {
+      goto _err;
+    }
+
+    state->nRow = state->blockData.nRow;
+    state->iRow = state->nRow - 1;
+
+    state->state = SFSNEXTROW_BLOCKROW;
   }
-  /*
-  if (state->pDataFReader) {
-    tsdbDataFReaderClose(&state->pDataFReader);
-    state->pDataFReader = NULL;
+
+  if (SFSNEXTROW_BLOCKROW == state->state) {
+    if (state->iRow < 0) {
+      --state->iBrinRecord;
+      goto _next_brinrecord;
+    }
+
+    state->row = tsdbRowFromBlockData(state->pBlockData, state->iRow);
+    if (!state->pLastIter) {
+      *ppRow = &state->row;
+      --state->iRow;
+      return code;
+    }
+
+    if (!state->pLastRow) {
+      // get next row from fslast and process with fs row, --state->Row if select fs row
+      code = lastIterNext(&state->lastIter, &state->pLastRow, state->pTsdb, state->pTSchema, state->suid, state->uid,
+                          state->pr, state->lastTs, state->pFileSet, aCols, nCols);
+      if (code != TSDB_CODE_SUCCESS) {
+        goto _err;
+      }
+    }
+
+    if (!state->pLastRow) {
+      lastIterClose(&state->pLastIter);
+
+      *ppRow = &state->row;
+      --state->iRow;
+      return code;
+    }
+
+    // process state->pLastRow & state->row
+    TSKEY rowTs = TSDBROW_TS(&state->row);
+    TSKEY lastRowTs = TSDBROW_TS(state->pLastRow);
+    if (lastRowTs > rowTs) {
+      *ppRow = state->pLastRow;
+      state->pLastRow = NULL;
+      return code;
+    } else if (lastRowTs < rowTs) {
+      *ppRow = &state->row;
+      --state->iRow;
+      return code;
+    } else {
+      // TODO: merge rows and *ppRow = mergedRow
+    }
   }
-  */
-  if (state->pMergeTree != NULL) {
-    tMergeTreeClose(state->pMergeTree);
-    state->pMergeTree = NULL;
+
+_err:
+  // TODO: cleanup when error occurs
+  if (state->pLastIter) {
+    lastIterClose(&state->pLastIter);
   }
 
-  return code;
-}
+  if (state->pBlockData) {
+    tBlockDataDestroy(state->pBlockData);
+  }
 
-typedef enum SFSNEXTROWSTATES {
-  SFSNEXTROW_FS,
-  SFSNEXTROW_FILESET,
-  SFSNEXTROW_BLOCKDATA,
-  SFSNEXTROW_BLOCKROW
-} SFSNEXTROWSTATES;
+  *ppRow = NULL;
 
-typedef struct SFSNextRowIter {
-  SFSNEXTROWSTATES   state;         // [input]
-  STsdb             *pTsdb;         // [input]
-  SBlockIdx         *pBlockIdxExp;  // [input]
-  STSchema          *pTSchema;      // [input]
-  tb_uid_t           suid;
-  tb_uid_t           uid;
-  int32_t            nFileSet;
-  int32_t            iFileSet;
-  SArray            *aDFileSet;
-  SDataFReader     **pDataFReader;
-  SArray            *aBlockIdx;
-  LRUHandle         *aBlockIdxHandle;
-  SBlockIdx         *pBlockIdx;
-  SMapData           blockMap;
-  int32_t            nBlock;
-  int32_t            iBlock;
-  SDataBlk           block;
-  SBlockData         blockData;
-  SBlockData        *pBlockData;
-  int32_t            nRow;
-  int32_t            iRow;
-  TSDBROW            row;
-  SSttBlockLoadInfo *pLoadInfo;
-  int64_t            lastTs;
-} SFSNextRowIter;
+  return code;
+}
 
+#if 0
 static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow, bool *pIgnoreEarlierTs, bool isLast, int16_t *aCols,
                                 int nCols) {
   SFSNextRowIter *state = (SFSNextRowIter *)iter;
@@ -1917,17 +2044,16 @@ static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow, bool *pIgnoreEarlie
 
   switch (state->state) {
     case SFSNEXTROW_FS:
-      // state->aDFileSet = state->pTsdb->pFS->cState->aDFileSet;
-      state->nFileSet = taosArrayGetSize(state->aDFileSet);
+      state->nFileSet = TARRAY2_SIZE(state->aDFileSet);
       state->iFileSet = state->nFileSet;
 
       state->pBlockData = NULL;
 
     case SFSNEXTROW_FILESET: {
-      SDFileSet *pFileSet = NULL;
+      STFileSet *pFileSet = NULL;
     _next_fileset:
       if (--state->iFileSet >= 0) {
-        pFileSet = (SDFileSet *)taosArrayGet(state->aDFileSet, state->iFileSet);
+        pFileSet = TARRAY2_GET(state->aDFileSet, state->iFileSet);
       } else {
         // tBlockDataDestroy(&state->blockData, 1);
         if (state->pBlockData) {
@@ -2187,6 +2313,8 @@ _err:
   return code;
 }
 
