diff --git a/include/libs/executor/storageapi.h b/include/libs/executor/storageapi.h
index 1d40274504..32b60b55ae 100644
--- a/include/libs/executor/storageapi.h
+++ b/include/libs/executor/storageapi.h
@@ -152,6 +152,18 @@ typedef struct {
 
 // clang-format off
 /*-------------------------------------------------new api format---------------------------------------------------*/
+typedef enum {
+  TSD_READER_NOTIFY_DURATION_START
+} ETsdReaderNotifyType;
+
+typedef union {
+  struct {
+    int32_t filesetId;
+  } duration;
+} STsdReaderNotifyInfo;
+
+typedef void (*TsdReaderNotifyCbFn)(ETsdReaderNotifyType type, STsdReaderNotifyInfo* info, void* param);
+
 typedef struct TsdReader {
   int32_t      (*tsdReaderOpen)(void* pVnode, SQueryTableDataCond* pCond, void* pTableList, int32_t numOfTables,
                            SSDataBlock* pResBlock, void** ppReader, const char* idstr, bool countOnly,
@@ -170,6 +182,9 @@ typedef struct TsdReader {
   int32_t      (*tsdReaderGetDataBlockDistInfo)();
   int64_t      (*tsdReaderGetNumOfInMemRows)();
   void         (*tsdReaderNotifyClosing)();
+
+  void         (*tsdSetFilesetDelimited)(void* pReader);
+  void         (*tsdSetSetNotifyCb)(void* pReader, TsdReaderNotifyCbFn notifyFn, void* param);
 } TsdReader;
 
 typedef struct SStoreCacheReader {
diff --git a/include/libs/nodes/plannodes.h b/include/libs/nodes/plannodes.h
index e29750d8a0..b99a97a194 100644
--- a/include/libs/nodes/plannodes.h
+++ b/include/libs/nodes/plannodes.h
@@ -118,6 +118,7 @@ typedef struct SScanLogicNode {
   bool          igLastNull;
   bool          groupOrderScan;
   bool          onlyMetaCtbIdx; // for tag scan with no tbname
+  bool          filesetDelimited; // returned blocks delimited by fileset
 } SScanLogicNode;
 
 typedef struct SJoinLogicNode {
@@ -432,6 +433,7 @@ typedef struct STableScanPhysiNode {
   int8_t         igExpired;
   bool           assignBlockUid;
   int8_t         igCheckUpdate;
+  bool           filesetDelimited;
 } STableScanPhysiNode;
 
 typedef STableScanPhysiNode STableSeqScanPhysiNode;
diff --git a/source/dnode/vnode/inc/vnode.h b/source/dnode/vnode/inc/vnode.h
index 74e4b66098..74d62da5c5 100644
--- a/source/dnode/vnode/inc/vnode.h
+++ b/source/dnode/vnode/inc/vnode.h
@@ -170,7 +170,9 @@ void        *tsdbGetIdx2(SMeta *pMeta);
 void        *tsdbGetIvtIdx2(SMeta *pMeta);
 uint64_t     tsdbGetReaderMaxVersion2(STsdbReader *pReader);
 void         tsdbReaderSetCloseFlag(STsdbReader *pReader);
-//======================================================================================================================
+int64_t      tsdbGetLastTimestamp2(SVnode *pVnode, void *pTableList, int32_t numOfTables, const char *pIdStr);
+void         tsdbSetFilesetDelimited(STsdbReader* pReader);
+void         tsdbReaderSetNotifyCb(STsdbReader* pReader, TsdReaderNotifyCbFn notifyFn, void* param);
 
 int32_t tsdbReuseCacherowsReader(void *pReader, void *pTableIdList, int32_t numOfTables);
 int32_t tsdbCacherowsReaderOpen(void *pVnode, int32_t type, void *pTableIdList, int32_t numOfTables, int32_t numOfCols,
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead2.c b/source/dnode/vnode/src/tsdb/tsdbRead2.c
index 0753c2454d..6bb5b51a30 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead2.c
@@ -60,6 +60,8 @@ static bool          hasDataInFileBlock(const SBlockData* pBlockData, const SFil
 static bool          hasDataInSttBlock(SSttBlockReader* pSttBlockReader);
 static void          initBlockDumpInfo(STsdbReader* pReader, SDataBlockIter* pBlockIter);
 static int32_t       getInitialDelIndex(const SArray* pDelSkyline, int32_t order);
+static void          resetTableListIndex(SReaderStatus* pStatus);
+static void          getMemTableTimeRange(STsdbReader* pReader, int64_t* pMaxKey, int64_t* pMinKey);
 static void          updateComposedBlockInfo(STsdbReader* pReader, double el, STableBlockScanInfo* pBlockScanInfo);
 
 static bool outOfTimeWindow(int64_t ts, STimeWindow* pWindow) { return (ts > pWindow->ekey) || (ts < pWindow->skey); }
@@ -244,6 +246,7 @@ static int32_t filesetIteratorNext(SFilesetIter* pIter, STsdbReader* pReader, bo
 
     tsdbDebug("%p file found fid:%d for qrange:%" PRId64 "-%" PRId64 ", %s", pReader, fid, pReader->info.window.skey,
               pReader->info.window.ekey, pReader->idStr);
+
     *hasNext = true;
     return TSDB_CODE_SUCCESS;
   }
@@ -422,6 +425,8 @@ static int32_t tsdbReaderCreate(SVnode* pVnode, SQueryTableDataCond* pCond, void
     goto _end;
   }
 
+  pReader->bFilesetDelimited = false;
+
   tsdbInitReaderLock(pReader);
   tsem_init(&pReader->resumeAfterSuspend, 0, 0);
 
@@ -2556,6 +2561,41 @@ TSDBKEY getCurrentKeyInBuf(STableBlockScanInfo* pScanInfo, STsdbReader* pReader)
   }
 }
 
