diff --git a/source/libs/executor/inc/groupcache.h b/source/libs/executor/inc/groupcache.h
index 6a19b9bd08..ace43813e2 100755
--- a/source/libs/executor/inc/groupcache.h
+++ b/source/libs/executor/inc/groupcache.h
@@ -27,11 +27,11 @@ typedef struct SGcBlkBufBasic {
   int64_t           blkId;
   int64_t           offset;
   int64_t           bufSize;
-  uint32_t          fileId;
 } SGcBlkBufBasic;
 
 typedef struct SGcBlkBufInfo {
   SGcBlkBufBasic    basic;
+  uint32_t          fileId;
   void*             next;
   void*             pBuf;
   SGcDownstreamCtx* pCtx;
@@ -39,10 +39,10 @@ typedef struct SGcBlkBufInfo {
 } SGcBlkBufInfo;
 #pragma pack(pop)
 
-typedef struct SGcVgroupFileFd {
+typedef struct SGroupCacheFileFd {
   TdThreadMutex mutex;
   TdFilePtr     fd;
-} SGcVgroupFileFd;
+} SGroupCacheFileFd;
 
 typedef struct SGcVgroupCtx {
   SArray*         pTbList;
@@ -117,7 +117,7 @@ typedef struct SGcDownstreamCtx {
   SHashObj*     pSessions;  
   SHashObj*     pWaitSessions; 
   int32_t       cacheFileFdNum;
-  TdFilePtr     cacheFileFd[GROUP_CACHE_MAX_FILE_FDS];
+  SGroupCacheFileFd cacheFileFd;
   char          baseFilename[PATH_MAX];
 } SGcDownstreamCtx;
 
@@ -126,7 +126,6 @@ typedef struct SGcSessionCtx {
   SGcOperatorParam* pParam;
   SGroupCacheData*  pGroupData;
   int64_t           lastBlkId;
-  int64_t           nextOffset;
   bool              semInit;
   tsem_t            waitSem;
   bool              newFetch;
diff --git a/source/libs/executor/src/groupcacheoperator.c b/source/libs/executor/src/groupcacheoperator.c
index a219c4c0a0..1cb0a04603 100755
--- a/source/libs/executor/src/groupcacheoperator.c
+++ b/source/libs/executor/src/groupcacheoperator.c
@@ -85,7 +85,7 @@ static void destroyGroupCacheOperator(void* param) {
   taosMemoryFreeClear(param);
 }
 
-static FORCE_INLINE int32_t initOpenCacheFile(SGcVgroupFileFd* pFileFd, char* filename) {
+static FORCE_INLINE int32_t initOpenCacheFile(SGroupCacheFileFd* pFileFd, char* filename) {
   TdFilePtr newFd = taosOpenFile(filename, TD_FILE_CREATE|TD_FILE_READ|TD_FILE_WRITE|TD_FILE_AUTO_DEL);
   if (NULL == newFd) {
     return TAOS_SYSTEM_ERROR(errno);
@@ -95,13 +95,13 @@ static FORCE_INLINE int32_t initOpenCacheFile(SGcVgroupFileFd* pFileFd, char* fi
   return TSDB_CODE_SUCCESS;
 }
 
-static int32_t acquireVgroupFileFd(SGroupCacheOperatorInfo* pGCache, SGcDownstreamCtx* pCtx, SGcVgroupCtx* pVgCtx, uint32_t fileId, SGcVgroupFileFd** ppFd) {
+static int32_t acquireVgroupFileFd(SGroupCacheOperatorInfo* pGCache, SGcDownstreamCtx* pCtx, SGcVgroupCtx* pVgCtx, uint32_t fileId, SGroupCacheFileFd** ppFd) {
   int32_t code = TSDB_CODE_SUCCESS;
-  SGcVgroupFileFd* pTmp = tSimpleHashGet(pVgCtx->pCacheFile, &fileId, sizeof(fileId));
+  SGroupCacheFileFd* pTmp = tSimpleHashGet(pVgCtx->pCacheFile, &fileId, sizeof(fileId));
   if (NULL == pTmp) {
     sprintf(pVgCtx->baseFilename[pVgCtx->baseNameLen], "_%u", fileId);
 
-    SGcVgroupFileFd newVgFd = {0};
+    SGroupCacheFileFd newVgFd = {0};
     tSimpleHashPut(pVgCtx->pCacheFile, &fileId, sizeof(fileId), &newVgFd, sizeof(newVgFd));
     pTmp = tSimpleHashGet(pVgCtx->pCacheFile, &fileId, sizeof(fileId));
 