+#endif
+
 int32_t clearNextRowFromFS(void *iter) {
   int32_t code = 0;
 
@@ -2365,24 +2493,23 @@ typedef struct {
   _next_row_clear_fn_t nextRowClearFn;
 } TsdbNextRowState;
 
-typedef struct {
+typedef struct CacheNextRowIter {
   SArray *pSkyline;
   int64_t iSkyline;
 
-  SBlockIdx          idx;
-  SMemNextRowIter    memState;
-  SMemNextRowIter    imemState;
-  SFSLastNextRowIter fsLastState;
-  SFSNextRowIter     fsState;
-  TSDBROW            memRow, imemRow, fsLastRow, fsRow;
+  SBlockIdx       idx;
+  SMemNextRowIter memState;
+  SMemNextRowIter imemState;
+  SFSNextRowIter  fsState;
+  TSDBROW         memRow, imemRow, fsLastRow, fsRow;
 
   TsdbNextRowState input[4];
   STsdb           *pTsdb;
 } CacheNextRowIter;
 
 static int32_t nextRowIterOpen(CacheNextRowIter *pIter, tb_uid_t uid, STsdb *pTsdb, STSchema *pTSchema, tb_uid_t suid,
-                               SSttBlockLoadInfo *pLoadInfo, SLDataIter *pLDataIter, STsdbReadSnap *pReadSnap,
-                               SDataFReader **pDataFReader, SDataFReader **pDataFReaderLast, int64_t lastTs) {
+                               SArray *pLDataIterArray, STsdbReadSnap *pReadSnap, SDataFReader **pDataFReader,
+                               SDataFReader **pDataFReaderLast, int64_t lastTs) {
   int code = 0;
 
   STbData *pMem = NULL;
@@ -2398,7 +2525,7 @@ static int32_t nextRowIterOpen(CacheNextRowIter *pIter, tb_uid_t uid, STsdb *pTs
   pIter->pTsdb = pTsdb;
 
   pIter->pSkyline = taosArrayInit(32, sizeof(TSDBKEY));
-
+#if 0
   SDelFile *pDelFile = pReadSnap->fs.pDelFile;
   if (pDelFile) {
     SDelFReader *pDelFReader;
@@ -2424,20 +2551,20 @@ static int32_t nextRowIterOpen(CacheNextRowIter *pIter, tb_uid_t uid, STsdb *pTs
       goto _err;
     }
 
-    taosArrayDestroy(pDelIdxArray);
+     taosArrayDestroy(pDelIdxArray);
     tsdbDelFReaderClose(&pDelFReader);
   } else {
     code = getTableDelSkyline(pMem, pIMem, NULL, NULL, pIter->pSkyline);
     if (code) goto _err;
   }
-
+#endif
   pIter->iSkyline = taosArrayGetSize(pIter->pSkyline) - 1;
 
   pIter->idx = (SBlockIdx){.suid = suid, .uid = uid};
-
+  /*
   pIter->fsLastState.state = (SFSLASTNEXTROWSTATES)SFSNEXTROW_FS;
   pIter->fsLastState.pTsdb = pTsdb;
-  pIter->fsLastState.aDFileSet = pReadSnap->fs.aDFileSet;
+  pIter->fsLastState.aDFileSet = pReadSnap->pfSetArray;
   pIter->fsLastState.pTSchema = pTSchema;
   pIter->fsLastState.suid = suid;
   pIter->fsLastState.uid = uid;
@@ -2445,22 +2572,24 @@ static int32_t nextRowIterOpen(CacheNextRowIter *pIter, tb_uid_t uid, STsdb *pTs
   pIter->fsLastState.pDataFReader = pDataFReaderLast;
   pIter->fsLastState.lastTs = lastTs;
   pIter->fsLastState.pDataIter = pLDataIter;
-
+  */
+  pIter->fsState.pRowIter = pIter;
   pIter->fsState.state = SFSNEXTROW_FS;
   pIter->fsState.pTsdb = pTsdb;
-  pIter->fsState.aDFileSet = pReadSnap->fs.aDFileSet;
+  pIter->fsState.aDFileSet = pReadSnap->pfSetArray;
   pIter->fsState.pBlockIdxExp = &pIter->idx;
   pIter->fsState.pTSchema = pTSchema;
   pIter->fsState.suid = suid;
   pIter->fsState.uid = uid;
-  pIter->fsState.pLoadInfo = pLoadInfo;
   pIter->fsState.pDataFReader = pDataFReader;
   pIter->fsState.lastTs = lastTs;
 
   pIter->input[0] = (TsdbNextRowState){&pIter->memRow, true, false, false, &pIter->memState, getNextRowFromMem, NULL};
   pIter->input[1] = (TsdbNextRowState){&pIter->imemRow, true, false, false, &pIter->imemState, getNextRowFromMem, NULL};
-  pIter->input[2] = (TsdbNextRowState){
+  /*
+pIter->input[2] = (TsdbNextRowState){
       &pIter->fsLastRow, false, true, false, &pIter->fsLastState, getNextRowFromFSLast, clearNextRowFromFSLast};
+  */
   pIter->input[3] =
       (TsdbNextRowState){&pIter->fsRow, false, true, false, &pIter->fsState, getNextRowFromFS, clearNextRowFromFS};
 