+static void prepareDurationForNextFileSet(STsdbReader* pReader) {
+  if (pReader->status.bProcMemFirstFileset) {
+    pReader->status.prevFilesetStartKey = INT64_MIN;
+    pReader->status.prevFilesetEndKey = INT64_MAX;
+    pReader->status.bProcMemFirstFileset = false;
+  }
+
+  int32_t fid = pReader->status.pCurrentFileset->fid;
+  STimeWindow winFid = {0};
+  tsdbFidKeyRange(fid, pReader->pTsdb->keepCfg.days, pReader->pTsdb->keepCfg.precision, &winFid.skey, &winFid.ekey);
+
+  if (ASCENDING_TRAVERSE(pReader->info.order)) {
+    pReader->status.bProcMemPreFileset = !(pReader->status.memTableMaxKey < pReader->status.prevFilesetStartKey || 
+                                            (winFid.skey-1) < pReader->status.memTableMinKey);
+  } else {
+    pReader->status.bProcMemPreFileset = !( pReader->status.memTableMaxKey < (winFid.ekey+1) || 
+                                            pReader->status.prevFilesetEndKey < pReader->status.memTableMinKey);
+  }
+  
+  if (pReader->status.bProcMemPreFileset) {
+    resetTableListIndex(&pReader->status);
+  }
+
+  if (!pReader->status.bProcMemPreFileset) {
+    if (pReader->notifyFn) {
+      STsdReaderNotifyInfo info = {0};
+      info.duration.filesetId = fid;
+      pReader->notifyFn(TSD_READER_NOTIFY_DURATION_START, &info, pReader->notifyParam);
+    }    
+  }
+  
+  pReader->status.prevFilesetStartKey = winFid.skey;
+  pReader->status.prevFilesetEndKey = winFid.ekey;
+}
+
 static int32_t moveToNextFile(STsdbReader* pReader, SBlockNumber* pBlockNum, SArray* pTableList) {
   SReaderStatus* pStatus = &pReader->status;
   pBlockNum->numOfBlocks = 0;
@@ -2597,6 +2637,9 @@ static int32_t moveToNextFile(STsdbReader* pReader, SBlockNumber* pBlockNum, SAr
       }
 
       if (pBlockNum->numOfBlocks + pBlockNum->numOfSttFiles > 0) {
+        if (pReader->bFilesetDelimited) {
+          prepareDurationForNextFileSet(pReader);
+        }
         break;
       }
     }
@@ -2978,7 +3021,7 @@ static int32_t readRowsCountFromMem(STsdbReader* pReader) {
   return code;
 }
 
-static int32_t buildBlockFromBufferSequentially(STsdbReader* pReader) {
+static int32_t buildBlockFromBufferSequentially(STsdbReader* pReader, int64_t endKey) {
   SReaderStatus* pStatus = &pReader->status;
   STableUidList* pUidList = &pStatus->uidList;
 
@@ -2997,13 +3040,12 @@ static int32_t buildBlockFromBufferSequentially(STsdbReader* pReader) {
       if (!hasNexTable) {
         return TSDB_CODE_SUCCESS;
       }
-      pBlockScanInfo = pStatus->pTableIter;
+      continue;
     }
 
     initMemDataIterator(*pBlockScanInfo, pReader);
     initDelSkylineIterator(*pBlockScanInfo, pReader->info.order, &pReader->cost);
 
-    int64_t endKey = (ASCENDING_TRAVERSE(pReader->info.order)) ? INT64_MAX : INT64_MIN;
     int32_t code = buildDataBlockFromBuf(pReader, *pBlockScanInfo, endKey);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
@@ -3940,6 +3982,11 @@ static int32_t doOpenReaderImpl(STsdbReader* pReader) {
   SReaderStatus*  pStatus = &pReader->status;
   SDataBlockIter* pBlockIter = &pStatus->blockIter;
 
+  if (pReader->bFilesetDelimited) {
+    getMemTableTimeRange(pReader, &pReader->status.memTableMaxKey, &pReader->status.memTableMinKey);
+    pReader->status.bProcMemFirstFileset = true;
+  }
+  
   initFilesetIterator(&pStatus->fileIter, pReader->pReadSnap->pfSetArray, pReader);
   resetDataBlockIterator(&pStatus->blockIter, pReader->info.order);
 
@@ -4247,6 +4294,10 @@ int32_t tsdbReaderSuspend2(STsdbReader* pReader) {
 
   tsdbUntakeReadSnap2(pReader, pReader->pReadSnap, false);
   pReader->pReadSnap = NULL;
+  if (pReader->bFilesetDelimited) {
+    pReader->status.memTableMinKey = INT64_MAX;
+    pReader->status.memTableMaxKey = INT64_MIN;
+  }
   pReader->flag = READER_STATUS_SUSPEND;
 
 #if SUSPEND_RESUME_TEST
@@ -4358,6 +4409,72 @@ static bool tsdbReadRowsCountOnly(STsdbReader* pReader) {
   return pBlock->info.rows > 0;
 }
 