@@ -117,7 +117,7 @@ static int32_t acquireVgroupFileFd(SGroupCacheOperatorInfo* pGCache, SGcDownstre
   return TSDB_CODE_SUCCESS;
 }
 
-static FORCE_INLINE void releaseVgroupFileFd(SGcVgroupFileFd* pFd) {
+static FORCE_INLINE void releaseVgroupFileFd(SGroupCacheFileFd* pFd) {
   taosThreadMutexUnlock(&pFd->mutex);
 }
 
@@ -126,27 +126,30 @@ static int32_t saveBatchBlocksToDisk(SGroupCacheOperatorInfo* pGCache, SGcBlkBuf
   SGcBlkBufBasic blkBasic;
   
   while (NULL != pHead) {
-    if (NULL == pHead->pCtx->cacheFileFd[0]) {
-      pHead->pCtx->cacheFileFd[0] = taosOpenFile(pHead->pCtx->baseFilename, TD_FILE_CREATE|TD_FILE_READ|TD_FILE_WRITE|TD_FILE_AUTO_DEL);
-      if (NULL == pHead->pCtx->cacheFileFd[0]) {
-        return TAOS_SYSTEM_ERROR(errno);
-      }
-      pHead->pCtx->cacheFileFdNum = 1;
+    SGroupCacheFileFd *pFd;
+    code = acquireDownstreamFileFd(pHead->pCtx, &pFd);
+    if (code) {
+      return code;
     }
-
-    int32_t ret = taosLSeekFile(pHead->pCtx->cacheFileFd[0], pHead->offset, SEEK_SET);
+    
+    int32_t ret = taosLSeekFile(pFd->fd, pHead->basic.offset, SEEK_SET);
     if (ret == -1) {
+      releaseDownstreamFileFd();
       return TAOS_SYSTEM_ERROR(errno);
     }
     
-    ret = (int32_t)taosWriteFile(pHead->pCtx->cacheFileFd[0], pHead->pBuf, pHead->bufSize);
-    if (ret != pHead->bufSize) {
+    ret = (int32_t)taosWriteFile(pFd->fd, pHead->pBuf, pHead->basic.bufSize);
+    if (ret != pHead->basic.bufSize) {
+      releaseDownstreamFileFd();
       return TAOS_SYSTEM_ERROR(errno);
     }
+    releaseDownstreamFileFd();
 
-    taos
-
-    int64_t blkId = pHead->blkId;
+    taosWLockLatch(&pHead->pGroup->batchList.lock);
+    taosArrayPush(pHead->pGroup->batchList.pList, &pHead->basic);
+    taosWUnLockLatch(&pHead->pGroup->batchList.lock);
+    
+    int64_t blkId = pHead->basic.blkId;
     pHead = pHead->next;
 
     taosHashRemove(pGCache->blkCache.pDirtyBlk, &blkId, sizeof(blkId));
@@ -159,27 +162,32 @@ static int32_t saveBatchBlocksToDisk(SGroupCacheOperatorInfo* pGCache, SGcBlkBuf
 static int32_t saveSeqBlocksToDisk(SGroupCacheOperatorInfo* pGCache, SGcBlkBufInfo* pHead) {
   int32_t code = TSDB_CODE_SUCCESS;
 
-  SGcVgroupFileFd* pFd = NULL;
+  SGroupCacheFileFd* pFd = NULL;
   while (NULL != pHead) {
     code = acquireVgroupFileFd(pGCache, pHead->pCtx, pHead->pGroup->pVgCtx, pHead->fileId, &pFd);
     if (TSDB_CODE_SUCCESS != code) {
       return code;
     }
 
-    int32_t ret = taosLSeekFile(pFd->fd, pHead->offset, SEEK_SET);
+    int32_t ret = taosLSeekFile(pFd->fd, pHead->basic.offset, SEEK_SET);
     if (ret == -1) {
       code= TAOS_SYSTEM_ERROR(errno);
       return code;
     }
     
-    code = (int32_t)taosWriteFile(pFd->fd, pHead->pBuf, pHead->bufSize);
+    code = (int32_t)taosWriteFile(pFd->fd, pHead->pBuf, pHead->basic.bufSize);
     releaseVgroupFileFd(pFd);
-    if (code != pHead->bufSize) {
+    if (code != pHead->basic.bufSize) {
       code= TAOS_SYSTEM_ERROR(errno);
       return code;
     }
+
+    taosWLockLatch(&pHead->pGroup->batchList.lock);
+    taosArrayPush(pHead->pGroup->batchList.pList, &pHead->basic);
+    taosWUnLockLatch(&pHead->pGroup->batchList.lock);
+
     