@@ -2632,321 +2761,6 @@ static int32_t updateTSchema(int32_t sversion, SCacheRowsReader *pReader, uint64
   return metaGetTbTSchemaEx(pReader->pTsdb->pVnode->pMeta, pReader->suid, uid, sversion, &pReader->pCurrSchema);
 }
 
-static int32_t mergeLastRow(tb_uid_t uid, STsdb *pTsdb, bool *dup, SArray **ppColArray, SCacheRowsReader *pr) {
-  STSchema *pTSchema = pr->pSchema;  // metaGetTbTSchema(pTsdb->pVnode->pMeta, uid, -1, 1);
-  int16_t   nLastCol = pTSchema->numOfCols;
-  int16_t   iCol = 0;
-  int16_t   noneCol = 0;
-  bool      setNoneCol = false;
-  bool      hasRow = false;
-  bool      ignoreEarlierTs = false;
-  SArray   *pColArray = NULL;
-  SColVal  *pColVal = &(SColVal){0};
-
-  int32_t code = initLastColArray(pTSchema, &pColArray);
-  if (TSDB_CODE_SUCCESS != code) {
-    return code;
-  }
-
-  TSKEY lastRowTs = TSKEY_MAX;
-
-  CacheNextRowIter iter = {0};
-  nextRowIterOpen(&iter, uid, pTsdb, pTSchema, pr->suid, pr->pLoadInfo, pr->pDataIter, pr->pReadSnap, &pr->pDataFReader,
-                  &pr->pDataFReaderLast, pr->lastTs);
-
-  do {
-    TSDBROW *pRow = NULL;
-    nextRowIterGet(&iter, &pRow, &ignoreEarlierTs, false, NULL, 0);
-
-    if (!pRow) {
-      break;
-    }
-
-    hasRow = true;
-
-    int32_t sversion = TSDBROW_SVERSION(pRow);
-    if (sversion != -1) {
-      code = updateTSchema(sversion, pr, uid);
-      if (TSDB_CODE_SUCCESS != code) {
-        goto _err;
-      }
-      pTSchema = pr->pCurrSchema;
-    }
-    int16_t nCol = pTSchema->numOfCols;
-
-    TSKEY rowTs = TSDBROW_TS(pRow);
-
-    if (lastRowTs == TSKEY_MAX) {
-      lastRowTs = rowTs;
-      STColumn *pTColumn = &pTSchema->columns[0];
-
-      *pColVal = COL_VAL_VALUE(pTColumn->colId, pTColumn->type, (SValue){.val = lastRowTs});
-      taosArraySet(pColArray, 0, &(SLastCol){.ts = lastRowTs, .colVal = *pColVal});
-
-      for (iCol = 1; iCol < nCol; ++iCol) {
-        if (iCol >= nLastCol) {
-          break;
-        }
-        SLastCol *pCol = taosArrayGet(pColArray, iCol);
-        if (pCol->colVal.cid != pTSchema->columns[iCol].colId) {
-          continue;
-        }
-        tsdbRowGetColVal(pRow, pTSchema, iCol, pColVal);
-
-        *pCol = (SLastCol){.ts = lastRowTs, .colVal = *pColVal};
-        if (IS_VAR_DATA_TYPE(pColVal->type) && pColVal->value.nData > 0) {
-          pCol->colVal.value.pData = taosMemoryMalloc(pCol->colVal.value.nData);
-          if (pCol->colVal.value.pData == NULL) {
-            terrno = TSDB_CODE_OUT_OF_MEMORY;
-            code = TSDB_CODE_OUT_OF_MEMORY;
-            goto _err;
-          }
-          memcpy(pCol->colVal.value.pData, pColVal->value.pData, pColVal->value.nData);
-        }
-
-        if (COL_VAL_IS_NONE(pColVal) && !setNoneCol) {
-          noneCol = iCol;
-          setNoneCol = true;
-        }
-      }
-      if (!setNoneCol) {
-        // done, goto return pColArray
-        break;
-      } else {
-        continue;
-      }
-    }
-
-    if ((rowTs < lastRowTs)) {
-      // done, goto return pColArray
-      break;
-    }
-
-    // merge into pColArray
-    setNoneCol = false;
-    for (iCol = noneCol; iCol < nCol; ++iCol) {
-      // high version's column value
-      SColVal *tColVal = (SColVal *)taosArrayGet(pColArray, iCol);
-
-      tsdbRowGetColVal(pRow, pTSchema, iCol, pColVal);
-      if (COL_VAL_IS_NONE(tColVal) && !COL_VAL_IS_NONE(pColVal)) {
-        SLastCol lastCol = {.ts = rowTs, .colVal = *pColVal};
-        if (IS_VAR_DATA_TYPE(pColVal->type) && pColVal->value.nData > 0) {
-          SLastCol *pLastCol = (SLastCol *)taosArrayGet(pColArray, iCol);