+static int32_t doTsdbNextDataBlockFilesetDelimited(STsdbReader* pReader) {
+  SReaderStatus* pStatus = &pReader->status;
+  int32_t code = TSDB_CODE_SUCCESS;
+  SSDataBlock* pBlock = pReader->resBlockInfo.pResBlock;
+
+  if (pStatus->loadFromFile) {
+    if (pStatus->bProcMemPreFileset) {
+      int32_t fid = pReader->status.pCurrentFileset->fid;
+      STimeWindow win = {0};
+      tsdbFidKeyRange(fid, pReader->pTsdb->keepCfg.days, pReader->pTsdb->keepCfg.precision, &win.skey, &win.ekey);
+
+      int64_t endKey = (ASCENDING_TRAVERSE(pReader->info.order)) ? win.skey : win.ekey;
+      code = buildBlockFromBufferSequentially(pReader, endKey);      
+      if (code != TSDB_CODE_SUCCESS || pBlock->info.rows > 0) {
+        return code;
+      } else {
+        pStatus->bProcMemPreFileset = false;
+        if (pReader->notifyFn) {
+          STsdReaderNotifyInfo info = {0};
+          info.duration.filesetId = fid;
+          pReader->notifyFn(TSD_READER_NOTIFY_DURATION_START, &info, pReader->notifyParam);
+        }
+        resetTableListIndex(pStatus);
+      }
+    }
+
+    code = buildBlockFromFiles(pReader);
+    if (code != TSDB_CODE_SUCCESS) {
+      return code;
+    }
+
+    if (pBlock->info.rows <= 0) {
+      resetTableListIndex(&pReader->status);
+      int64_t endKey = (ASCENDING_TRAVERSE(pReader->info.order)) ? INT64_MAX : INT64_MIN;
+      code = buildBlockFromBufferSequentially(pReader, endKey);
+    }
+  } else {  // no data in files, let's try the buffer
+    int64_t endKey = (ASCENDING_TRAVERSE(pReader->info.order)) ? INT64_MAX : INT64_MIN;
+    code = buildBlockFromBufferSequentially(pReader, endKey);
+  }
+  return code;
+}
+
+static int32_t doTsdbNextDataBlockFilesFirst(STsdbReader* pReader) {
+  SReaderStatus* pStatus = &pReader->status;
+  int32_t code = TSDB_CODE_SUCCESS;
+  SSDataBlock* pBlock = pReader->resBlockInfo.pResBlock;
+
+  if (pStatus->loadFromFile) {
+    code = buildBlockFromFiles(pReader);
+    if (code != TSDB_CODE_SUCCESS) {
+      return code;
+    }
+
+    if (pBlock->info.rows <= 0) {
+      resetTableListIndex(&pReader->status);
+      int64_t endKey = (ASCENDING_TRAVERSE(pReader->info.order)) ? INT64_MAX : INT64_MIN;
+      code = buildBlockFromBufferSequentially(pReader, endKey);
+    }
+  } else {  // no data in files, let's try the buffer
+    int64_t endKey = (ASCENDING_TRAVERSE(pReader->info.order)) ? INT64_MAX : INT64_MIN;
+    code = buildBlockFromBufferSequentially(pReader, endKey);
+  }
+  return code;
+}
+
 static int32_t doTsdbNextDataBlock2(STsdbReader* pReader, bool* hasNext) {
   int32_t code = TSDB_CODE_SUCCESS;
 
@@ -4375,19 +4492,10 @@ static int32_t doTsdbNextDataBlock2(STsdbReader* pReader, bool* hasNext) {
   if (READ_MODE_COUNT_ONLY == pReader->info.readMode) {
     return tsdbReadRowsCountOnly(pReader);
   }
-
-  if (pStatus->loadFromFile) {
-    code = buildBlockFromFiles(pReader);
-    if (code != TSDB_CODE_SUCCESS) {
-      return code;
-    }
-
-    if (pBlock->info.rows <= 0) {
-      resetTableListIndex(&pReader->status);
-      code = buildBlockFromBufferSequentially(pReader);
-    }
-  } else {  // no data in files, let's try the buffer
-    code = buildBlockFromBufferSequentially(pReader);
+  if (!pReader->bFilesetDelimited) {
+    code = doTsdbNextDataBlockFilesFirst(pReader);
+  } else {
+    code = doTsdbNextDataBlockFilesetDelimited(pReader);
   }
 
   *hasNext = pBlock->info.rows > 0;
@@ -4875,6 +4983,54 @@ int32_t tsdbGetFileBlocksDistInfo2(STsdbReader* pReader, STableBlockDistInfo* pT
   return code;
 }
 
+static void getMemTableTimeRange(STsdbReader* pReader, int64_t* pMaxKey, int64_t* pMinKey) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  int64_t rows = 0;
+
+  SReaderStatus* pStatus = &pReader->status;
+
+  int32_t iter = 0;
+  int64_t maxKey = INT64_MIN;
+  int64_t minKey = INT64_MAX;
+
+  void* pHashIter = tSimpleHashIterate(pStatus->pTableMap, NULL, &iter);
+  while (pHashIter!= NULL) {
+    STableBlockScanInfo* pBlockScanInfo = *(STableBlockScanInfo**)pHashIter;
+
+    STbData* d = NULL;
+    if (pReader->pReadSnap->pMem != NULL) {
+      d = tsdbGetTbDataFromMemTable(pReader->pReadSnap->pMem, pReader->info.suid, pBlockScanInfo->uid);
+      if (d != NULL) {
+        if (d->maxKey > maxKey) {
+          maxKey = d->maxKey;
+        }
+        if (d->minKey < minKey) {
+          minKey = d->minKey;
+        }
+      }
+    }
+
+    STbData* di = NULL;
+    if (pReader->pReadSnap->pIMem != NULL) {
+      di = tsdbGetTbDataFromMemTable(pReader->pReadSnap->pIMem, pReader->info.suid, pBlockScanInfo->uid);
+      if (di != NULL) {
+        if (di->maxKey > maxKey) {
+          maxKey = di->maxKey;
+        }
+        if (di->minKey < minKey) {
+          minKey = di->minKey;
+        }
+      }
+    }
+
+    // current table is exhausted, let's try the next table
+    pHashIter = tSimpleHashIterate(pStatus->pTableMap, pHashIter, &iter);
+  }
+
+  *pMaxKey = maxKey;
+  *pMinKey = minKey;
+}
+
 int64_t tsdbGetNumOfRowsInMemTable2(STsdbReader* pReader) {
   int32_t code = TSDB_CODE_SUCCESS;
   int64_t rows = 0;
@@ -5062,3 +5218,12 @@ void tsdbReaderSetId2(STsdbReader* pReader, const char* idstr) {
 
 void tsdbReaderSetCloseFlag(STsdbReader* pReader) { /*pReader->code = TSDB_CODE_TSC_QUERY_CANCELLED;*/
 }
+
+void tsdbSetFilesetDelimited(STsdbReader* pReader) {
+  pReader->bFilesetDelimited = true;
+}
+
+void tsdbReaderSetNotifyCb(STsdbReader* pReader, TsdReaderNotifyCbFn notifyFn, void* param) {
+  pReader->notifyFn = notifyFn;
+  pReader->notifyParam = param;
+}
diff --git a/source/dnode/vnode/src/tsdb/tsdbReadUtil.h b/source/dnode/vnode/src/tsdb/tsdbReadUtil.h
index e9c7449082..f4fa7bc2c8 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReadUtil.h
+++ b/source/dnode/vnode/src/tsdb/tsdbReadUtil.h
@@ -22,6 +22,7 @@ extern "C" {
 