-    int64_t blkId = pHead->blkId;
+    int64_t blkId = pHead->basic.blkId;
     pHead = pHead->next;
     
     taosHashRemove(pGCache->blkCache.pDirtyBlk, &blkId, sizeof(blkId));
@@ -332,23 +340,114 @@ static int32_t buildGroupCacheResultBlock(SGroupCacheOperatorInfo* pGCache, int3
   return blockDataFromBuf(*ppRes, pBuf);
 }
 
-static int32_t retrieveBlkFromBufCache(SGroupCacheOperatorInfo* pGCache, SGroupCacheData* pGrp, int64_t sessionId, int64_t blkId, int64_t* nextOffset, SSDataBlock** ppRes) {
+static int32_t acquireDownstreamFileFd(SGcDownstreamCtx* pCtx, SGroupCacheFileFd** ppFd) {
+  if (NULL == pCtx->cacheFileFd.fd) {
+    pCtx->cacheFileFd.fd = taosOpenFile(pCtx->baseFilename, TD_FILE_CREATE|TD_FILE_READ|TD_FILE_WRITE|TD_FILE_AUTO_DEL);
+    if (NULL == pCtx->cacheFileFd.fd) {
+      return TAOS_SYSTEM_ERROR(errno);
+    }
+    pCtx->cacheFileFdNum = 1;
+    taosThreadMutexInit(&pCtx->cacheFileFd.mutex, NULL);
+  } else {
+    taosThreadMutexLock(&pCtx->cacheFileFd.mutex);
+  }
+
+  *ppFd = &pCtx->cacheFileFd;
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t readBatchBlocksFromDisk(SGroupCacheOperatorInfo* pGCache, SGroupCacheData* pGrp, SGcBlkBufBasic* pBasic, void** ppBuf) {
+  TdFilePtr cacheFileFd = NULL;
+  SGcDownstreamCtx* pCtx = &pGCache->pDownstreams[pGrp->downstreamIdx];
+  int32_t code = acquireDownstreamFileFd(pCtx, &cacheFileFd);
+  if (code) {
+    return code;
+  }
+  int32_t ret = taosLSeekFile(cacheFileFd, pBasic->offset, SEEK_SET);
+  if (ret == -1) {
+    return TAOS_SYSTEM_ERROR(errno);
+  }
+
+  *ppBuf = taosMemoryMalloc(pBasic->bufSize);
+  if (NULL == *ppBuf) {
+    releaseDownstreamFileFd();
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+  
+  ret = (int32_t)taosReadFile(cacheFileFd, *ppBuf, pBasic->bufSize);
+  if (ret != pBasic->bufSize) {
+    taosMemoryFreeClear(*ppBuf);
+    return TAOS_SYSTEM_ERROR(errno);
+  }
+
+  releaseDownstreamFileFd();
+  return code;
+}
+
+
+static int32_t readSeqBlocksFromDisk(SGroupCacheOperatorInfo* pGCache, SGcBlkBufInfo* pHead) {
+  int32_t code = TSDB_CODE_SUCCESS;
+
+  SGroupCacheFileFd* pFd = NULL;
+  while (NULL != pHead) {
+    code = acquireVgroupFileFd(pGCache, pHead->pCtx, pHead->pGroup->pVgCtx, pHead->fileId, &pFd);
+    if (TSDB_CODE_SUCCESS != code) {
+      return code;
+    }
+
+    int32_t ret = taosLSeekFile(pFd->fd, pHead->basic.offset, SEEK_SET);
+    if (ret == -1) {
+      code= TAOS_SYSTEM_ERROR(errno);
+      return code;
+    }
+    
+    code = (int32_t)taosWriteFile(pFd->fd, pHead->pBuf, pHead->basic.bufSize);
+    releaseVgroupFileFd(pFd);
+    if (code != pHead->basic.bufSize) {
+      code= TAOS_SYSTEM_ERROR(errno);
+      return code;
+    }
+
+    taosWLockLatch(&pHead->pGroup->batchList.lock);
+    taosArrayPush(pHead->pGroup->batchList.pList, &pHead->basic);
+    taosWUnLockLatch(&pHead->pGroup->batchList.lock);
+
+    
+    int64_t blkId = pHead->basic.blkId;
+    pHead = pHead->next;
+    
+    taosHashRemove(pGCache->blkCache.pDirtyBlk, &blkId, sizeof(blkId));
+  }
+
+  return code;
+}
+
+
+static int32_t readBlockFromDisk(SGroupCacheOperatorInfo* pGCache, SGroupCacheData* pGrp, SGcBlkBufBasic* pBasic, void** ppRes) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  
+  if (pGCache->batchFetch) {
+    code = readBatchBlocksFromDisk(pGCache, pGrp, pBasic, ppRes);
+  } else {
+    code = readSeqBlocksFromDisk(pGCache, pGrp, pBasic, ppRes);
+  }
+
+  return code;
+}
+
+static int32_t retrieveBlkFromBufCache(SGroupCacheOperatorInfo* pGCache, SGroupCacheData* pGrp, int64_t sessionId, SGcBlkBufBasic* pBasic, SSDataBlock** ppRes) {
   int32_t code = TSDB_CODE_SUCCESS;
   SGcBlkCacheInfo* pCache = &pGCache->blkCache;
-  SGcBlkBufInfo bufInfo;
-  SGcBlkBufBasic* pBlkBasic = NULL;
   void* pBuf = NULL;
 