-          taosMemoryFree(pLastCol->colVal.value.pData);
-
-          lastCol.colVal.value.pData = taosMemoryMalloc(lastCol.colVal.value.nData);
-          if (lastCol.colVal.value.pData == NULL) {
-            terrno = TSDB_CODE_OUT_OF_MEMORY;
-            code = TSDB_CODE_OUT_OF_MEMORY;
-            goto _err;
-          }
-          memcpy(lastCol.colVal.value.pData, pColVal->value.pData, pColVal->value.nData);
-        }
-
-        taosArraySet(pColArray, iCol, &lastCol);
-      } else if (COL_VAL_IS_NONE(tColVal) && COL_VAL_IS_NONE(pColVal) && !setNoneCol) {
-        noneCol = iCol;
-        setNoneCol = true;
-      }
-    }
-  } while (setNoneCol);
-
-  // build the result ts row here
-  *dup = false;
-  // if (taosArrayGetSize(pColArray) != nCol) {
-  //*ppColArray = NULL;
-  // taosArrayDestroy(pColArray);
-  //} else {
-  if (!hasRow) {
-    if (ignoreEarlierTs) {
-      taosArrayDestroy(pColArray);
-      pColArray = NULL;
-    } else {
-      taosArrayClear(pColArray);
-    }
-  }
-  *ppColArray = pColArray;
-  //}
-
-  nextRowIterClose(&iter);
-  // taosMemoryFreeClear(pTSchema);
-  return code;
-
-_err:
-  nextRowIterClose(&iter);
-  taosArrayDestroy(pColArray);
-  // taosMemoryFreeClear(pTSchema);
-  return code;
-}
-
-static int32_t mergeLast(tb_uid_t uid, STsdb *pTsdb, SArray **ppLastArray, SCacheRowsReader *pr) {
-  STSchema *pTSchema = pr->pSchema;  // metaGetTbTSchema(pTsdb->pVnode->pMeta, uid, -1, 1);
-  int16_t   nLastCol = pTSchema->numOfCols;
-  int16_t   noneCol = 0;
-  bool      setNoneCol = false;
-  bool      hasRow = false;
-  bool      ignoreEarlierTs = false;
-  SArray   *pColArray = NULL;
-  SColVal  *pColVal = &(SColVal){0};
-  int16_t   nCols = nLastCol;
-
-  int32_t code = initLastColArray(pTSchema, &pColArray);
-  if (TSDB_CODE_SUCCESS != code) {
-    return code;
-  }
-  SArray *aColArray = taosArrayInit(nCols, sizeof(int16_t));
-  if (NULL == aColArray) {
-    taosArrayDestroy(pColArray);
-
-    return TSDB_CODE_OUT_OF_MEMORY;
-  }
-  for (int i = 1; i < pTSchema->numOfCols; ++i) {
-    taosArrayPush(aColArray, &pTSchema->columns[i].colId);
-  }
-
-  TSKEY lastRowTs = TSKEY_MAX;
-
-  CacheNextRowIter iter = {0};
-  nextRowIterOpen(&iter, uid, pTsdb, pTSchema, pr->suid, pr->pLoadInfo, pr->pDataIter, pr->pReadSnap, &pr->pDataFReader,
-                  &pr->pDataFReaderLast, pr->lastTs);
-
-  do {
-    TSDBROW *pRow = NULL;
-    nextRowIterGet(&iter, &pRow, &ignoreEarlierTs, true, TARRAY_DATA(aColArray), TARRAY_SIZE(aColArray));
-
-    if (!pRow) {
-      break;
-    }
-
-    hasRow = true;
-
-    int32_t sversion = TSDBROW_SVERSION(pRow);
-    if (sversion != -1) {
-      code = updateTSchema(sversion, pr, uid);
-      if (TSDB_CODE_SUCCESS != code) {
-        goto _err;
-      }
-      pTSchema = pr->pCurrSchema;
-    }
-    int16_t nCol = pTSchema->numOfCols;
-
-    TSKEY rowTs = TSDBROW_TS(pRow);
-
-    if (lastRowTs == TSKEY_MAX) {
-      lastRowTs = rowTs;
-      STColumn *pTColumn = &pTSchema->columns[0];
-
-      *pColVal = COL_VAL_VALUE(pTColumn->colId, pTColumn->type, (SValue){.val = lastRowTs});
-      taosArraySet(pColArray, 0, &(SLastCol){.ts = lastRowTs, .colVal = *pColVal});
-
-      for (int16_t iCol = 1; iCol < nCol; ++iCol) {
-        if (iCol >= nLastCol) {
-          break;
-        }
-        SLastCol *pCol = taosArrayGet(pColArray, iCol);
-        if (pCol->colVal.cid != pTSchema->columns[iCol].colId) {
-          continue;
-        }
-        tsdbRowGetColVal(pRow, pTSchema, iCol, pColVal);
-