 #include "tsdbDataFileRW.h"
 #include "tsdbUtil2.h"
+#include "storageapi.h"
 
 #define ASCENDING_TRAVERSE(o) (o == TSDB_ORDER_ASC)
 
@@ -200,6 +201,12 @@ typedef struct SReaderStatus {
   SArray*               pLDataIterArray;
   SRowMerger            merger;
   SColumnInfoData*      pPrimaryTsCol;  // primary time stamp output col info data
+  bool                  bProcMemPreFileset;
+  int64_t               memTableMaxKey;
+  int64_t               memTableMinKey;
+  int64_t               prevFilesetStartKey;
+  int64_t               prevFilesetEndKey;
+  bool                  bProcMemFirstFileset;
 } SReaderStatus;
 
 struct STsdbReader {
@@ -223,6 +230,9 @@ struct STsdbReader {
   SBlockInfoBuf      blockInfoBuf;
   EContentData       step;
   STsdbReader*       innerReader[2];
+  bool                 bFilesetDelimited;   // duration by duration output
+  TsdReaderNotifyCbFn  notifyFn;
+  void*              notifyParam;
 };
 
 typedef struct SBrinRecordIter {
diff --git a/source/dnode/vnode/src/vnd/vnodeInitApi.c b/source/dnode/vnode/src/vnd/vnodeInitApi.c
index 6584b7072f..6b7b778cd5 100644
--- a/source/dnode/vnode/src/vnd/vnodeInitApi.c
+++ b/source/dnode/vnode/src/vnd/vnodeInitApi.c
@@ -60,6 +60,9 @@ void initTsdbReaderAPI(TsdReader* pReader) {
 
   pReader->tsdSetQueryTableList = tsdbSetTableList2;
   pReader->tsdSetReaderTaskId = (void (*)(void*, const char*))tsdbReaderSetId2;
+
+  pReader->tsdSetFilesetDelimited = (void (*)(void*))tsdbSetFilesetDelimited;
+  pReader->tsdSetSetNotifyCb = (void (*)(void*, TsdReaderNotifyCbFn, void*))tsdbReaderSetNotifyCb;
 }
 
 void initMetadataAPI(SStoreMeta* pMeta) {
diff --git a/source/libs/executor/inc/executorInt.h b/source/libs/executor/inc/executorInt.h
index 865fe98be9..cba26c46b5 100644
--- a/source/libs/executor/inc/executorInt.h
+++ b/source/libs/executor/inc/executorInt.h
@@ -270,6 +270,7 @@ typedef struct STableScanInfo {
   bool            hasGroupByTag;
   bool            countOnly;
   //  TsdReader    readerAPI;
+  bool            filesetDelimited;
 } STableScanInfo;
 
 typedef struct STableMergeScanInfo {
@@ -297,6 +298,9 @@ typedef struct STableMergeScanInfo {
   SHashObj*        mSkipTables;
   int64_t          mergeLimit;
   SSortExecInfo   sortExecInfo;
+  bool             bNewFileset;
+  bool             bOnlyRetrieveBlock;
+  bool             filesetDelimited;
 } STableMergeScanInfo;
 
 typedef struct STagScanFilterContext {
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 4c212afce8..a92770b1f9 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -893,7 +893,9 @@ static SSDataBlock* groupSeqTableScan(SOperatorInfo* pOperator) {
     if (code != TSDB_CODE_SUCCESS) {
       T_LONG_JMP(pTaskInfo->env, code);
     }
-  
+    if (pInfo->filesetDelimited) {
+      pAPI->tsdReader.tsdSetFilesetDelimited(pInfo->base.dataReader);
+    }
     if (pInfo->pResBlock->info.capacity > pOperator->resultInfo.capacity) {
       pOperator->resultInfo.capacity = pInfo->pResBlock->info.capacity;
     }
@@ -1085,6 +1087,8 @@ SOperatorInfo* createTableScanOperatorInfo(STableScanPhysiNode* pTableScanNode,
     pInfo->countOnly = true;
   }
 
+  pInfo->filesetDelimited = pTableScanNode->filesetDelimited;
+
   taosLRUCacheSetStrictCapacity(pInfo->base.metaCache.pTableMetaEntryCache, false);
   pOperator->fpSet = createOperatorFpSet(optrDummyOpenFn, doTableScan, NULL, destroyTableScanOperatorInfo,
                                          optrDefaultBufFn, getTableScannerExecInfo, optrDefaultGetNextExtFn, NULL);
@@ -3223,6 +3227,7 @@ static int32_t tableMergeScanDoSkipTable(STableMergeScanInfo* pInfo, SSDataBlock
     tSimpleHashPut(pInfo->mTableNumRows, &pBlock->info.id.uid, sizeof(pBlock->info.id.uid), &nRows, sizeof(nRows));
   } else {
     *(int64_t*)pNum = *(int64_t*)pNum + pBlock->info.rows;
+    nRows = *(int64_t*)pNum;
   }
 
   if (nRows >= pInfo->mergeLimit) {
@@ -3251,23 +3256,28 @@ static SSDataBlock* getBlockForTableMergeScan(void* param) {
 