   taosRLockLatch(&pCache->dirtyLock);
-  SGcBlkBufInfo* pBufInfo = taosHashAcquire(pCache->pDirtyBlk, &blkId, sizeof(blkId));
+  SGcBlkBufInfo* pBufInfo = taosHashAcquire(pCache->pDirtyBlk, &pBasic->blkId, sizeof(pBasic->blkId));
   if (NULL == pBufInfo) {
-    code = readBlockFromDisk(pGCache, pGrp, blkId, nextOffset, &bufInfo.basic, &pBuf);
+    code = readBlockFromDisk(pGCache, pGrp, pBasic, &pBuf);
     if (code) {
       return code;
     }
-    pBlkBasic = &bufInfo.basic;
   } else {
-    pBlkBasic = &pBufInfo->basic;
     pBuf = pBufInfo->pBuf;
   }
   
@@ -358,8 +457,6 @@ static int32_t retrieveBlkFromBufCache(SGroupCacheOperatorInfo* pGCache, SGroupC
     return code;
   }
 
-  *nextOffset = pBlkBasic->offset + pBlkBasic->bufSize;
-
   taosHashPut(pCache->pReadBlk, &sessionId, sizeof(sessionId), ppRes, POINTER_BYTES);
   return TSDB_CODE_SUCCESS;
 }
@@ -594,26 +691,18 @@ static int32_t addNewGroupData(struct SOperatorInfo* pOperator, SOperatorParam*
   return TSDB_CODE_SUCCESS;
 }
 
-static int32_t addBlkToGroupCache(bool batchFetch, SGroupCacheData* pGroup, SGcBlkBufInfo* pNewBlk) {
-  if (batchFetch) {
-    taosWLockLatch(&pGroup->batchList.lock);
-    taosArrayPush(pGroup->batchList.pList, &pNewBlk->basic);
-    qError("block added to group cache, total block num:%" PRId64, (int64_t)taosArrayGetSize(pGroup->batchList.pList));
-    taosWUnLockLatch(&pGroup->batchList.lock);
-    return TSDB_CODE_SUCCESS;
-  }
-
+static int32_t addBlkToGroupCache(bool batchFetch, SGroupCacheData* pGroup, SGcBlkBufInfo* pNewBlk, int32_t* pIdx) {
   taosWLockLatch(&pGroup->batchList.lock);
-  
-  if (pGroup->seqList.endBlkId > 0) {
-    atomic_store_64(&pGroup->seqList.endBlkId, pNewBlk->blkId);
+  if (batchFetch) {
+    taosArrayPush(pGroup->batchList.pList, &pNewBlk->basic);
   } else {
-    atomic_store_64(&pGroup->seqList.startBlkId, pNewBlk->blkId);
-    atomic_store_64(&pGroup->seqList.endBlkId, pNewBlk->blkId);
+    taosArrayPush(pGroup->batchList.pList, &pNewBlk->basic.offset);
   }
 
-  qError("block added to group cache, total block num:%" PRId64, pGroup->seqList.endBlkId - pGroup->seqList.startBlkId + 1);
-
+  *pIdx = taosArrayGetSize(pGroup->batchList.pList) - 1;
+  
+  qError("block added to group cache, total block num:%" PRId64, (int64_t)taosArrayGetSize(pGroup->batchList.pList));
+  taosWUnLockLatch(&pGroup->batchList.lock);
   return TSDB_CODE_SUCCESS;
 }
 