-        *pCol = (SLastCol){.ts = lastRowTs, .colVal = *pColVal};
-        if (IS_VAR_DATA_TYPE(pColVal->type) && pColVal->value.nData > 0) {
-          pCol->colVal.value.pData = taosMemoryMalloc(pCol->colVal.value.nData);
-          if (pCol->colVal.value.pData == NULL) {
-            terrno = TSDB_CODE_OUT_OF_MEMORY;
-            code = TSDB_CODE_OUT_OF_MEMORY;
-            goto _err;
-          }
-          memcpy(pCol->colVal.value.pData, pColVal->value.pData, pColVal->value.nData);
-        }
-
-        if (!COL_VAL_IS_VALUE(pColVal)) {
-          if (!setNoneCol) {
-            noneCol = iCol;
-            setNoneCol = true;
-          }
-        } else {
-          int32_t aColIndex = taosArraySearchIdx(aColArray, &pColVal->cid, compareInt16Val, TD_EQ);
-          taosArrayRemove(aColArray, aColIndex);
-        }
-      }
-      if (!setNoneCol) {
-        // done, goto return pColArray
-        break;
-      } else {
-        continue;
-      }
-    }
-
-    // merge into pColArray
-    setNoneCol = false;
-    for (int16_t iCol = noneCol; iCol < nCol; ++iCol) {
-      if (iCol >= nLastCol) {
-        break;
-      }
-      // high version's column value
-      SLastCol *lastColVal = (SLastCol *)taosArrayGet(pColArray, iCol);
-      if (lastColVal->colVal.cid != pTSchema->columns[iCol].colId) {
-        continue;
-      }
-      SColVal *tColVal = &lastColVal->colVal;
-
-      tsdbRowGetColVal(pRow, pTSchema, iCol, pColVal);
-      if (!COL_VAL_IS_VALUE(tColVal) && COL_VAL_IS_VALUE(pColVal)) {
-        SLastCol lastCol = {.ts = rowTs, .colVal = *pColVal};
-        if (IS_VAR_DATA_TYPE(pColVal->type) && pColVal->value.nData > 0) {
-          SLastCol *pLastCol = (SLastCol *)taosArrayGet(pColArray, iCol);
-          taosMemoryFree(pLastCol->colVal.value.pData);
-
-          lastCol.colVal.value.pData = taosMemoryMalloc(lastCol.colVal.value.nData);
-          if (lastCol.colVal.value.pData == NULL) {
-            terrno = TSDB_CODE_OUT_OF_MEMORY;
-            code = TSDB_CODE_OUT_OF_MEMORY;
-            goto _err;
-          }
-          memcpy(lastCol.colVal.value.pData, pColVal->value.pData, pColVal->value.nData);
-        }
-
-        taosArraySet(pColArray, iCol, &lastCol);
-        int32_t aColIndex = taosArraySearchIdx(aColArray, &lastCol.colVal.cid, compareInt16Val, TD_EQ);
-        taosArrayRemove(aColArray, aColIndex);
-      } else if (!COL_VAL_IS_VALUE(tColVal) && !COL_VAL_IS_VALUE(pColVal) && !setNoneCol) {
-        noneCol = iCol;
-        setNoneCol = true;
-      }
-    }
-  } while (setNoneCol);
-
-  // if (taosArrayGetSize(pColArray) <= 0) {
-  //*ppLastArray = NULL;
-  // taosArrayDestroy(pColArray);
-  //} else {
-  if (!hasRow) {
-    if (ignoreEarlierTs) {
-      taosArrayDestroy(pColArray);
-      pColArray = NULL;
-    } else {
-      taosArrayClear(pColArray);
-    }
-  }
-  *ppLastArray = pColArray;
-  //}
-
-  nextRowIterClose(&iter);
-  taosArrayDestroy(aColArray);
-  // taosMemoryFreeClear(pTSchema);
-  return code;
-
-_err:
-  nextRowIterClose(&iter);
-  // taosMemoryFreeClear(pTSchema);
-  *ppLastArray = NULL;
-  taosArrayDestroy(pColArray);
-  taosArrayDestroy(aColArray);
-  return code;
-}
-
 static int32_t mergeLastCid(tb_uid_t uid, STsdb *pTsdb, SArray **ppLastArray, SCacheRowsReader *pr, int16_t *aCols,
                             int nCols, int16_t *slotIds) {
   STSchema *pTSchema = pr->pSchema;  // metaGetTbTSchema(pTsdb->pVnode->pMeta, uid, -1, 1);
@@ -2976,7 +2790,7 @@ static int32_t mergeLastCid(tb_uid_t uid, STsdb *pTsdb, SArray **ppLastArray, SC
   TSKEY lastRowTs = TSKEY_MAX;
 