   STsdbReader* reader = pInfo->base.dataReader;
   while (true) {
-    code = pAPI->tsdReader.tsdNextDataBlock(reader, &hasNext);
-    if (code != 0) {
-      pAPI->tsdReader.tsdReaderReleaseDataBlock(reader);
-      qError("table merge scan fetch next data block error code: %d, %s", code, GET_TASKID(pTaskInfo));
-      T_LONG_JMP(pTaskInfo->env, code);
-    }
+    if (!pInfo->bOnlyRetrieveBlock) {
+      code = pAPI->tsdReader.tsdNextDataBlock(reader, &hasNext);
+      if (code != 0) {
+        pAPI->tsdReader.tsdReaderReleaseDataBlock(reader);
+        qError("table merge scan fetch next data block error code: %d, %s", code, GET_TASKID(pTaskInfo));
+        T_LONG_JMP(pTaskInfo->env, code);
+      }
 
-    if (!hasNext) {
-      break;
-    }
+      if (!hasNext || isTaskKilled(pTaskInfo)) {
+        pInfo->bNewFileset = false;
+        if (isTaskKilled(pTaskInfo)) {
+          qInfo("table merge scan fetch next data block found task killed. %s", GET_TASKID(pTaskInfo));
+          pAPI->tsdReader.tsdReaderReleaseDataBlock(reader);
+        }
+        break;
+      }
 
-    if (isTaskKilled(pTaskInfo)) {
-      qInfo("table merge scan fetch next data block found task killed. %s", GET_TASKID(pTaskInfo));
-      pAPI->tsdReader.tsdReaderReleaseDataBlock(reader);
-      break;
+      if (pInfo->bNewFileset) {
+        pInfo->bOnlyRetrieveBlock = true;
+        return NULL;
+      }
     }
-
     // process this data block based on the probabilities
     bool processThisBlock = processBlockWithProbability(&pInfo->sample);
     if (!processThisBlock) {
@@ -3276,7 +3286,9 @@ static SSDataBlock* getBlockForTableMergeScan(void* param) {
 
     uint32_t status = 0;
     code = loadDataBlock(pOperator, &pInfo->base, pBlock, &status);
-    //    code = loadDataBlockFromOneTable(pOperator, pTableScanInfo, pBlock, &status);
+    if (pInfo->bOnlyRetrieveBlock) {
+      pInfo->bOnlyRetrieveBlock = false;
+    }    
     if (code != TSDB_CODE_SUCCESS) {
       qInfo("table merge scan load datablock code %d, %s", code, GET_TASKID(pTaskInfo));
       T_LONG_JMP(pTaskInfo->env, code);
@@ -3299,7 +3311,7 @@ static SSDataBlock* getBlockForTableMergeScan(void* param) {
 
     pOperator->resultInfo.totalRows += pBlock->info.rows;
     pInfo->base.readRecorder.elapsedTime += (taosGetTimestampUs() - st) / 1000.0;
-
+    
     return pBlock;
   }
 
@@ -3335,6 +3347,60 @@ int32_t dumpQueryTableCond(const SQueryTableDataCond* src, SQueryTableDataCond*
   return 0;
 }
 
+void tableMergeScanTsdbNotifyCb(ETsdReaderNotifyType type, STsdReaderNotifyInfo* info, void* param) {
+  STableMergeScanInfo* pTmsInfo = param;
+  pTmsInfo->bNewFileset = true;
+  return;
+}
+
+int32_t startDurationForGroupTableMergeScan(SOperatorInfo* pOperator) {
+  STableMergeScanInfo* pInfo = pOperator->info;
+  SExecTaskInfo*       pTaskInfo = pOperator->pTaskInfo;
+  int32_t code = TSDB_CODE_SUCCESS;
+  int32_t numOfTable = pInfo->tableEndIndex - pInfo->tableStartIndex + 1;
+
+  pInfo->bNewFileset = false;
+
+  pInfo->sortBufSize = 2048 * pInfo->bufPageSize;
+  int32_t numOfBufPage = pInfo->sortBufSize / pInfo->bufPageSize;
+  pInfo->pSortHandle = tsortCreateSortHandle(pInfo->pSortInfo, SORT_BLOCK_TS_MERGE, pInfo->bufPageSize, numOfBufPage,
+                                             pInfo->pSortInputBlock, pTaskInfo->id.str, 0, 0, 0);
+
+  tsortSetMergeLimit(pInfo->pSortHandle, pInfo->mergeLimit);
+  tsortSetAbortCheckFn(pInfo->pSortHandle, isTaskKilled, pOperator->pTaskInfo);
+
+  tsortSetFetchRawDataFp(pInfo->pSortHandle, getBlockForTableMergeScan, NULL, NULL);
+
+  STableMergeScanSortSourceParam *param = taosMemoryCalloc(1, sizeof(STableMergeScanSortSourceParam));
+  param->pOperator = pOperator;
+
+  SSortSource* ps = taosMemoryCalloc(1, sizeof(SSortSource));
+  ps->param = param;
+  ps->onlyRef = false;
+  tsortAddSource(pInfo->pSortHandle, ps);
+
+  if (numOfTable == 1) {
+    tsortSetSingleTableMerge(pInfo->pSortHandle);
+  } else {
+    code = tsortOpen(pInfo->pSortHandle);
+  }
+  return code;
+}
+
+void stopDurationForGroupTableMergeScan(SOperatorInfo* pOperator) {
+  STableMergeScanInfo* pInfo = pOperator->info;
+
+  SSortExecInfo sortExecInfo = tsortGetSortExecInfo(pInfo->pSortHandle);
+  pInfo->sortExecInfo.sortMethod = sortExecInfo.sortMethod;
+  pInfo->sortExecInfo.sortBuffer = sortExecInfo.sortBuffer;
+  pInfo->sortExecInfo.loops += sortExecInfo.loops;
+  pInfo->sortExecInfo.readBytes += sortExecInfo.readBytes;
+  pInfo->sortExecInfo.writeBytes += sortExecInfo.writeBytes;
+
+  tsortDestroySortHandle(pInfo->pSortHandle);
+  pInfo->pSortHandle = NULL;
+}
+
 int32_t startGroupTableMergeScan(SOperatorInfo* pOperator) {
   STableMergeScanInfo* pInfo = pOperator->info;
   SExecTaskInfo*       pTaskInfo = pOperator->pTaskInfo;
@@ -3358,43 +3424,16 @@ int32_t startGroupTableMergeScan(SOperatorInfo* pOperator) {
 
   tSimpleHashClear(pInfo->mTableNumRows);
 