@@ -651,15 +740,15 @@ static int32_t handleGroupCacheRetrievedBlk(struct SOperatorInfo* pOperator, SSD
     return code;
   }
 
-  code = addBlkToGroupCache(pGCache->batchFetch, pGroup, &newBlkBuf);
+  int64_t blkIdx = 0;
+  code = addBlkToGroupCache(pGCache->batchFetch, pGroup, &newBlkBuf, &blkIdx);
   if (code) {
     return code;
   }
 
   notifyWaitingSessions(pGroup->waitQueue);
   if (pGroup == pSession->pGroupData) {
-    pSession->lastBlkId = newBlkBuf.blkId;
-    pSession->nextOffset = newBlkBuf.offset + newBlkBuf.bufSize;
+    pSession->lastBlkId = blkIdx;
     
     *continueFetch = false;
   }
@@ -746,40 +835,25 @@ static int32_t getBlkFromSessionCacheImpl(struct SOperatorInfo* pOperator, int64
   SGroupCacheOperatorInfo* pGCache = pOperator->info;
   *got = true;
   
-  if (pGCache->batchFetch) {
-    SGroupBatchBlkList* pBatchList = &pSession->pGroupData->batchList;
-    taosRLockLatch(&pBatchList->lock);
-    int64_t blkNum = taosArrayGetSize(pBatchList->pList);
-    if (pSession->lastBlkId < 0) {
-      if (blkNum > 0) {
-        SGcBlkBufBasic* pBasic = taosArrayGet(pBatchList->pList, 0);
-        taosRUnLockLatch(&pBatchList->lock);
-        code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, pBasic->blkId, &pSession->nextOffset, ppRes);
-        pSession->lastBlkId = 0;
-        return code;
-      }
-    } else if ((pSession->lastBlkId + 1) < blkNum) {
-      SGcBlkBufBasic* pBasic = taosArrayGet(pBatchList->pList, pSession->lastBlkId + 1);
+  SGroupBatchBlkList* pBatchList = &pSession->pGroupData->batchList;
+  taosRLockLatch(&pBatchList->lock);
+  int64_t blkNum = taosArrayGetSize(pBatchList->pList);
+  if (pSession->lastBlkId < 0) {
+    if (blkNum > 0) {
+      SGcBlkBufBasic* pBasic = taosArrayGet(pBatchList->pList, 0);
       taosRUnLockLatch(&pBatchList->lock);
-      code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, pBasic->blkId, &pSession->nextOffset, ppRes);
-      pSession->lastBlkId++;
+      code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, pBasic, ppRes);
+      pSession->lastBlkId = 0;
       return code;
     }
+  } else if ((pSession->lastBlkId + 1) < blkNum) {
+    SGcBlkBufBasic* pBasic = taosArrayGet(pBatchList->pList, pSession->lastBlkId + 1);
     taosRUnLockLatch(&pBatchList->lock);
-  } else {
-    if (pSession->lastBlkId < 0) {
-      int64_t startBlkId = atomic_load_64(&pSession->pGroupData->seqList.startBlkId);
-      if (startBlkId > 0) {
-        code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, startBlkId, &pSession->nextOffset, ppRes);
-        pSession->lastBlkId = startBlkId;
-        return code;
-      }
-    } else if (pSession->lastBlkId < atomic_load_64(&pSession->pGroupData->seqList.endBlkId)) {
-      code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, pSession->lastBlkId + 1, &pSession->nextOffset, ppRes);
-      pSession->lastBlkId++;
-      return code;
-    }
+    code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, pBasic, ppRes);
+    pSession->lastBlkId++;
+    return code;
   }
+  taosRUnLockLatch(&pBatchList->lock);
 
   if (atomic_load_8((int8_t*)&pSession->pGroupData->fetchDone)) {
     *ppRes = NULL;
@@ -897,7 +971,6 @@ static FORCE_INLINE void initGroupCacheSessionCtx(SGcSessionCtx* pSession, SGcOp
   pSession->downstreamIdx = pGcParam->downstreamIdx;
   pSession->pGroupData = pGroup;
   pSession->lastBlkId = -1;
-  pSession->nextOffset = 0;
 }
 
 static int32_t initGroupCacheSession(struct SOperatorInfo* pOperator, SOperatorParam* pParam, SGcSessionCtx** ppSession) {