   CacheNextRowIter iter = {0};
-  nextRowIterOpen(&iter, uid, pTsdb, pTSchema, pr->suid, pr->pLoadInfo, pr->pDataIter, pr->pReadSnap, &pr->pDataFReader,
+  nextRowIterOpen(&iter, uid, pTsdb, pTSchema, pr->suid, pr->pLDataIterArray, pr->pReadSnap, &pr->pDataFReader,
                   &pr->pDataFReaderLast, pr->lastTs);
 
   do {
@@ -3146,7 +2960,7 @@ static int32_t mergeLastRowCid(tb_uid_t uid, STsdb *pTsdb, SArray **ppLastArray,
   TSKEY lastRowTs = TSKEY_MAX;
 
   CacheNextRowIter iter = {0};
-  nextRowIterOpen(&iter, uid, pTsdb, pTSchema, pr->suid, pr->pLoadInfo, pr->pDataIter, pr->pReadSnap, &pr->pDataFReader,
+  nextRowIterOpen(&iter, uid, pTsdb, pTSchema, pr->suid, pr->pLDataIterArray, pr->pReadSnap, &pr->pDataFReader,
                   &pr->pDataFReaderLast, pr->lastTs);
 
   do {
@@ -3236,92 +3050,6 @@ _err:
   return code;
 }
 
-int32_t tsdbCacheGetLastrowH(SLRUCache *pCache, tb_uid_t uid, SCacheRowsReader *pr, LRUHandle **handle) {
-  int32_t code = 0;
-  char    key[32] = {0};
-  int     keyLen = 0;
-
-  //  getTableCacheKeyS(uid, "lr", key, &keyLen);
-  getTableCacheKey(uid, 0, key, &keyLen);
-  LRUHandle *h = taosLRUCacheLookup(pCache, key, keyLen);
-  if (!h) {
-    STsdb *pTsdb = pr->pVnode->pTsdb;
-    taosThreadMutexLock(&pTsdb->lruMutex);
-
-    h = taosLRUCacheLookup(pCache, key, keyLen);
-    if (!h) {
-      SArray *pArray = NULL;
-      bool    dup = false;  // which is always false for now
-      code = mergeLastRow(uid, pTsdb, &dup, &pArray, pr);
-      // if table's empty or error or ignore ignore earlier ts, set handle NULL and return
-      if (code < 0 || pArray == NULL) {
-        if (!dup && pArray) {
-          taosArrayDestroy(pArray);
-        }
-
-        taosThreadMutexUnlock(&pTsdb->lruMutex);
-
-        *handle = NULL;
-
-        return 0;
-      }
-
-      size_t              charge = pArray->capacity * pArray->elemSize + sizeof(*pArray);
-      _taos_lru_deleter_t deleter = deleteTableCacheLast;
-      LRUStatus           status =
-          taosLRUCacheInsert(pCache, key, keyLen, pArray, charge, deleter, &h, TAOS_LRU_PRIORITY_LOW, NULL);
-      if (status != TAOS_LRU_STATUS_OK) {
-        code = -1;
-      }
-    }
-    taosThreadMutexUnlock(&pTsdb->lruMutex);
-  }
-
-  *handle = h;
-
-  return code;
-}
-
-int32_t tsdbCacheGetLastH(SLRUCache *pCache, tb_uid_t uid, SCacheRowsReader *pr, LRUHandle **handle) {
-  int32_t code = 0;
-  char    key[32] = {0};
-  int     keyLen = 0;
-
-  // getTableCacheKeyS(uid, "l", key, &keyLen);
-  getTableCacheKey(uid, 1, key, &keyLen);
-  LRUHandle *h = taosLRUCacheLookup(pCache, key, keyLen);
-  if (!h) {
-    STsdb *pTsdb = pr->pVnode->pTsdb;
-    taosThreadMutexLock(&pTsdb->lruMutex);
-
-    h = taosLRUCacheLookup(pCache, key, keyLen);
-    if (!h) {
-      SArray *pLastArray = NULL;
-      code = mergeLast(uid, pTsdb, &pLastArray, pr);
-      // if table's empty or error or ignore ignore earlier ts, set handle NULL and return
-      if (code < 0 || pLastArray == NULL) {
-        taosThreadMutexUnlock(&pTsdb->lruMutex);
-
-        *handle = NULL;
-        return 0;
-      }
-
-      size_t              charge = pLastArray->capacity * pLastArray->elemSize + sizeof(*pLastArray);
-      _taos_lru_deleter_t deleter = deleteTableCacheLast;
-      LRUStatus           status =
-          taosLRUCacheInsert(pCache, key, keyLen, pLastArray, charge, deleter, &h, TAOS_LRU_PRIORITY_LOW, NULL);
-      if (status != TAOS_LRU_STATUS_OK) {
-        code = -1;
-      }
-    }
-    taosThreadMutexUnlock(&pTsdb->lruMutex);
-  }
-
-  *handle = h;
-
-  return code;
-}
-
 int32_t tsdbCacheRelease(SLRUCache *pCache, LRUHandle *h) {
   int32_t code = 0;
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbCacheRead.c b/source/dnode/vnode/src/tsdb/tsdbCacheRead.c
index 6138b1f7b40184be649a78543d8958fbfe80516f..3491c504d1a69205c90f78d6a56970d6da307d2a 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCacheRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCacheRead.c
@@ -124,7 +124,10 @@ int32_t tsdbReuseCacherowsReader(void* reader, void* pTableIdList, int32_t numOf
   pReader->numOfTables = numOfTables;
   pReader->lastTs = INT64_MIN;
 