-  size_t szRow = blockDataGetRowSize(pInfo->pResBlock);   
-//  if (pInfo->mergeLimit != -1) {
-//    pInfo->pSortHandle = tsortCreateSortHandle(pInfo->pSortInfo, SORT_SINGLESOURCE_SORT, -1, -1,
-//                                              NULL, pTaskInfo->id.str, pInfo->mergeLimit, szRow+8, tsPQSortMemThreshold * 1024* 1024);
-//  } else
-  {
-    pInfo->sortBufSize = 2048 * pInfo->bufPageSize;
-    int32_t numOfBufPage = pInfo->sortBufSize / pInfo->bufPageSize;
-    pInfo->pSortHandle = tsortCreateSortHandle(pInfo->pSortInfo, SORT_BLOCK_TS_MERGE, pInfo->bufPageSize, numOfBufPage,
-                                              pInfo->pSortInputBlock, pTaskInfo->id.str, 0, 0, 0);
-
-    tsortSetMergeLimit(pInfo->pSortHandle, pInfo->mergeLimit);
-    tsortSetAbortCheckFn(pInfo->pSortHandle, isTaskKilled, pOperator->pTaskInfo);
-  }
-
-  tsortSetFetchRawDataFp(pInfo->pSortHandle, getBlockForTableMergeScan, NULL, NULL);
-
-  // one table has one data block
   int32_t numOfTable = tableEndIdx - tableStartIdx + 1;
-
-  STableMergeScanSortSourceParam *param = taosMemoryCalloc(1, sizeof(STableMergeScanSortSourceParam));
-  param->pOperator = pOperator;
   STableKeyInfo* startKeyInfo = tableListGetInfo(pInfo->base.pTableListInfo, tableStartIdx);
   pAPI->tsdReader.tsdReaderOpen(pHandle->vnode, &pInfo->base.cond, startKeyInfo, numOfTable, pInfo->pReaderBlock,
                                 (void**)&pInfo->base.dataReader, GET_TASKID(pTaskInfo), false, &pInfo->mSkipTables);
-
-  SSortSource* ps = taosMemoryCalloc(1, sizeof(SSortSource));
-  ps->param = param;
-  ps->onlyRef = false;
-  tsortAddSource(pInfo->pSortHandle, ps);
-
-  int32_t code = TSDB_CODE_SUCCESS;
-  if (numOfTable == 1) {
-    tsortSetSingleTableMerge(pInfo->pSortHandle);
-  } else {
-    code = tsortOpen(pInfo->pSortHandle);
+  if (pInfo->filesetDelimited) {
+    pAPI->tsdReader.tsdSetFilesetDelimited(pInfo->base.dataReader);
   }
+  pAPI->tsdReader.tsdSetSetNotifyCb(pInfo->base.dataReader, tableMergeScanTsdbNotifyCb, pInfo);
+
+  int32_t code = startDurationForGroupTableMergeScan(pOperator);
 
   if (code != TSDB_CODE_SUCCESS) {
     T_LONG_JMP(pTaskInfo->env, terrno);
@@ -3408,21 +3447,13 @@ int32_t stopGroupTableMergeScan(SOperatorInfo* pOperator) {
   SExecTaskInfo*       pTaskInfo = pOperator->pTaskInfo;
   SStorageAPI*         pAPI = &pTaskInfo->storageAPI;
 
-  SSortExecInfo sortExecInfo = tsortGetSortExecInfo(pInfo->pSortHandle);
-  pInfo->sortExecInfo.sortMethod = sortExecInfo.sortMethod;
-  pInfo->sortExecInfo.sortBuffer = sortExecInfo.sortBuffer;
-  pInfo->sortExecInfo.loops += sortExecInfo.loops;
-  pInfo->sortExecInfo.readBytes += sortExecInfo.readBytes;
-  pInfo->sortExecInfo.writeBytes += sortExecInfo.writeBytes;
+  stopDurationForGroupTableMergeScan(pOperator);
 
   if (pInfo->base.dataReader != NULL) {
     pAPI->tsdReader.tsdReaderClose(pInfo->base.dataReader);
     pInfo->base.dataReader = NULL;
   }
 
-  tsortDestroySortHandle(pInfo->pSortHandle);
-  pInfo->pSortHandle = NULL;
-
   resetLimitInfoForNextGroup(&pInfo->limitInfo);
   taosHashCleanup(pInfo->mSkipTables);
   pInfo->mSkipTables = NULL;
@@ -3505,17 +3536,22 @@ SSDataBlock* doTableMergeScan(SOperatorInfo* pOperator) {
       pOperator->resultInfo.totalRows += pBlock->info.rows;
       return pBlock;
     } else {
-      // Data of this group are all dumped, let's try the next group
-      stopGroupTableMergeScan(pOperator);
-      if (pInfo->tableEndIndex >= tableListSize - 1) {
-        setOperatorCompleted(pOperator);
-        break;
-      }
+      if (pInfo->bNewFileset) {
+        stopDurationForGroupTableMergeScan(pOperator);
+        startDurationForGroupTableMergeScan(pOperator);
+      } else {
+        // Data of this group are all dumped, let's try the next group
+        stopGroupTableMergeScan(pOperator);
+        if (pInfo->tableEndIndex >= tableListSize - 1) {
+          setOperatorCompleted(pOperator);
+          break;
+        }
 