-  resetLastBlockLoadInfo(pReader->pLoadInfo);
+  int64_t blocks;
+  double  elapse;
+  pReader->pLDataIterArray = destroySttBlockReader(pReader->pLDataIterArray, &blocks, &elapse);
+  pReader->pLDataIterArray = taosArrayInit(4, POINTER_BYTES);
 
   return TSDB_CODE_SUCCESS;
 }
@@ -178,14 +181,8 @@ int32_t tsdbCacherowsReaderOpen(void* pVnode, int32_t type, void* pTableIdList,
 
   SVnodeCfg* pCfg = &((SVnode*)pVnode)->config;
   int32_t    numOfStt = pCfg->sttTrigger;
-  p->pLoadInfo = tCreateLastBlockLoadInfo(p->pSchema, NULL, 0, numOfStt);
-  if (p->pLoadInfo == NULL) {
-    tsdbCacherowsReaderClose(p);
-    return TSDB_CODE_OUT_OF_MEMORY;
-  }
-
-  p->pDataIter = taosMemoryCalloc(pCfg->sttTrigger, sizeof(SLDataIter));
-  if (p->pDataIter == NULL) {
+  p->pLDataIterArray = taosArrayInit(4, POINTER_BYTES);
+  if (p->pLDataIterArray == NULL) {
     tsdbCacherowsReaderClose(p);
     return TSDB_CODE_OUT_OF_MEMORY;
   }
@@ -214,10 +211,11 @@ void* tsdbCacherowsReaderClose(void* pReader) {
     taosMemoryFree(p->pSchema);
   }
 
-  taosMemoryFree(p->pDataIter);
   taosMemoryFree(p->pCurrSchema);
 
-  destroyLastBlockLoadInfo(p->pLoadInfo);
+  int64_t loadBlocks = 0;
+  double  elapse = 0;
+  destroySttBlockReader(p->pLDataIterArray, &loadBlocks, &elapse);
 
   taosMemoryFree((void*)p->idstr);
   taosThreadMutexDestroy(&p->readerMutex);
@@ -298,7 +296,7 @@ int32_t tsdbRetrieveCacheRows(void* pReader, SSDataBlock* pResBlock, const int32
   }
 
   taosThreadMutexLock(&pr->readerMutex);
-  code = tsdbTakeReadSnap((STsdbReader*)pr, tsdbCacheQueryReseek, &pr->pReadSnap);
+  code = tsdbTakeReadSnap2((STsdbReader*)pr, tsdbCacheQueryReseek, &pr->pReadSnap);
   if (code != TSDB_CODE_SUCCESS) {
     goto _end;
   }
@@ -427,8 +425,12 @@ _end:
   tsdbDataFReaderClose(&pr->pDataFReaderLast);
   tsdbDataFReaderClose(&pr->pDataFReader);
 
-  resetLastBlockLoadInfo(pr->pLoadInfo);
-  tsdbUntakeReadSnap((STsdbReader*)pr, pr->pReadSnap, true);
+  int64_t loadBlocks = 0;
+  double  elapse = 0;
+  pr->pLDataIterArray = destroySttBlockReader(pr->pLDataIterArray, &loadBlocks, &elapse);
+  pr->pLDataIterArray = taosArrayInit(4, POINTER_BYTES);
+
+  tsdbUntakeReadSnap2((STsdbReader*)pr, pr->pReadSnap, true);
   taosThreadMutexUnlock(&pr->readerMutex);
 
   if (pRes != NULL) {
diff --git a/source/dnode/vnode/src/tsdb/tsdbFS2.h b/source/dnode/vnode/src/tsdb/tsdbFS2.h
index e740d5b735146c91f4fa4ff6c68d67dc9a6bb8f4..8270581e58e23468fb1f6e782fc1015c27b2e71c 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFS2.h
+++ b/source/dnode/vnode/src/tsdb/tsdbFS2.h
@@ -25,7 +25,7 @@ extern "C" {
 /* Exposed Handle */
 typedef struct STFileSystem STFileSystem;
 typedef struct STFSBgTask   STFSBgTask;
-typedef TARRAY2(STFileSet *) TFileSetArray;
+// typedef TARRAY2(STFileSet *) TFileSetArray;
 
 typedef enum {
   TSDB_FEDIT_COMMIT = 1,  //
@@ -107,4 +107,4 @@ struct STFileSystem {
 }
 #endif
 
-#endif /*_TSDB_FILE_SYSTEM_H*/
\ No newline at end of file
+#endif /*_TSDB_FILE_SYSTEM_H*/
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead2.c b/source/dnode/vnode/src/tsdb/tsdbRead2.c
index f753bf34ebc449e76ed6ad39605a1395a3969ad9..e8abaa4e3343930c449d7eaa7d80c8fd4c4121e3 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead2.c
@@ -18,9 +18,9 @@
 #include "tsdbDataFileRW.h"
 #include "tsdbFS2.h"
 #include "tsdbMerge.h"
+#include "tsdbReadUtil.h"
 #include "tsdbUtil2.h"
 #include "tsimplehash.h"
-#include "tsdbReadUtil.h"
 