-      pInfo->tableStartIndex = pInfo->tableEndIndex + 1;
-      pInfo->groupId = tableListGetInfo(pInfo->base.pTableListInfo, pInfo->tableStartIndex)->groupId;
-      startGroupTableMergeScan(pOperator);
-      resetLimitInfoForNextGroup(&pInfo->limitInfo);
+        pInfo->tableStartIndex = pInfo->tableEndIndex + 1;
+        pInfo->groupId = tableListGetInfo(pInfo->base.pTableListInfo, pInfo->tableStartIndex)->groupId;
+        startGroupTableMergeScan(pOperator);
+        resetLimitInfoForNextGroup(&pInfo->limitInfo);
+      }
     }
   }
 
@@ -3641,6 +3677,7 @@ SOperatorInfo* createTableMergeScanOperatorInfo(STableScanPhysiNode* pTableScanN
   uint32_t nCols = taosArrayGetSize(pInfo->pResBlock->pDataBlock);
   pInfo->bufPageSize = getProperSortPageSize(rowSize, nCols);
 
+  pInfo->filesetDelimited = pTableScanNode->filesetDelimited;
   setOperatorInfo(pOperator, "TableMergeScanOperator", QUERY_NODE_PHYSICAL_PLAN_TABLE_MERGE_SCAN, false, OP_NOT_OPENED,
                   pInfo, pTaskInfo);
   pOperator->exprSupp.numOfExprs = numOfCols;
diff --git a/source/libs/nodes/src/nodesCloneFuncs.c b/source/libs/nodes/src/nodesCloneFuncs.c
index ce23928268..97438b84a6 100644
--- a/source/libs/nodes/src/nodesCloneFuncs.c
+++ b/source/libs/nodes/src/nodesCloneFuncs.c
@@ -423,6 +423,7 @@ static int32_t logicScanCopy(const SScanLogicNode* pSrc, SScanLogicNode* pDst) {
   COPY_SCALAR_FIELD(igLastNull);
   COPY_SCALAR_FIELD(groupOrderScan);
   COPY_SCALAR_FIELD(onlyMetaCtbIdx);
+  COPY_SCALAR_FIELD(filesetDelimited);
   return TSDB_CODE_SUCCESS;
 }
 
@@ -650,6 +651,7 @@ static int32_t physiTableScanCopy(const STableScanPhysiNode* pSrc, STableScanPhy
   COPY_SCALAR_FIELD(triggerType);
   COPY_SCALAR_FIELD(watermark);
   COPY_SCALAR_FIELD(igExpired);
+  COPY_SCALAR_FIELD(filesetDelimited);
   return TSDB_CODE_SUCCESS;
 }
 
diff --git a/source/libs/nodes/src/nodesCodeFuncs.c b/source/libs/nodes/src/nodesCodeFuncs.c
index f3087dd5d4..d26cdcf401 100644
--- a/source/libs/nodes/src/nodesCodeFuncs.c
+++ b/source/libs/nodes/src/nodesCodeFuncs.c
@@ -677,6 +677,7 @@ static const char* jkScanLogicPlanDataRequired = "DataRequired";
 static const char* jkScanLogicPlanTagCond = "TagCond";
 static const char* jkScanLogicPlanGroupTags = "GroupTags";
 static const char* jkScanLogicPlanOnlyMetaCtbIdx = "OnlyMetaCtbIdx";
+static const char* jkScanLogicPlanFilesetDelimited = "FilesetDelimited";
 
 static int32_t logicScanNodeToJson(const void* pObj, SJson* pJson) {
   const SScanLogicNode* pNode = (const SScanLogicNode*)pObj;
@@ -721,6 +722,9 @@ static int32_t logicScanNodeToJson(const void* pObj, SJson* pJson) {
   if (TSDB_CODE_SUCCESS == code) {
     code = tjsonAddBoolToObject(pJson, jkScanLogicPlanOnlyMetaCtbIdx, pNode->onlyMetaCtbIdx);
   }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = tjsonAddBoolToObject(pJson, jkScanLogicPlanFilesetDelimited, pNode->filesetDelimited);
+  }
   return code;
 }
 
@@ -768,7 +772,9 @@ static int32_t jsonToLogicScanNode(const SJson* pJson, void* pObj) {
   if (TSDB_CODE_SUCCESS == code) {
     code = tjsonGetBoolValue(pJson, jkScanLogicPlanOnlyMetaCtbIdx, &pNode->onlyMetaCtbIdx);
   }
-  
+  if (TSDB_CODE_SUCCESS == code) {
+    code = tjsonGetBoolValue(pJson, jkScanLogicPlanFilesetDelimited, &pNode->filesetDelimited);
+  }
   return code;
 }
 
@@ -1830,6 +1836,7 @@ static const char* jkTableScanPhysiPlanTags = "Tags";
 static const char* jkTableScanPhysiPlanSubtable = "Subtable";
 static const char* jkTableScanPhysiPlanAssignBlockUid = "AssignBlockUid";
 static const char* jkTableScanPhysiPlanIgnoreUpdate = "IgnoreUpdate";
+static const char* jkTableScanPhysiPlanFilesetDelimited = "FilesetDelimited";
 
 static int32_t physiTableScanNodeToJson(const void* pObj, SJson* pJson) {
   const STableScanPhysiNode* pNode = (const STableScanPhysiNode*)pObj;
@@ -1898,6 +1905,9 @@ static int32_t physiTableScanNodeToJson(const void* pObj, SJson* pJson) {
   if (TSDB_CODE_SUCCESS == code) {
     code = tjsonAddIntegerToObject(pJson, jkTableScanPhysiPlanIgnoreUpdate, pNode->igCheckUpdate);
   }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = tjsonAddBoolToObject(pJson, jkTableScanPhysiPlanFilesetDelimited, pNode->filesetDelimited);
+  }
 