 #define ASCENDING_TRAVERSE(o)        (o == TSDB_ORDER_ASC)
 #define getCurrentKeyInLastBlock(_r) ((_r)->currentKey)
@@ -100,7 +100,7 @@ static int32_t updateBlockSMAInfo(STSchema* pSchema, SBlockLoadSuppInfo* pSupInf
 
       i += 1;
       j += 1;
-    } else if (pTCol->colId < pSupInfo->colId[j]) { // do nothing
+    } else if (pTCol->colId < pSupInfo->colId[j]) {  // do nothing
       i += 1;
     } else {
       return TSDB_CODE_INVALID_PARA;
@@ -3815,7 +3815,7 @@ static int32_t doOpenReaderImpl(STsdbReader* pReader) {
   SReaderStatus*  pStatus = &pReader->status;
   SDataBlockIter* pBlockIter = &pStatus->blockIter;
 
-  initFilesetIterator(&pStatus->fileIter, pReader->status.pfSetArray, pReader);
+  initFilesetIterator(&pStatus->fileIter, pReader->pReadSnap->pfSetArray, pReader);
   resetDataBlockIterator(&pStatus->blockIter, pReader->info.order);
 
   int32_t code = TSDB_CODE_SUCCESS;
@@ -3842,7 +3842,6 @@ static void freeSchemaFunc(void* param) {
 static void clearSharedPtr(STsdbReader* p) {
   p->status.pTableMap = NULL;
   p->status.uidList.tableUidList = NULL;
-  p->status.pfSetArray = NULL;
   p->info.pSchema = NULL;
   p->pReadSnap = NULL;
   p->pSchemaMap = NULL;
@@ -3851,7 +3850,8 @@ static void clearSharedPtr(STsdbReader* p) {
 static void setSharedPtr(STsdbReader* pDst, const STsdbReader* pSrc) {
   pDst->status.pTableMap = pSrc->status.pTableMap;
   pDst->status.uidList = pSrc->status.uidList;
-  pDst->status.pfSetArray = pSrc->status.pfSetArray;
+  // pDst->status.pfSetArray = pSrc->status.pfSetArray;
+  pDst->pReadSnap->pfSetArray = pSrc->pReadSnap->pfSetArray;
   pDst->info.pSchema = pSrc->info.pSchema;
   pDst->pSchemaMap = pSrc->pSchemaMap;
   pDst->pReadSnap = pSrc->pReadSnap;
@@ -4633,7 +4633,7 @@ int32_t tsdbReaderReset2(STsdbReader* pReader, SQueryTableDataCond* pCond) {
 
   int32_t numOfTables = tSimpleHashGetSize(pStatus->pTableMap);
 
-  initFilesetIterator(&pStatus->fileIter, pReader->status.pfSetArray, pReader);
+  initFilesetIterator(&pStatus->fileIter, pReader->pReadSnap->pfSetArray, pReader);
   resetDataBlockIterator(pBlockIter, pReader->info.order);
   resetTableListIndex(&pReader->status);
 
@@ -4886,7 +4886,7 @@ int32_t tsdbTakeReadSnap2(STsdbReader* pReader, _query_reseek_func_t reseek, STs
   }
 
   // fs
-  code = tsdbFSCreateRefSnapshot(pTsdb->pFS, &pReader->status.pfSetArray);
+  code = tsdbFSCreateRefSnapshot(pTsdb->pFS, &pSnap->pfSetArray);
   if (code) {
     taosThreadRwlockUnlock(&pTsdb->rwLock);
     goto _exit;
@@ -4929,7 +4929,7 @@ void tsdbUntakeReadSnap2(STsdbReader* pReader, STsdbReadSnap* pSnap, bool proact
     if (pSnap->pINode) taosMemoryFree(pSnap->pINode);
     taosMemoryFree(pSnap);
 
-    tsdbFSDestroyRefSnapshot(&pReader->status.pfSetArray);
+    tsdbFSDestroyRefSnapshot(&pSnap->pfSetArray);
   }
   tsdbTrace("vgId:%d, untake read snapshot", TD_VID(pTsdb->pVnode));
 }
diff --git a/source/dnode/vnode/src/tsdb/tsdbReadUtil.h b/source/dnode/vnode/src/tsdb/tsdbReadUtil.h
index 9a0b540487434d989e8d1bb13c4da38e7d9ed46d..bb0cf5fbce732e993f70fb4b0307178c03984a90 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReadUtil.h
+++ b/source/dnode/vnode/src/tsdb/tsdbReadUtil.h
@@ -20,8 +20,8 @@
 extern "C" {
 #endif
 
-#include "tsdbUtil2.h"
 #include "tsdbDataFileRW.h"
+#include "tsdbUtil2.h"
 
 #define ASCENDING_TRAVERSE(o) (o == TSDB_ORDER_ASC)
 
@@ -196,7 +196,6 @@ typedef struct SReaderStatus {
   SArray*               pLDataIterArray;
   SRowMerger            merger;
   SColumnInfoData*      pPrimaryTsCol;  // primary time stamp output col info data
-  TFileSetArray*        pfSetArray;
 } SReaderStatus;
 
 struct STsdbReader {