   return code;
 }
@@ -1969,6 +1979,9 @@ static int32_t jsonToPhysiTableScanNode(const SJson* pJson, void* pObj) {
   if (TSDB_CODE_SUCCESS == code) {
     code = tjsonGetTinyIntValue(pJson, jkTableScanPhysiPlanIgnoreUpdate, &pNode->igCheckUpdate);
   }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = tjsonGetBoolValue(pJson, jkTableScanPhysiPlanFilesetDelimited, &pNode->filesetDelimited);
+  }
 
   return code;
 }
diff --git a/source/libs/nodes/src/nodesMsgFuncs.c b/source/libs/nodes/src/nodesMsgFuncs.c
index 9804f2075b..d6eb3360aa 100644
--- a/source/libs/nodes/src/nodesMsgFuncs.c
+++ b/source/libs/nodes/src/nodesMsgFuncs.c
@@ -2167,7 +2167,9 @@ static int32_t physiTableScanNodeInlineToMsg(const void* pObj, STlvEncoder* pEnc
   if (TSDB_CODE_SUCCESS == code) {
     code = tlvEncodeValueI8(pEncoder, pNode->igCheckUpdate);
   }
-
+  if (TSDB_CODE_SUCCESS == code) {
+    code = tlvEncodeValueBool(pEncoder, pNode->filesetDelimited);
+  }
   return code;
 }
 
@@ -2246,6 +2248,9 @@ static int32_t msgToPhysiTableScanNodeInline(STlvDecoder* pDecoder, void* pObj)
   if (TSDB_CODE_SUCCESS == code) {
     code = tlvDecodeValueI8(pDecoder, &pNode->igCheckUpdate);
   }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = tlvDecodeValueBool(pDecoder, &pNode->filesetDelimited);
+  }
 
   return code;
 }
diff --git a/source/libs/planner/src/planOptimizer.c b/source/libs/planner/src/planOptimizer.c
index e71e18d37d..aa3181e166 100644
--- a/source/libs/planner/src/planOptimizer.c
+++ b/source/libs/planner/src/planOptimizer.c
@@ -1400,6 +1400,7 @@ static int32_t sortPriKeyOptApply(SOptimizeContext* pCxt, SLogicSubplan* pLogicS
       pScan->node.outputTsOrder = order;
       if (TSDB_SUPER_TABLE == pScan->tableType) {
         pScan->scanType = SCAN_TYPE_TABLE_MERGE;
+        pScan->filesetDelimited = true;
         pScan->node.resultDataOrder = DATA_ORDER_LEVEL_GLOBAL;
         pScan->node.requireDataOrder = DATA_ORDER_LEVEL_GLOBAL;
       }
diff --git a/source/libs/planner/src/planPhysiCreater.c b/source/libs/planner/src/planPhysiCreater.c
index 598bce3133..d1fbd0681d 100644
--- a/source/libs/planner/src/planPhysiCreater.c
+++ b/source/libs/planner/src/planPhysiCreater.c
@@ -622,6 +622,7 @@ static int32_t createTableScanPhysiNode(SPhysiPlanContext* pCxt, SSubplan* pSubp
   pTableScan->igExpired = pScanLogicNode->igExpired;
   pTableScan->igCheckUpdate = pScanLogicNode->igCheckUpdate;
   pTableScan->assignBlockUid = pCxt->pPlanCxt->rSmaQuery ? true : false;
+  pTableScan->filesetDelimited = pScanLogicNode->filesetDelimited;
 
   int32_t code = createScanPhysiNodeFinalize(pCxt, pSubplan, pScanLogicNode, (SScanPhysiNode*)pTableScan, pPhyNode);
   if (TSDB_CODE_SUCCESS == code) {
diff --git a/source/libs/planner/src/planSpliter.c b/source/libs/planner/src/planSpliter.c
index 15efaae7f4..ad0031f815 100644
--- a/source/libs/planner/src/planSpliter.c
+++ b/source/libs/planner/src/planSpliter.c
@@ -692,6 +692,7 @@ static void stbSplSetTableMergeScan(SLogicNode* pNode) {
   if (QUERY_NODE_LOGIC_PLAN_SCAN == nodeType(pNode)) {
     SScanLogicNode* pScan = (SScanLogicNode*)pNode;
     pScan->scanType = SCAN_TYPE_TABLE_MERGE;
+    pScan->filesetDelimited = true;
     if (NULL != pScan->pGroupTags) {
       pScan->groupSort = true;
     }
@@ -1243,6 +1244,7 @@ static int32_t stbSplCreateMergeScanNode(SScanLogicNode* pScan, SLogicNode** pOu
   SNodeList* pMergeKeys = NULL;
   if (TSDB_CODE_SUCCESS == code) {
     pMergeScan->scanType = SCAN_TYPE_TABLE_MERGE;
+    pMergeScan->filesetDelimited = true;
     pMergeScan->node.pChildren = pChildren;
     splSetParent((SLogicNode*)pMergeScan);
     code = stbSplCreateMergeKeysByPrimaryKey(stbSplFindPrimaryKeyFromScan(pMergeScan),
diff --git a/source/libs/planner/src/planUtil.c b/source/libs/planner/src/planUtil.c
index 1c7c937b7f..2da270e42d 100644
--- a/source/libs/planner/src/planUtil.c
+++ b/source/libs/planner/src/planUtil.c
@@ -164,6 +164,7 @@ static int32_t adjustScanDataRequirement(SScanLogicNode* pScan, EDataOrderLevel
     pScan->scanType = SCAN_TYPE_TABLE;
   } else if (TSDB_SUPER_TABLE == pScan->tableType) {
     pScan->scanType = SCAN_TYPE_TABLE_MERGE;
+    pScan->filesetDelimited = true;
   }
 
   if (TSDB_NORMAL_TABLE != pScan->tableType && TSDB_CHILD_TABLE != pScan->tableType) {